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Spawn ants on sand surface in side view mode

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Add VIEW_MODE_SIDE define to common shader defines so shaders can
branch on view mode via preprocessor. In side view, ants init by
scanning downward from the top to find the first non-air cell, then
spawn one pixel above it facing downward. Top view keeps the original
center spawn with random angle.
This commit is contained in:
Jared Miller 2026-03-11 14:27:24 -04:00
parent e89ee1afa2
commit cd8a4ade82
Signed by: shmup
GPG key ID: 22B5C6D66A38B06C
2 changed files with 18 additions and 0 deletions
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2
src/Renderer.ts
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@ -23,6 +23,7 @@ import {
BEHAVIOR_SOLID,
} from "./materials/types";
import { getBlockOffset } from "./sand/margolus";
import { generateSideViewWorld } from "./WorldInit";
interface Resources {
worldRenderTarget: THREE.WebGLRenderTarget;
@ -314,6 +315,7 @@ export default class Renderer {
Renderer.convertNumberToFloatString(BEHAVIOR_LIQUID),
BEHAVIOR_GAS: Renderer.convertNumberToFloatString(BEHAVIOR_GAS),
BEHAVIOR_SOLID: Renderer.convertNumberToFloatString(BEHAVIOR_SOLID),
VIEW_MODE_SIDE: Config.viewMode === "side" ? "1" : "0",
};
}

16
src/shaders/antsCompute.frag
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@ -95,8 +95,24 @@ void main() {
bool movementProcessed = false;
if (pos == vec2(0)) { // init new ant
#if VIEW_MODE_SIDE
// spawn on sand surface: random X, scan down from top to find first non-air cell
float spawnX = rand(vUv * 10000.);
float pixelSize = 1.0 / float(textureSize(tWorld, 0).x);
float surfaceY = 0.6; // fallback if scan finds nothing
for (float scanY = 1.0; scanY > 0.0; scanY -= pixelSize) {
float matId = texture(tWorld, vec2(spawnX, scanY)).x;
if (matId > 0.5) { // non-air cell found
surfaceY = scanY + pixelSize; // one cell above the surface
break;
}
}
pos = vec2(spawnX, surfaceY);
angle = -PI * 0.5; // face downward initially
#else
pos = vec2(0.5);
angle = rand(vUv * 10000.) * 2. * PI;
#endif
isCarrying = 0.;
storage = 0.;
personality = rand(vUv * 42069.); // 0.0 = pure follower, 1.0 = pure explorer