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Fix for mirrored transforms in FBX models

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extractScale will now return negative scale for left-handed matrices.
This commit is contained in:
Anthony J. Thibault 2015-12-02 16:55:04 -08:00
parent 744da64c50
commit b56cf58e33
1 changed files with 8 additions and 1 deletions
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9
libraries/shared/src/GLMHelpers.cpp
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@ -285,7 +285,14 @@ glm::quat glmExtractRotation(const glm::mat4& matrix) {
}
glm::vec3 extractScale(const glm::mat4& matrix) {
return glm::vec3(glm::length(matrix[0]), glm::length(matrix[1]), glm::length(matrix[2]));
glm::mat3 m(matrix);
float det = glm::determinant(m);
if (det < 0) {
// left handed matrix, flip sign to compensate.
return glm::vec3(-glm::length(m[0]), glm::length(m[1]), glm::length(m[2]));
} else {
return glm::vec3(glm::length(m[0]), glm::length(m[1]), glm::length(m[2]));
}
}
float extractUniformScale(const glm::mat4& matrix) {