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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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test/t_slope_belt_art.js
+20
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@@ -97,4 +97,24 @@ check('drawing leaves the seed, cells and saved block data unchanged', run(`(()
}
return snapshot() === before;
})()`));
for (const grade of [-1,1]) {
flatWorld(run,160,120,112);
run(`for(let k=0;k<6;k++)placeBlock(${grade<0?'BP_BELT_UP':'BP_BELT_DOWN'},1,12+k,${grade<0?20:12}+k*${grade},true);`);
for(let phase=0;phase<8;phase++) {
run(`rebuildPower();slopePhase.fill(${phase});slopeCleatsTick(false);prepareSlopeBelts(0,0,W,H);`);
check(`grade ${grade} phase ${phase} draws exactly the physical cleat raster`,run(`(()=>{
let drawn=0;
for(let i=0;i<N;i++){const x=i%W,y=(i/W)|0,detail=slopeDetailAt(i,x,y);if(detail===1)drawn++;
if((detail===1)!==Boolean(cleatMask[i] && !part[i] && !occ[i] && !mach[i] && (mat[i]===EMPTY || PH[mat[i]]===PH_GAS)))return false;
}return drawn>0;
})()`));
}
}
flatWorld(run,160,120,112);
run('placeBlock(BP_FILTER_DOWN,128,12,12,true);tick=0;prepareSlopeBelts(0,0,W,H);var idleJoins=slopeBeltJoins[12*BW+12];tick=2;prepareSlopeBelts(0,0,W,H);');
check('empty screen has a stable frame',run('slopeBeltJoins[12*BW+12]===idleJoins'));
run('setCell(47*W+48,SAND,20,0);prepareSlopeBelts(0,0,W,H);');
check('loaded screen shakes the frame with the simulation tick',run('(slopeBeltJoins[12*BW+12]&64)!==0'));
run('tick=4;prepareSlopeBelts(0,0,W,H);');
check('loaded frame returns on the next shake beat',run('(slopeBeltJoins[12*BW+12]&64)===0'));
done();