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Fix for normal selection with degenerate triangles.

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This commit is contained in:
Andrzej Kapolka 2015-01-21 12:28:05 -08:00
parent b8f97ca978
commit 87e3339791
1 changed files with 14 additions and 12 deletions

26
interface/src/MetavoxelSystem.cpp
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@ -1498,6 +1498,17 @@ const NormalIndex& IndexVector::get(int y) const {
return (relative >= 0 && relative < size()) ? at(relative) : invalidIndex;
}
static inline glm::vec3 getNormal(const QVector<VoxelPoint>& vertices, const NormalIndex& i0,
const NormalIndex& i1, const NormalIndex& i2, const NormalIndex& i3) {
// check both triangles in case one is degenerate
const glm::vec3& v0 = vertices.at(i0.indices[0]).vertex;
glm::vec3 normal = glm::cross(vertices.at(i1.indices[0]).vertex - v0, vertices.at(i2.indices[0]).vertex - v0);
if (glm::length(normal) > EPSILON) {
return normal;
}
return glm::cross(vertices.at(i2.indices[0]).vertex - v0, vertices.at(i3.indices[0]).vertex - v0);
}
void HeightfieldNodeRenderer::render(const HeightfieldNodePointer& node, const glm::vec3& translation,
const glm::quat& rotation, const glm::vec3& scale, bool cursor) {
if (!node->getHeight()) {
@ -2174,10 +2185,7 @@ void HeightfieldNodeRenderer::render(const HeightfieldNodePointer& node, const g
quadIndices.insert(qRgb(reclampedX, y - 1, reclampedZ - 1), indices.size());
quadIndices.insert(qRgb(reclampedX, y, reclampedZ - 1), indices.size());
}
const glm::vec3& first = vertices.at(index.indices[0]).vertex;
glm::vec3 normal = glm::cross(vertices.at(index1.indices[0]).vertex - first,
vertices.at(index3.indices[0]).vertex - first);
glm::vec3 normal = getNormal(vertices, index, index1, index2, index3);
if (alpha0 == 0) { // quad faces negative x
indices.append(index3.getClosestIndex(normal = -normal, vertices));
indices.append(index2.getClosestIndex(normal, vertices));
@ -2206,10 +2214,7 @@ void HeightfieldNodeRenderer::render(const HeightfieldNodePointer& node, const g
if (reclampedZ > 0) {
quadIndices.insert(qRgb(reclampedX, y, reclampedZ - 1), indices.size());
}
const glm::vec3& first = vertices.at(index.indices[0]).vertex;
glm::vec3 normal = glm::cross(vertices.at(index3.indices[0]).vertex - first,
vertices.at(index1.indices[0]).vertex - first);
glm::vec3 normal = getNormal(vertices, index, index3, index2, index1);
if (alpha0 == 0) { // quad faces negative y
indices.append(index3.getClosestIndex(normal, vertices));
indices.append(index2.getClosestIndex(normal, vertices));
@ -2235,10 +2240,7 @@ void HeightfieldNodeRenderer::render(const HeightfieldNodePointer& node, const g
}
quadIndices.insert(qRgb(reclampedX, y - 1, reclampedZ), indices.size());
const glm::vec3& first = vertices.at(index.indices[0]).vertex;
glm::vec3 normal = glm::cross(vertices.at(index1.indices[0]).vertex - first,
vertices.at(index3.indices[0]).vertex - first);
glm::vec3 normal = getNormal(vertices, index, index1, index2, index3);
if (alpha0 == 0) { // quad faces negative z
indices.append(index1.getClosestIndex(normal, vertices));
indices.append(index2.getClosestIndex(normal, vertices));