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Working on QR decomposition.

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This commit is contained in:
Andrzej Kapolka 2014-09-26 13:43:28 -07:00
parent 7c1333dcb0
commit 3fe6e30632
1 changed files with 22 additions and 0 deletions
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22
interface/src/MetavoxelSystem.cpp
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@ -1850,6 +1850,28 @@ int VoxelAugmentVisitor::visit(MetavoxelInfo& info) {
}
normal = glm::normalize(normal);
center /= crossingCount;
// use a sequence of Givens rotations to perform a QR decomposition
// see http://www.cs.rice.edu/~jwarren/papers/techreport02408.pdf
glm::mat4 r(0.0f);
glm::vec4 bottom;
for (int i = 0; i < crossingCount; i++) {
const EdgeCrossing& crossing = crossings[i];
bottom = glm::vec4(crossing.normal, glm::dot(crossing.normal, crossing.point));
for (int j = 0; j < 4; j++) {
float angle = glm::atan(-bottom[j], r[j][j]);
float sina = glm::sin(angle);
float cosa = glm::cos(angle);
for (int k = 0; k < 4; k++) {
float tmp = bottom[k];
bottom[k] = sina * r[k][j] + cosa * tmp;
r[k][j] = cosa * r[k][j] - sina * tmp;
}
}
}
if (totalWeight > 0.0f) {
materialWeights *= (EIGHT_BIT_MAXIMUM / totalWeight);
}