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Geometry viewer: tetra face-centre probe arrow ends on the face, not the cube corner #60

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Merged
ThinkOffApp merged 1 commit into from
Sep 7, 2026
Merged

Geometry viewer: tetra face-centre probe arrow ends on the face, not the cube corner #60

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18 changes: 11 additions & 7 deletions tools/geometry_viewer.html
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Original file line number Diff line number Diff line change
Expand Up @@ -582,13 +582,17 @@
// vertex (1,1,-1) = toward Q2(d,d,0); edge midpoint (1,0,0) =
// Q2-Q3 edge; face center (1,1,1) = Q2Q3Q4 face.
if (symStepVal >= 3) {
const arrowLen = D / 2;
// Vertex direction: (1,1,-1)
scene.add(makeLine(tetCenter, [tetCenter[0] + arrowLen, tetCenter[1] + arrowLen, tetCenter[2] - arrowLen], 0xff4444, 2));
// Edge midpoint: (1,0,0)
scene.add(makeLine(tetCenter, [tetCenter[0] + arrowLen, tetCenter[1], tetCenter[2]], 0x44ff44, 2));
// Face center: (1,1,1)
scene.add(makeLine(tetCenter, [tetCenter[0] + arrowLen, tetCenter[1] + arrowLen, tetCenter[2] + arrowLen], 0x4444ff, 2));
// Each probe arrow ends ON the feature it names (petrus, Sep 7 2026:
// the blue one overshot to the cube corner (D,D,D), three times past
// the face centre, while red and green ended on their features).
const half = D / 2;
// Vertex direction (1,1,-1): tip = Q2(d,d,0)
scene.add(makeLine(tetCenter, [tetCenter[0] + half, tetCenter[1] + half, tetCenter[2] - half], 0xff4444, 2));
// Edge midpoint direction (1,0,0): tip = midpoint of Q2-Q3 = (d, d/2, d/2)
scene.add(makeLine(tetCenter, [tetCenter[0] + half, tetCenter[1], tetCenter[2]], 0x44ff44, 2));
// Face centre direction (1,1,1): tip = centroid of Q2Q3Q4 = (2d/3, 2d/3, 2d/3)
const faceStep = D / 6;
scene.add(makeLine(tetCenter, [tetCenter[0] + faceStep, tetCenter[1] + faceStep, tetCenter[2] + faceStep], 0x4444ff, 2));
}

return { scene, count: keptCount, outsideKept, total: totalCount, target: new THREE.Vector3(D / 2, D / 2, D / 2), stepLabel: stepLabels[symStepVal] };
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