The Duke Nukem 3D Informational Suite by Ryan Lennox

Mapster32 Keys

This is a complete listing of the available keypresses and their respective functions within the Mapster32 editor. When I say "complete", what I actually mean is "perpetually outdated".

2D mode

General

Keypress	Function
`Escape`	Displays menu : (`N`)ew, (`L`)oad, (`S`)ave, save (`A`)s, and (`Q`)uit.
`Keypad Enter`	Switch to 3D mode.
`Right Shift`	Selects a group of vertices and/or sprites which you can drag around with the `Left Mouse Button`. The selected sprite(s) can be duplicated and stamped (copied) using `Insert`, after which they can be dragged off of the originals as a group, or individually, depending on whether or not they are still highlighted (as a minor technicality, it is actually the originals which are being dragged away, while the copies stay in place). Also note that highlighting multiple sprites allows you to change their elevation (with `PGUP` or `PGDN`) in 3D mode as if they were a combined unit. Note that `Right Shift` highlighting will only stay active for one cycle to 3D mode. After cycling back to 2D mode it disables itself. It can also be manually disabled by pressing `Right Shift` again in 2D mode. Mapster32 has the ability to copy several independent objects at once. Holding `Apostrophe ( ' )` while highlighting an object will add it to the current collection of highlighted objects (indicated by a small plus sign beside the selection box). Holding `Semicolon ( ; )` while highlighting an object will remove it from the current collection of highlighted objects (indicated by a small minus sign beside the selection box).
`Right Alt`	Selects a group of sectors (including the sprites) which can either be dragged around or duplicated. Use the `Left Mouse Button` to drag the sectors, or the `Insert` key to duplicate them. The duplicated sectors are pasted directly on top of the originals, and must be dragged off. After highlighting a group of sectors, you can load a different map and the highlighted sectors will appear in the loaded map (although you may encounter some problems with this feature, check the "References - FAQ" section for more information). Also note that highlighting multiple sectors allows you to shade them (with `Keypad +`/`-`), change their visibility (with `Alt + Keypad +`/`-`), or change their elevation (with `PGUP`/`PGDN`) in 3D mode as if they were a combined unit. The highlighted sprites will also be affected by the shading. Note that `Right Alt` highlighting stays active indefinitely, even after cycling between 3D mode and 2D mode. It must be manually disabled by pressing `Right Alt` again in 2D mode. Mapster32 has the ability to copy several independent objects at once. Holding `Apostrophe ( ' )` while highlighting an object will add it to the current collection of highlighted objects (indicated by a small plus sign beside the selection box). Holding `Semicolon ( ; )` while highlighting an object will remove it from the current collection of highlighted objects (indicated by a small minus sign beside the selection box).
`Enter`	Check pointers for highlighted sector (attempts to fix if corrupted).
`Arrow Keys`	Move player's position. The player will be clipped. Hold `Left Shift` to move faster. Holding `Right Ctrl` will cause the player to strafe rather than turn.
`Left Shift`	Displays the co-ordinates of the mouse cursor.
`Spacebar`	Plots vertices which are used to create sectors.
`Backspace`	Deletes the last vertex plotted. If continuously pressed, it will delete all of the previously plotted vertices until the sector no longer exists. In Mapster32, this key also has a separate function outside of sector drawing mode. It toggles between three different 2D display modes: textures disabled, textures enabled, and textures enabled with animation.
`Insert`	Inserts a new vertex on a highlighted line. If pressed when a group of sectors/sprites are highlighted, the sectors/sprites will be duplicated and stamped (copied). (Note: In Mapster32, the `I` key can be used as an alternative for inserting vertices, and the `C` key can be used as an alternative for the copying function).
`Delete`	Deletes sprites. To delete a vertex, drag it onto one of its two neighbouring vertices. If two vertices occupy the same space, one of them will be deleted.
`J`	Used to join adjacent sectors (i.e. sectors sharing a line). Press `J` once with the mouse cursor inside the first sector, then `J` again with the mouse cursor inside the second sector. The two neighboring sectors will be joined. The combined sector will keep the attributes of the first sector. Mapster32 has a preventative warning to stop you from accidentally joining non-adjacent sectors (which would most likely corrupt the map).
`S`	Insert sprite at mouse cursor's current location. A sprite looks like a circle with a line protruding from its center in 2D mode. The sprite will be automatically textured with the most common sprite texture to appear in the map, or with the sprite texture currently stored in the buffer, if the stored object is a sprite (some of the copied sprite's attributes will also be reproduced). Pressing a key from `1` to `0` on the upper row of numbers prior to pressing `S` will make the inserted sprite's picnum (texture) be 1 to 10, respectively. This incredibly useful feature allows you to place the 10 special sprites at a much faster pace. I also noticed this feature assigns the sprites non-standard repeat values ([48,48] instead of [64,64]), probably to make them appear less cluttered in small spaces.
`B`	Activates a wall's blocking flag, or deactivates both its blocking and hitscan flags. Activates or deactivates a sprite's blocking and hitscan flags. A blocked wall or sprite will appear pink in 2D mode. Players cannot walk through blocked walls or sprites.
`C`	Changes the highlighted line into a semi-circle consisting of short line segments. Press `Keypad +` or `Keypad -` to increase or decrease the number of vertices in the semi-circle. Pressing `C` again cancels the operation, pressing `Spacebar` completes the operation. (Note: In Mapster32, this key also functions as an alternative to `Insert` when copying objects).
`I`	Inserts a new vertex on a highlighted line. (Mapster32 alternative key for `Insert`).
`E`	Expand/compress a sector's floor texture.
`,` / `.` (aka `<` / `>`)	Changes the angle of a sprite. If you highlighted a sector with `Right Alt`, then the selected sector will be rotated instead. Hold `Shift` to get a more precise angle.
`Tab`	Press `Tab` in a sector to display its attributes at the bottom of the screen. To clear it, press `Tab` in an empty area. Highlighted wall and sprite information is displayed automatically.
`Keypad 2`/`4`/`6`/`8`	If a sprite is selected, this will adjust its pixel repeats (size). This only seems to work on sprites which are either wall-aligned or floor-aligned. Otherwise, this will adjust the panning of the highlighted sector's floor texture. In either case, use in conjunction with `Keypad 5` to make the values align at multiples of 8 (speeds up the process).
`/`	Resets a sprite's pixel repeats (size). Resets a floor's panning, provided that the texture display mode (toggled with the `Backspace` key) is active, and no sprites are highlighted.
`L`	Toggles grid locking. Grid locking means that vertices will lock to the closest grid point when moved or placed. If the grid is turned off, the grid locking will be turned off. A red mouse cursor means grid locking is on, a white mouse cursor means grid locking is off.
`G`	Changes the grid resolution. The grid resolution cycles through this sequence: 1024 units, 512 units, 256 units (default), 128 units, 64 units, 32 units, 16 units, 8 units, autosize, OFF. Autosize mode adjusts the grid resolution relative to the current zoom level. The further you zoom in, the higher the resolution and vice versa.
`A` / `Z`	Zooms in and out respectively.
`O`	Causes a sprite to travel in the direction exactly opposite its angle until it connects with a wall (any wall, including two-sided walls). Once it has reached a wall, the sprite's angle is adjusted to be orthogonal (perpendicular) to the wall. This is handy for placing wall-aligned sprites directly on a wall, and especially handy for moving SectorEffectors directly onto a sector's first wall.
`P`	Enter highlighted sector's floor and/or ceiling palette. The floor palette will affect all sprites within the sector (including wall-aligned sprites).
`R`	Sets sprite relative alignment mode. Switches between face-alignment (sprite always faces the player), wall-alignment, and floor-alignment.
`M`	Set the 'extra' value of a sector. This is a reserved value which is -1 by default.
`X` / `Y`	Flip the selected sectors on their x or y axis respectively. Use either key in conjunction with `Alt` instead to create a mirror image of the original sectors.
`Scroll Lock`	Sets the current camera position as the default player start position (represented by a coloured arrow). Your co-ordinates, height, and angle will be saved.

Function Keys

Keypress	Function
`F1`	Displays the help menu.
`F4`	Toggle 'first wall' highlighting.
`F5`	Displays map statistics.
`F6`	If a sprite is highlighted, it will display a SectorEffector help chart. If no sprite is highlighted, it will display the actor status and the next free tag number.
`F7`	If the cursor is in a sector, this will display a menu which can be used to edit the sector data.
`F8`	If the cursor is highlighting a wall or sprite, this will display a menu which can be used to edit the wall/sprite data.
`Alt + F7`	Search for a sector via Lo-Tag value. Use `]` to search forward and `[` to search backward.
`Alt + F8`	If a wall is highlighted, starts a wall search via tag values. If a sprite is highlighted, brings up a sprite search menu. In either case, use `]` to search forward and `[` to search backward.
`F9`	Displays a Sector Tags help chart.
`F12`	Takes a screenshot and saves it to a file (`capt####.TGA` (default) or `capt####.PCX`). Hold `Shift` for an inverted screenshot. The output file format (`TGA`/`PCX`) is configurable via the `r_scrcaptureformat` console command (whether in the game or map editor).

Simultaneous

Keypress	Function
`Ctrl + S`	Saves map.
`Ctrl + L`	Loads the last saved map.
`Ctrl + P`	Playtest map from current position.
`Ctrl + Alt + P`	Playtest map from starting position.
`Ctrl + X`	Quick-cycle through `MAP` files.
`Ctrl + Shift + X`	Quick-cycle through `MAP` files backwards.
`Ctrl + Z`	Undo the most recent mapping operations sequentially in reverse order. Undo/Redo are relatively new features, and as such are unstable. These keypresses may change at a later date.
`Ctrl + Shift + Z`	Redo the most recent Undone mapping operations sequentially in reverse order. Undo/Redo are relatively new features, and as such are unstable. These keypresses may change at a later date.
`Ctrl + N`	Toggles sprite clipping through floors/ceilings.
`Ctrl + Right Shift`	Highlight a wall and use this key combination to select all the vertices of the sector, which can then be dragged around. Use the `Left Mouse Button` to drag the sector. Note that all nested sectors and sprites within the sector will remain stationary (this is what differentiates this function from `Right Shift`). Note that `Right Shift` highlighting will only stay active for one cycle to 3D mode. After cycling back to 2D mode it disables itself. It can also be manually disabled by pressing `Right Shift` again in 2D mode.
`Ctrl + H`	Toggles hitscan of wall. Hitscanned objects will appear thick in 2D mode.
`Ctrl + Shift + H`	Toggles one-sided hitscan of wall. Hitscanned objects will appear thick in 2D mode.
`Ctrl + T`	Toggles tag boxes.
`Ctrl + Tab`	This used to have the same function as `Tab` for walls and sprites, but it has been made obsolete since highlighted walls and sprites now display information automatically. In ancient times (the Build era), this key combination was `Alt + Tab`, because apparently somebody didn't think this Windows thing would ever catch on.
`Ctrl + Delete`	Deletes the entire sector which the mouse cursor is in. This function used to work only with the `Right Ctrl` key for protection, but in Mapster32 it works with both keys. Check the "References - FAQ" section for more information about deleting sectors.
`Shift + B`	Toggles one-sided blocking of wall.
`Shift + G`	Cycles through the grid resolutions in reverse.
`Shift + /`	Sets xrepeat to yrepeat (squares the dimensions). Only works on sprites.
`Ctrl + Shift + Enter`	Check all pointers. Attempts to fix corrupted pointers in a map. While this might technically fix the corruption, it often breaks the map visually, so I don't recommend using it.
`Alt + F`	Sets highlighted wall as that sector's first wall. The first wall is the axis line for slopes. Make sure the mouse cursor is on the proper side of the wall before pressing `Alt + F` (this is important for two-sided walls especially, as each side has different attributes).
`Alt + M`	Set the 'extra' value of walls or sprites. This is a reserved value which is -1 by default.
`Alt + S`	Place the mouse cursor within an inner loop, make sure that an inner wall of the loop is highlighted (flashing), and press `Alt + S` to turn it into a nested sector (valid player space).
`Alt + [` / `Alt + ]`	Search for the previous or next map corruption respectively. The `corruptcheck now` and `corruptcheck tryfix [num]` console commands can be used in the map editor to attempt to fix map corruptions.
`Apostrophe ( ' ) + 3`	Toggles tag display (7 settings).
`Apostrophe ( ' ) + 7`	Swap the tag values of the highlighted wall or sprite. This comes in handy when you've accidentally entered the tags in reverse order.
`Apostrophe ( ' ) + A`	Toggles Autosave, which is a highly annoying and worthless feature (and it's always enabled by default). The default interval is 3 minutes, but this is adjustable in the `mapster32.cfg` file. To permanently disable it, find this line in your `mapster32.cfg` file: `autosavesec = <value>` and change the value to 0.
`Apostrophe ( ' ) + F`	Accesses a 'Special Functions' menu which contains the following useful functions: "Replace invalid tiles" "Delete all spr of tile #" "Set map sky shade" "Set map sky height" "Global Z coord shift" "Resize selection" "Global shade divide" "Global visibility divide"
`Apostrophe ( ' ) + J`	Jump to specific x/y co-ordinates.
`Apostrophe ( ' ) + L`	Set wall or sprite co-ordinates.
`Apostrophe ( ' ) + M`	This used to display the memory status in Build (which would crash if you tried to switch to 3D mode after using this key), but this seems to have been disabled in Mapster32.
`Apostrophe ( ' ) + N`	Cycles through the available clipping modes: "clipping enabled", "clipping non-masks only", and "clipping disabled". The first mode is the default, the second mode will allow the camera to move through blocked masked walls, and the third mode will allow the camera to move through all blocked objects, including the floor and ceiling! This is an extremely useful function, although it may be prone to crashing the program.
`Apostrophe ( ' ) + S`	Adjust a sprite's size values.

Hi-Tags/Lo-Tags

Mapster32 has a "smart-tagging" feature which allows you to type custom labels instead of numerical values. This only affects "channel" fields specifically. As soon as an alphabetical character is typed into a channel field, it triggers label-entry mode. Once in this mode, a label can consist of alphanumeric characters and/or special characters; Even a raw numerical value will be interpreted as a label! Thus, if you change your mind and want to use a numerical value instead, you must first press Escape to exit label-entry mode and return to numerical-entry mode. The labels are not shown if you modify the tags again, but are always displayed next to the numerical values in 2D mode. When the map is saved, a file called <mapname>.maptags is created to keep track of the labels (this avoids saving them directly into the map format).

Keypress	Function
`T`	Used to enter a sector Lo-Tag. Place the mouse cursor inside the sector first.
`Alt + T`	Has the same function as `T`, except used for walls and sprites. Highlight the object with the mouse cursor first.
`H`	Used to enter a sector Hi-Tag. Place the mouse cursor inside the sector first.
`Alt + H`	Has the same function as `H`, except used for walls and sprites. Highlight the object with the mouse cursor first.

Mouse

Buttonpress	Function
`Mouse`	Moves the cursor.
`Left Mouse Button`	Hold to drag vertices, sprites, or copied sectors.
`Right Mouse Button`	Hold to lock the camera to the mouse cursor's position. Useful for getting to sectors which are difficult to access in 3D mode.
`Mouse Wheel`	Adjust camera zoom level.
`Middle Mouse Button`	Hold to lock the camera to the mouse cursor's position (same as `Right Mouse Button`).
`Right Shift`	Use this in combination with the mouse to highlight vertices/sprites for mouse dragging.
`Right Alt`	Use this in combination with the mouse to highlight sectors for mouse dragging.
`Ctrl + Right Mouse Button`	If the cursor is in a sector and is not highlighting any walls or sprites, this will display a menu which can be used to edit the sector data. If the cursor is highlighting a wall or sprite, this will display a menu used to edit the wall/sprite data. Essentially this is a combination of the `F7`/`F8` functions.
`Alt + Mouse Wheel`	Jump to new camera position in response to mouse movements while adjusting the zoom simultaneously. This is absolutely useless since you can achieve the same effect in a smoother fashion by using the `Right Mouse Button` instead of `Alt`.

3D mode

General

Keypress	Function
`Escape`	Asks if you'd like to quit (Y/N). Also asks if you want to save your changes to the map.
`Keypad Enter`	Switch to 2D mode.
`Arrow Keys`	Move player's position. The player will be clipped. Hold `Left Shift` to move faster. Holding `Right Ctrl` will cause the player to strafe rather than turn.
`A` / `Z`	Moves the camera up and down respectively. Hold `Left Shift` to move faster. Hold `Ctrl` to aim down and up instead (the directions will be inverted).
`Caps Lock` / `Apostrophe ( ' ) + Z`	Switches between three z co-ordinate modes: Gravity Mode, Height Lock mode, and Float mode (default). `A` and `Z` move vertically up and down for all three.
`PGUP` / `PGDN`	Changes an object's elevation (floors, ceilings, or sprites). If a wall is highlighted, then the ceiling of that sector will move. There are a few modifier keys that can be used with this function. Holding `Ctrl` will make floors and ceilings move four times as fast. When used on sprites it will position them directly on the floor or ceiling. Holding `End` will make objects move at half increments, and holding `Home` will make objects move at quarter increments. If you highlight multiple sectors in 2D mode, then switch back to 3D mode, you can adjust multiple floors and ceilings.
`V`	This will activate tile selection mode. Press `V` on the texture you would like to change. An image list of all the textures currently being used in the map for the currently highlighted object type (floor/ceiling, solid wall, masked wall, or sprite) will be displayed. The textures are listed by number of instances in the map, in descending order (from most common to least common). See "Tile Selection Mode" further below for a full list of keypresses.
`Keypad 2`/`4`/`6`/`8`	This adjusts the repeats of the pixel columns/rows (effectively smooshes them together, or spreads them apart). Used on walls or sprites. If used on the floor or ceiling, they will be panned instead. Hold `Shift` to use the same panning functionality on walls. In any of these cases, use in conjunction with `Keypad 5` to make the values align at multiples of 8 (speeds up the process).
`Keypad +`/`-`	Adjust the shade of currently highlighted object. Floor shade affects all sprites within the sector (except wall-aligned sprites), unless the ceiling of the sector is parallaxed, in which case sprites within the sector will ignore the floor's shade and take on the ceiling's shade instead (except wall-aligned sprites).
`=` / `-` (aka `+`/`-`)	Cycle through textures for currently highlighted object. If used on a wall, this will only affect the texture on the highlighted side of the wall.
`/`	Resets a sprite's pixel repeats (size). Resets a wall's panning, pixel repeats (size), and cstat flags (only the highlighted side is affected). Two-sided (red) walls must be masked in order to be highlighted. Resets a floor's/ceiling's panning and flattens its slope.
`.`	The period key adjusts the panning and yrepeat values of all the walls in a loop. It scans along the walls to the right as long as the picture number is the same as the last wall. It basically "straightens" up your walls to make them look neater.
`F`	Flips textures. For sprites and walls, the textures are flipped in up to four different ways (none, x-wise, y-wise, or x+y). For ceilings and floors, the textures can be flipped up to eight different ways (all of the possible combinations of none, x-wise, y-wise, and x/y axes swapping). Just keep pressing `F` to see the variations.
`S`	Insert sprite at mouse cursor's current location. If aimed at the floor/ceiling, the sprite will appear directly on the floor/ceiling, and its relative alignment will be set as face-aligned. If aimed at a wall, the sprite will appear directly on the wall, and its relative alignment will be set as wall-aligned. The sprite will be automatically textured with the most common sprite texture to appear in the map, or with the sprite texture currently stored in the buffer, if the stored object is a sprite (some of the copied sprite's attributes will also be reproduced).
`G`	Set picnum (texture number) of highlighted object. If used on a wall, this will only affect the texture on the highlighted side of the wall.
`3`	Toggle floor-over-floor preview.
`Delete`	Deletes the highlighted sprite.
`,` / `.` (aka `<` / `>`)	Changes the angle of a sprite. Hold `Shift` to get a more precise angle.

Function Keys

Keypress	Function
`F1`	Displays the help menu.
`F2`	Toggles buffer texture (clipboard) display. Hold `Shift` to toggle the current tile display.
`F3`	Toggle mouselook.
`F4`	Toggle ambient sound preview.
`F5`	Toggle mouse navigation.
`F6`	Toggle automatic SectorEffector help.
`F7`	Toggle automatic Sector Tag help.
`F9`	Reload and activate maphacks.
`F10`	Disable maphacks.
`F11`	Gamma correction.
`F12`	Takes a screenshot and saves it to a file (`capt####.TGA` (default) or `capt####.PCX`). Hold `Shift` for an inverted screenshot. The output file format (`TGA`/`PCX`) is configurable via the in-game/map editor console's `r_scrcaptureformat` command.

Simultaneous

Keypress	Function
`Ctrl + S`	Saves map.
`Ctrl + L`	Loads the last saved map.
`Ctrl + P`	Playtest map from current position (this feature seems to have been removed from 3D mode).
`Ctrl + Alt + P`	Playtest map from starting position (this feature seems to have been removed from 3D mode).
`Ctrl + N`	Toggles sprite clipping through floors/ceilings.
`Alt + P`	Adjust an object's palette value (floors, ceilings, walls, or sprites). The floor palette will affect all sprites within the sector (including wall-aligned sprites).
`Alt + F`	Sets the sector's first wall. This can be set while highlighting either the wall itself, the floor just below it, or the ceiling just above it. It actually rotates the wall numbers of a sector. The first wall is used as the axis line for slopes. When you use relative alignment mode on ceiling and floor textures, you can press `Alt + F` to choose a new wall to align to.
`Alt + D`	Change a sprite's clipdist (clipping distance). This only works if the sprite's relative alignment is set to "face-alignment" (always faces the player). It does not work on all sprites. This is actually a very useful feature.
`Alt + [` / `Alt + ]`	Used to align a slope perfectly to the adjoining floor or ceiling respectively.
`Alt + Keypad +`/`-`	Adjusts sector visibility.
`Shift + Alt + Keypad +`/`-`	Adjusts sector visibility in smaller increments.
`Ctrl + Alt + Keypad +`/`-`	Adjusts the engine's base visibility (same as adjusting the `DEFAULTVISIBILITY` value in `USER.CON`). This does not affect the map, only the way it is displayed.
`Ctrl + T`	When highlighting a font sprite (alphanumeric or other font character), this brings up a text entry tool. This feature is simply amazing. The initial font sprite serves as a line marker and will shift down with each new line. Press `Enter` to start a new line. The fonts are configurable in the `tiles.cfg` file.
`Ctrl + A` / `Ctrl + Z`	Look down / Look up, respectively (note the inversion). Does not work while in the Gravity z co-ordinate mode.
`Ctrl + PGDN` / `Ctrl + PGUP`	Places a sprite exactly on the floor or ceiling, respectively. A sprite which is exactly on a floor or ceiling will stick to it as it moves vertically. If this key combination is used on a floor or ceiling, it will move four times as fast.
`Shift + /`	Sets xrepeat to yrepeat (squares the dimensions). Only works on sprites.
`Apostrophe ( ' ) + Delete`	Clear all cstat flags for a wall/sprite.
`Apostrophe ( ' ) + A`	Toggles Autosave, which is a highly annoying and worthless feature (and it's always enabled by default). The default interval is 3 minutes, but this is adjustable in the `mapster32.cfg` file. To permanently disable it, find this line in your `mapster32.cfg` file: `autosavesec = <value>` and change the value to 0.
`Apostrophe ( ' ) + C`	Changes the global shade of the highlighted object type (floor, ceiling, solid wall, or sprite) to the shade of the currently copied texture, provided that they are both the same texture. This function has no direct effect on overtiles (masked textures), but it will indirectly affect them if it adjusts the shade of the textures above/below them.
`Apostrophe ( ' ) + D`	Cycle actor skill level display.
`Apostrophe ( ' ) + I`	Enable a sprite's invisibility cstat flag. The sprite will become completely intangible, unless other cstat flags are also set (such as the blocking flag). Once a sprite is set as invisible, you will no longer be able to modify its attributes in 3D mode. If you want to modify its attributes, you will have to edit them manually in 2D mode with the `F8` key. If you want to make the sprite visible again, adjust its cstat value to remove the invisibility flag (the specific flag value is 32768). While you could do the math and subtract that amount from the cstat value, it's much easier to just set the cstat value to zero, and then reactivate whichever attributes you want the sprite to have in 3D mode.
`Apostrophe ( ' ) + L`	Set sector or sprite co-ordinates. In the case of sectors, the z co-ordinates and slope can be adjusted. For sprites, the x, y, and z co-ordinates and the angle can be adjusted.
`Apostrophe ( ' ) + M`	Set 'extra' value of highlighted object. This is a reserved value which is -1 by default.
`Apostrophe ( ' ) + N`	Cycles through the available clipping modes: "clipping enabled", "clipping non-masks only", and "clipping disabled". The first mode is the default, the second mode will allow the camera to move through blocked masked walls, and the third mode will allow the camera to move through all blocked objects, including the floor and ceiling! This is an extremely useful function, although it may be prone to crashing the program.
`Apostrophe ( ' ) + P`	Set palette of all sprites/walls/floors/ceilings (individually) in all selected sectors.
`Semicolon ( ; ) + P`	Set palette of all sprites/walls/floors/ceilings (globally) in all selected sectors.
`Apostrophe ( ' ) + R`	Toggles FPS (Frames Per Second) display.
`Apostrophe ( ' ) + S`	Insert a shade value for the highlighted object. Floor shade affects all sprites within the sector (except wall-aligned sprites), unless the ceiling of the sector is parallaxed, in which case sprites within the sector will ignore the floor's shade and take on the ceiling's shade instead (except wall-aligned sprites).
`Apostrophe ( ' ) + V`	Insert a value for the sector's visibility.
`Semicolon ( ; ) + V`	Set sector visibility for all selected sectors.
`Apostrophe ( ' ) + W`	Toggles sprite display (all sprites/no effectors/no actors/none).
`Apostrophe ( ' ) + X`	Toggle map shade preview, a very useful feature.
`Apostrophe ( ' ) + Y`	Display undefined textures as "purple" (looks more like pink) instead of causing the HOM (Hall Of Mirrors) glitch. Personally I think this feature should have been enabled by default.

Copying and Pasting

Keypress	Function
`Tab`	This copies the attributes of an object into a temporary buffer. The attributes it stores are: picnum (texture), shade, palette, cstat flags, tags, extra, panning, and pixel repeats. Aside from picnum, shade, and palette, the attributes can only be copied between objects of the same type (floor/ceiling, solid wall, masked wall, or sprite), and panning can only be copied between floors/ceilings.
`Enter`	This pastes the stored attributes over the highlighted object. If used on walls, the y-repeat value stays the same, and the x-repeat value is adjusted so the pixels of the bitmap have a square aspect ratio.
`Ctrl + Enter`	Pastes the picnum, shade, and palette attributes to every wall in a loop (if a wall is highlighted).
`Shift + Enter`	Pastes the shading/palette attributes only.
`Apostrophe ( ' ) + Enter`	Paste picnum only.
`Ctrl + Shift + Enter`	Auto-shades walls. First make any wall in a loop the lightest shade you want. Then make the last wall in the loop the darkest shade you want. Now place the mouse cursor over the wall that you want to be the lightest and press `Ctrl + Shift + Enter`.
`Alt + C`	Pastes the stored object texture globally. For example, if you wanted to replace all of the shotguns in your map with chainguns, you would simply copy the chaingun texture to the buffer with `Tab`, then highlight a sprite using the shotgun texture and press `Alt + C`. Every sprite in the map using that texture would be replaced with the stored texture! This is object-specific, meaning it will only affect the textures of the currently highlighted object type (floor, ceiling, solid wall, masked wall, or sprite), and it only affects the picnum (texture). No other attributes are modified. All of these traits combine to make this one of the most useful functions in the editor.

Sector (Ceiling/Floor) Flags

Keypress	Function
`[` / `]`	Slopes floors/ceilings up and down respectively. The sector's first wall is the axis line for slopes. Holding `Right Shift` slopes in smaller increments, and holding `Shift` slopes in the smallest increments.
`P`	Toggles parallaxing, which is basically a sky effect. Note that a parallaxed ceiling will cause sprites within the sector to ignore the floor's shade and take on the ceiling's shade instead. However, the floor will always have priority on a sprite's palette.
`E`	Expand/compress a ceiling or floor texture.
`R`	Toggles relative alignment mode for ceilings and floors. When you use relative alignment mode on ceiling and floor textures, you can press `Alt + F` to choose a new wall to align to.
`T`	In Mapster32, this key cycles through three different "Translucent Masked" floor/ceiling cstat flags, which are unused remnants of the engine. It is easy to accidentally assign these flags and then wonder why a floor/ceiling is so blurry.

Wall Flags

Keypress	Function
`B`	Toggles the blocking flag. Use `Shift + B` to toggle one-sided blocking.
`H`	Toggles hitscan flag (basically means 'hittable'). Allows a masked wall to be shot by bullets and other projectiles. Use `Shift + H` to toggle one-sided hitscan sensitivity.
`T`	Switches between three different modes of transparency: opaque, semi-transparent, and transparent.
`M`	Masks both sides of a two-sided wall. This can be set while highlighting either the floor just below where the two-sided wall would be, or the ceiling just above it. The texture will be the same on both sides, except it will be flipped x-wise.
`Shift + M`	Masks a two-sided wall on only one side. This type of one-sided masked wall will still be compatible with transparency settings and invisible (pink) pixels. Note that blocking/hitscan flags will affect both sides of a one-sided masked wall unless the `Shift` modifier key is used to set the flags.
`1`	Makes a 'solid' one-sided masked wall. This differs from `Shift + M` in that the wall will not be compatible with transparency settings or invisible (pink) pixels. This type of masked wall must be used to make mirrors. Note that blocking/hitscan flags will affect both sides of a one-sided masked wall unless the `Shift` modifier key is used to set the flags.
`2`	Allows the floor step and the ceiling step of a wall to be separately editable. Just press `2` on the top half of the wall. This feature isn't perfect, and it will cause shading problems if used with the light switch effect (bottom half of the wall will not respond). The walls will still share repeat values.
`O`	Wall orientation. Changes whether the texture aligns to the ceiling or floor.

Sprite Flags

Keypress	Function
`1`	Toggles one-sided sprites. This is only relevant for wall-aligned or floor-aligned sprites. Note that only the visible side will be blocked/hittable.
`B`	Sets the sprite as both Blocked and Hittable, or disables both if pressed again. A sprite with this attribute set will appear pink in 2D mode, and blue if it is disabled. Note that most 'active' sprites are automatically blocked and hittable in the game.
`H`	Toggles hitscan flag (basically means 'hittable'). The sprite will appear thick in 2D mode. Note that a sprite which is blocked will also be hittable regardless of the hitscan flag setting.
`C`	Toggles between "true-centering" and "foot-centering". With true-centering enabled, the sprite's elevation will be relative to its actual center. By default sprites are foot-centered.
`O`	Causes a sprite to travel in the direction exactly opposite its angle until it connects with a wall (any wall, including two-sided walls). Once it has reached a wall, the sprite's angle is adjusted to be orthogonal (perpendicular) to the wall. This is handy for placing wall-aligned sprites directly on a wall, and especially handy for moving SectorEffectors directly onto a sector's first wall.
`T`	Switches between three different modes of transparency: opaque, semi-transparent, and transparent.
`R`	Toggles relative alignment. Switches between face-alignment (sprite always faces the player), wall-alignment, and floor-alignment. Floor-alignment can cause some sprites ('actors' such as enemies, health, etc.) to malfunction in the game, and some sprites will also look meshed. As a general rule, only textures with dimensions which are powers of 2 will look proper in floor-alignment mode. For example, some compatible texture sizes would be 32x32, 64x128, 32x256, etc. Some incompatible texture sizes would be 13x17, 57x9, 21x55, etc.
`N`	Toggles the 'spritenoshade' flag. With this enabled, the sprite will not be affected by any sector shades. If the sprite has hard-coded cstat values, this flag will be overridden (and hence will not work). This flag only exists in Mapster32.

Hi-Tags/Lo-Tags

Keypress	Function
`Apostrophe ( ' ) + H`	Sets the Hi-Tag of the current object (wall/sprite/sector). Aim at the floor or ceiling to set the sector Hi-Tag.
`Apostrophe ( ' ) + T`	Sets the Lo-Tag of the current object (wall/sprite/sector). Aim at the floor or ceiling to set the sector Lo-Tag.

Tile Selection Mode

This mode is accessed by pressing the V key on a texture.

Keypress	Function
`V`	Display entire texture list.
`Arrow Keys`	Move selection cursor.
`PGUP` / `PGDN`	Move selection cursor by page increments.
`Keypad /`	Zoom in.
`Keypad * (asterisk)`	Zoom out.
`G`	Goto specific texture number (automatically skips to entire texture list if `V` was not pressed first).
`U`	Goto beginning of user defined art (#3584).
`A`	Goto beginning of Atomic edition art (#4096).
`E`	Goto beginning of extended art (#6144, #9216).
`Z`	Toggle texture zoom.
`T`	Select from predefined tilesets.
`Escape`	Cancel texture selection.
`Enter`	Accept texture selection.
`Mouse`	Move selection cursor.
`Mouse Wheel`	Scroll through textures.
`Right Mouse Button`	Smooth scrolling through textures.
`Ctrl + Mouse Wheel`	Adjust zoom level.
`Left Mouse Button`	Accept texture selection.

Mouse

Use F3 to toggle mouselook mode. Note that modifier keys, such as Ctrl, Shift, Alt, Home, End, are compatible with mouse functions just as they would be with keyboard functions. They can still be used when adjusting shading, visibility, elevation, etc.

Buttonpress	Function
`Mouse`	Moves the cursor.
`Left Mouse Button`	'Lock' the currently highlighted object. The object will stay selected regardless of the mouse cursor's position. This helps you move things up and down even when they've left your field of vision. This feature is extremely useful, to the point of being necessary for many tasks.
`Middle Mouse Button`	Mouselook mode.
`Mouse Wheel`	Adjust shade of object, or visibility of selected sectors.
`Alt + Mouse Wheel`	Adjust sector visibility.
`Left Mouse Button + Mouse Wheel`	Cycle through textures.
`Right Mouse Button + Mouse Wheel`	Adjust highlighted object's elevation with mouse wheel.
`Alt + Left Mouse Button`	Adjust highlighted object's elevation with mouse.
`Shift + Left Mouse Button`	When highlighting a ceiling, floor, or wall, this can be used to pan the texture. When highlighting a sprite, it can be used to adjust the position of the sprite along the horizontal plane (i.e. adjust it's x co-ordinates).
`Ctrl + Left Mouse Button`	Scale wall texture or sprite. Also changes the slope of a sector ceiling/floor.

Another new feature of Mapster32 is UnrealEd-style mouse navigation, which can be toggled with F5. This enables the following functions. The console variable 'pk_uedaccel' changes the navigation speed exponentially (valid values are 0-5).

`Right Mouse Button`	Mouselook mode.
`Left Mouse Button`	Mouse controlled movement. x-axis movements will turn the camera, y-axis movements will propel the camera forward/backward.
`Left Mouse Button + Right Mouse Button`	Mouse controlled movement. x-axis movements will strafe left/right, y-axis movements will change camera elevation.
`Middle Mouse Button`	Mouse controlled movement. x-axis is ignored, y-axis movements will move the camera in the direction of view.

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