New example models procedural decals - #6083
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A decal example that works on the web
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| // following the same clip-space projection idea used by engines' decal systems (and by | ||
| // three.js' DecalGeometry, which the technique is commonly traced back to). What's left | ||
| // after clipping becomes the decal's own small mesh, UV-mapped from its local coordinates | ||
| static Mesh GenMeshDecal(Model model, Matrix projection, float decalSize, float decalOffset) |
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| switch (total) | ||
| { | ||
| case 0: | ||
| // Whole triangle is inside this face, keep it as-is | ||
| AddTriangleToMeshBuilder(outMesh, inMesh->vertices[i], inMesh->vertices[i + 1], inMesh->vertices[i + 2]); | ||
| break; | ||
| case 1: | ||
| // One corner is outside; clip it off, turning the triangle into a quad | ||
| if (v1Out) | ||
| { | ||
| nV1 = inMesh->vertices[i + 1]; | ||
| nV2 = inMesh->vertices[i + 2]; | ||
| nV3 = ClipSegment(inMesh->vertices[i], nV1, planes[face], s); | ||
| nV4 = ClipSegment(inMesh->vertices[i], nV2, planes[face], s); | ||
| } | ||
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| if (v2Out) | ||
| { | ||
| nV1 = inMesh->vertices[i]; | ||
| nV2 = inMesh->vertices[i + 2]; | ||
| nV3 = ClipSegment(inMesh->vertices[i + 1], nV1, planes[face], s); | ||
| nV4 = ClipSegment(inMesh->vertices[i + 1], nV2, planes[face], s); | ||
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| AddTriangleToMeshBuilder(outMesh, nV3, nV2, nV1); | ||
| AddTriangleToMeshBuilder(outMesh, nV2, nV3, nV4); | ||
| break; | ||
| } | ||
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| if (v3Out) | ||
| { | ||
| nV1 = inMesh->vertices[i]; | ||
| nV2 = inMesh->vertices[i + 1]; | ||
| nV3 = ClipSegment(inMesh->vertices[i + 2], nV1, planes[face], s); | ||
| nV4 = ClipSegment(inMesh->vertices[i + 2], nV2, planes[face], s); | ||
| } | ||
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| AddTriangleToMeshBuilder(outMesh, nV1, nV2, nV3); | ||
| AddTriangleToMeshBuilder(outMesh, nV4, nV3, nV2); | ||
| break; | ||
| case 2: | ||
| // Two corners are outside; only the small corner near the surviving vertex remains | ||
| if (!v1Out) | ||
| { | ||
| nV1 = inMesh->vertices[i]; | ||
| nV2 = ClipSegment(nV1, inMesh->vertices[i + 1], planes[face], s); | ||
| nV3 = ClipSegment(nV1, inMesh->vertices[i + 2], planes[face], s); | ||
| AddTriangleToMeshBuilder(outMesh, nV1, nV2, nV3); | ||
| } | ||
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| if (!v2Out) | ||
| { | ||
| nV1 = inMesh->vertices[i + 1]; | ||
| nV2 = ClipSegment(nV1, inMesh->vertices[i + 2], planes[face], s); | ||
| nV3 = ClipSegment(nV1, inMesh->vertices[i], planes[face], s); | ||
| AddTriangleToMeshBuilder(outMesh, nV1, nV2, nV3); | ||
| } | ||
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| if (!v3Out) | ||
| { | ||
| nV1 = inMesh->vertices[i + 2]; | ||
| nV2 = ClipSegment(nV1, inMesh->vertices[i], planes[face], s); | ||
| nV3 = ClipSegment(nV1, inMesh->vertices[i + 1], planes[face], s); | ||
| AddTriangleToMeshBuilder(outMesh, nV1, nV2, nV3); | ||
| } | ||
| break; | ||
| default: | ||
| // All 3 corners are outside this face, the triangle is fully clipped away | ||
| break; | ||
| } |
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Example of decals that works on the web