shmup/ants
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Prevent ants from picking up the surface they walk on

Browse source 
Angle noise (±12° from wander) caused the ahead-cell pickup check
to sample into the sand cell directly below the ant. Ants were
grabbing sand on their first frame of existence.

Fix: skip powder pickup when the ahead cell equals the cell directly
below (the walking surface). Food pickup is still allowed from any
adjacent cell. Diagonal dig pickup still works since the DIG priority
angles ants at ~40° which targets a diagonal neighbor, not directly
below.
This commit is contained in:
Jared Miller 2026-03-12 10:16:14 -04:00
parent 328f8a76e2
commit 5d25218433
Signed by: shmup
GPG key ID: 22B5C6D66A38B06C
1 changed files with 15 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
src/shaders/antsCompute.frag
View file

@ -337,12 +337,18 @@ void main() {
float aheadMatId = texture(tWorld, aheadUv).x;
int aheadMatInt = int(aheadMatId);
// food: pick up from any adjacent cell
if (aheadMatInt == MAT_FOOD) {
isCarrying = 1.;
cargoMaterialId = aheadMatId;
angle += PI;
storage = getMaxScentStorage(vUv);
} else if (aheadMatInt != MAT_AIR && aheadMatInt != MAT_HOME) {
// powder: don't grab the surface we're walking on — only dig
// when facing diagonally into material (DIG priority angles us there)
vec2 belowCell = roundUvToCellCenter(pos - vec2(0., cellSize));
bool isWalkingSurface = all(equal(aheadUv, belowCell));
if (!isWalkingSurface) {
vec4 props = texelFetch(uMaterialProps, ivec2(aheadMatInt, 0), 0);
float behavior = props.r;
float hardness = props.b;
@ -354,6 +360,7 @@ void main() {
}
}
}
}
} // end !isFalling
FragColor = vec4(