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Sloped belts hold their load with moving cleats (t42); sloped filters are downhill shaking screens (t43)

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The magic grip is gone: cleats every 8 face cells, 6 grains tall, carry
pockets uphill (about 71 grains/s against 90 flat) and overflow rolls
back. Sloped filters always run downhill; grains travel by gravity and
a shake, and sorting stays exact. Drawing needs another pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-26 19:47:59 -04:00
co-authored by Claude Opus 5.5
parent 1f8a89db6a
commit 578b55316b
28 changed files with 425 additions and 89 deletions
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src/sim/items.js
+4 -4
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@@ -134,12 +134,12 @@ function entDiagonalScrewTick(e, p) {
function entSlopeBeltTick(e) {
const bottom = e.iy + BAR_H;
if (bottom >= H) return false;
let d = 0, slope = false;
let d = 0, slope = false, screen = false;
for (let x = e.ix; x < e.ix + BAR_W; x++) {
const i = bottom * W + x, b = (bottom >> 2) * BW + (x >> 2), c = blockP[b];
if ((isBelt(c) || isFilter(c)) && entSolidCell(i)) {
d = isFilter(c) ? (blockV[b] & 128 ? 1 : -1) : (blockV[b] ? 1 : -1);
if (isSlopeBelt(c)) slope = true;
if (isSlopeBelt(c)) { slope = true; if (isFilter(c)) screen = true; }
}
}
if (!d) return false;
@@ -150,12 +150,12 @@ function entSlopeBeltTick(e) {
const b = (y >> 2) * BW + (x >> 2), c = blockP[b];
if (!(isBelt(c) || isFilter(c)) || (isFilter(c) && filterPassAt(e.m, y * W + x))) continue;
if (beltFaceY(c, x >> 2, y >> 2, x) !== y) continue;
if (isSlopeBelt(c)) slope = true;
if (isSlopeBelt(c)) { slope = true; if (isFilter(c)) screen = true; }
face = Math.min(face, y);
}
if (!slope) return false;
e.x = e.ix; e.y = e.iy; e.vx = e.vy = 0;
if (tick & 1) return true;
if (screen ? tick % SCREEN_NUDGE_TICKS : tick & 1) return true;
const y = face === H ? e.iy : face - BAR_H, x = e.ix + d;
if (entFreeAt(x, y)) { e.vx = d * 0.5; e.vy = (y - e.iy) * 0.5; e.x = e.ix = x; e.y = e.iy = y; stats.moved++; }
else if (!entScrewEnter(e, d, 0)) entScrewEnter(e, d, Math.sign(y - e.iy), true);