Copying an image to the system clipboard (Windows) and then clicking a button that reads the clipboard results in the following error:

Steps to reproduce:

1. Zoom out to 1:2^796
2. Move the mouse cursor onto the 3D octree render
3. Observe framerate drop

Rust 99.7%
GLSL 0.3%

• Github, 2020

find a way to rewrite GLSL in Rust.

It should advance the simulation by the step size and one generation respectively.

Zooming out beyond 2^31:1 breaks viewport interpolation. Zooming out beyond around 2^54:1 using the scroll wheel crashes the program.

Steps to reproduce:

1. Open NDCell
2. Do not resize the window
3. Zoom in all the way
4. Pan one pixel to the left

The rightmost vertical gridline disappears

Tentative notation

[ and ] represent literal characters. < and > do not.

• <turmite type>[<transitions per internal state>]
• <turmite type> is Turmite, AbsoluteTurmite, TriTurmite, or HexTurmite
• <transitions per internal state> is a |-separated list of <transitions per tile state>
• <transitions per tile state> is a ,-separated list of <transition>
• <transition> is <new tile state><directions>
• <new tile state> is a non-negative integers less than the number of tiles
• <directions> is a list of <direction> with no separator
  • If no directions are listed, the turmite disappears
  • If multiple directions are listed, the turmite is cloned
• <direction> is a relative or absolute direction (depending on the type of turmite) optionally followed by a 3D orientation change optionally followed by a new internal state, which is a non-negative integer less than the number of internal states

Relative directions

• F = forwards (no turn)
• B = backwards (180 turn left/right)
• L = left
• R = right
• U = up
• D = down

Absolute directions

• E = east
• W = west
• N = north
• S = south
• U = up
• D = down

3D orientation changes

• l = roll 90 degrees counterclockwise
• r = roll 90 degrees clockwise
• f = roll 180 degrees

Examples

• Langton's Ant: Turmite[1R,0L]
• Langton's LLRR Ant: Turmite[1R,2R,3L,0L]
• Highway 2074575: AbsoluteTurmite[1N1,1W0|0S1,1N1|1S3,1S2|0N2,0E1]

Other considerations

3D orientation may be determined by using the previous "forward" direction of the turmite as the new "up" direction.

It may be worth creating a more concise Ant[...] generator with limited capabilities.

See also:

• Softology Ant Automata

Currently there is a field, single_state: Option<u8> that holds None if the node contains more than one cell state value or Some(state) if all cells in the node have state state.

I'd like to retype this field to the enum:

enum CellsSummary {
    /// All cells have the same state.
    SingleState(u8),
    /// There is a mix of zero and nonzero cells; all nonzero cells have the same state.
    SingleNonzeroState(u8),
    /// There are multiple nonzero cell states.
    Mixed,
}

This will enable rendering while zoomed to can include colors even in sparsely populated regions.

Steps to reproduce:

1. Select some cells
2. Move the cells
3. Press Enter to start running the simulation
4. Ctrl+click to deselect, dropping the selected cells

Expected result: The selected cells are pasted and the simulation either stops or continues running

Actual result: The selected cells disappear

Steps to reproduce:

1. Draw a rectangle of cells from [-36, 47] to [-35, 40] (inclusive)
2. Select the rectangle of cells from [-36, 47] to [-35, 40] (inclusive)
3. Click and drag on the selection of cells to move them

This produces the following strange artifacts (the grid is empty except for the selection):

Steps to reproduce:

1. Create a 1x1 selection in 2D
2. Hold ctrl+shift to show selection resize preview
3. Move the mouse to the north and/or east of the selection

Expected behavior: resize preview is shown as expected, same as with 2x2 selection.

Actual behavior: resize preview does not extend beyond the northeast corner of the selection.

This behavior appears along each axis indepedently; e.g. a 1x2 selection is glitchy along one axis, but not the other.