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Grains riding a belt or filter cast no shadow (t37)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-25 20:04:44 -04:00
co-authored by Claude Opus 5.5
parent 8087c28cb5
commit f744d786f1
4 changed files with 64 additions and 4 deletions
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test/t_light.js
+44
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@@ -60,4 +60,48 @@ run(`SET.daylight = 0; temp[140 * W + 80] = 1500; computeLight();`);
check('hot material inside the base lights its surroundings', run('lightAt(R.lr, 88, 140) > 0.2'));
run(`temp[140 * W + 80] = AMB[140]; bot.x = 72; bot.y = 130; bot.lamp = true; computeLight();`);
check('the bot lamp still lights the base', run('lightAt(R.lr, 80, 140) > 0.2'));
flatWorld(run, 320, 200, 160);
run(`
SET.daylight = 1; bot.lamp = false;
for (let bx = 8; bx < 30; bx++) placeBlock(BP_BELT, 1, bx, 20, true);
for (let x = 32; x < 120; x++) for (let y = 77; y < 80; y++) setCell(y * W + x, SAND, AMB[y], 0);
for (let x = 180; x < 280; x++) {
setCell(80 * W + x, STONE, AMB[80], F_NAT);
for (let y = 77; y < 80; y++) setCell(y * W + x, SAND, AMB[y], 0);
}
updateRoof();
`);
for (const mode of ['full', 'fast']) {
run(`SET.lighting = '${mode}'; computeLight();`);
for (const channel of ['lr', 'lg', 'lb']) {
const [belt, open, stone] = run(`[lightAt(R.${channel}, 80, 84), lightAt(R.${channel}, 152, 84), lightAt(R.${channel}, 232, 84)]`);
check(`${mode} ${channel}: a loaded belt leaves daylight below it`, Math.abs(belt - open) < 1e-6, `${belt} / ${open}`);
check(`${mode} ${channel}: sand on natural stone still shades below`, stone < open * 0.95, `${stone} / ${open}`);
}
run('setCell(76 * W + 80, WATER, AMB[76], 0); updateRoof(); computeLight();');
const a = run('lightAt(R.latt, 80, 76)');
check(`${mode}: a wet belt load transmits like air`, Math.abs(a - Math.pow(0.978, mode === 'fast' ? 4 : 2)) < 1e-6, a);
run('setCell(76 * W + 80, EMPTY, AMB[76], 0); updateRoof();');
}
for (const [name, support, depth, gap, expected] of [
['left belt', 'mat[i] = BELTL', 12, '', true],
['right belt', 'mat[i] = BELTR', 12, '', true],
['filter', 'part[i] = P_FILTER', 12, '', true],
['deep heap', 'mat[i] = BELTR', 13, '', false],
['air gap', 'mat[i] = BELTR', 3, 'EMPTY', false],
['gas gap', 'mat[i] = BELTR', 3, 'STEAM', false],
['natural ledge', 'mat[i] = STONE; flags[i] = F_NAT', 3, '', false],
['wall floor', 'mat[i] = STONE', 3, '', false],
['tube', 'part[i] = P_TR', 3, '', false],
]) {
run(`
for (let y = 40; y <= 53; y++) { const i = y * W + 300; mat[i] = SAND; part[i] = 0; flags[i] = 0; }
{ const i = (40 + ${depth}) * W + 300; mat[i] = EMPTY; mat[i + W] = BELTR; ${support}; }
${gap ? `mat[41 * W + 300] = ${gap};` : ''}
`);
check(`${name}: belt load detection`, run('onBeltForLight(40 * W + 300)') === expected);
}
run('mat[(H - 1) * W + 300] = SAND;');
check('belt load detection stops at the world bottom', run('!onBeltForLight((H - 1) * W + 300)'));
done();