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Reapply "handel case when positions are quantized" 

This reverts commit bad1aa1d2a.
This commit is contained in:
danielzhong 2025-09-19 15:54:40 -04:00
parent bad1aa1d2a
commit 688a5a4e26
1 changed files with 18 additions and 1 deletions
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19
packages/engine/Source/Scene/Model/EdgeVisibilityPipelineStage.js
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@ -198,10 +198,27 @@ function buildTriangleAdjacency(primitive) {
VertexAttributeSemantic.POSITION,
);
const positions = defined(positionAttribute.typedArray)
// Retrieve raw (possibly quantized) position data. If the attribute is quantized
// we must dequantize on the CPU here because we compute face normals and silhouette
// classification data before the vertex shader's dequantization stage runs.
let positions = defined(positionAttribute.typedArray)
? positionAttribute.typedArray
: ModelReader.readAttributeAsTypedArray(positionAttribute);
const quantization = positionAttribute.quantization;
if (defined(quantization) && !quantization.octEncoded) {
const count = positions.length; // length is 3 * vertexCount
const dequantized = new Float32Array(count);
const offset = quantization.quantizedVolumeOffset;
const step = quantization.quantizedVolumeStepSize;
for (let i = 0; i < count; i += 3) {
dequantized[i] = offset.x + positions[i] * step.x;
dequantized[i + 1] = offset.y + positions[i + 1] * step.y;
dequantized[i + 2] = offset.z + positions[i + 2] * step.z;
}
positions = dequantized;
}
// Build edge map: key = "min,max", value = [triangleA, triangleB?]
const edgeMap = new Map();