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fix(editor): correct --gen-mesh-tent door fan triangulation

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The +X gable's door-fan was wrong: it emitted 5 triangles
including {b, c, br} which spanned across the door cutout
area, and left bl unreferenced. --info-mesh-stats caught
both — surface area was over-reported by 0.10 m^2 and one
triangle was degenerate.

Replace with the correct 4-triangle fan from R1 around the
six-vertex polygon B → bl → dt → br → C → R1 (the original
gable triangle minus the bl-br-dt door notch). All six
vertices are now referenced, no triangle covers the door
area, and surface area matches the visible canvas.
This commit is contained in:
Kelsi 2026-05-09 10:45:27 -07:00
parent f8bd4c70c8
commit afdf754c13
1 changed files with 12 additions and 13 deletions
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25
tools/editor/cli_gen_mesh.cpp
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@ -7127,28 +7127,27 @@ int handleTent(int& i, int argc, char** argv) {
}
// +X gable: B=(+L2,0,-W2), C=(+L2,0,+W2), R1=(+L2,H,0). Faces +X.
// If doorH>0 we carve out a tapered notch — bottom edge of width
// doorW, apex on the centerline at height doorH — and replace the
// single gable triangle with a 4-triangle fan around the door.
// doorW, apex on the centerline at height doorH. The remaining
// polygon (B → bl → dt → br → C → R1, going CCW from -X view to
// match the existing gable winding) is triangulated as a fan
// from R1: 4 triangles, no overlap with the door area, every
// vertex referenced by at least one triangle.
{
glm::vec3 n(+1, 0, 0);
if (doorH > 0 && doorW > 0) {
uint32_t r1 = addV({+L2, height, 0}, n, {0.5f, 1});
uint32_t b = addV({+L2, 0, -W2}, n, {0, 0});
uint32_t bl = addV({+L2, 0, -doorW * 0.5f}, n,
{0.5f - doorW / (2 * width), 0});
uint32_t dt = addV({+L2, doorH, 0}, n,
{0.5f, doorH / height});
uint32_t br = addV({+L2, 0, +doorW * 0.5f}, n,
{0.5f + doorW / (2 * width), 0});
uint32_t c = addV({+L2, 0, +W2}, n, {1, 0});
uint32_t r1 = addV({+L2, height, 0}, n, {0.5f, 1});
uint32_t dt = addV({+L2, doorH, 0}, n,
{0.5f, doorH / height});
// Slab right of the door, slab left of the door, then the
// peak triangle bridging door-top to ridge.
wom.indices.insert(wom.indices.end(), {b, c, br});
wom.indices.insert(wom.indices.end(), {b, br, dt});
wom.indices.insert(wom.indices.end(), {b, dt, r1});
wom.indices.insert(wom.indices.end(), {c, r1, dt});
wom.indices.insert(wom.indices.end(), {c, dt, br});
(void)bl; // left-base slot reserved for symmetric door variant
wom.indices.insert(wom.indices.end(), {r1, b, bl});
wom.indices.insert(wom.indices.end(), {r1, bl, dt});
wom.indices.insert(wom.indices.end(), {r1, dt, br});
wom.indices.insert(wom.indices.end(), {r1, br, c});
} else {
uint32_t b = addV({+L2, 0, -W2}, n, {0, 0});
uint32_t c = addV({+L2, 0, +W2}, n, {1, 0});