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speedup shadow clipping with progressive shadow generation

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This commit is contained in:
Stewart Allen 2022-04-07 10:36:58 -04:00
commit 0eb42ef03a
1 changed files with 15 additions and 2 deletions
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17
src/kiri-mode/cam/ops.js
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@ -946,13 +946,26 @@ class OpPocket extends CamOp {
return slice;
}
let shadows = {};
function genShadows(zs) {
let lastShadow, lastZ;
for (let z of zs) {
if (shadows[z]) continue;
let shadow = CAM.shadowAt(widget, z, lastZ);
lastZ = z;
if (lastShadow) {
shadow = POLY.union([...shadow, ...lastShadow], undefined, true);
}
lastShadow = shadow;
shadows[z] = shadow;
}
}
function clearZ(polys, z, down) {
let zs = down ? base.util.lerp(zTop, z, down) : [ z ];
let nested = POLY.nest(polys);
for (let poly of nested) {
genShadows(zs);
for (let z of zs) {
let shadow = shadows[z] || CAM.shadowAt(widget, z);
shadows[z] = shadow;
let shadow = shadows[z];
let clip = [];
POLY.subtract([poly], shadow, clip);
let slice = newSliceOut(z);