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Optimize AnimPose(glm::mat) ctor

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This commit is contained in:
Brad Davis 2016-12-28 11:31:47 -08:00
parent dc75894293
commit 3431db548f
1 changed files with 7 additions and 1 deletions
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8
libraries/animation/src/AnimPose.cpp
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@ -18,11 +18,17 @@ const AnimPose AnimPose::identity = AnimPose(glm::vec3(1.0f),
glm::vec3(0.0f));
AnimPose::AnimPose(const glm::mat4& mat) : _dirty(false) {
static const float EPSILON = 0.0001f;
_mat = mat;
_scale = extractScale(mat);
// quat_cast doesn't work so well with scaled matrices, so cancel it out.
glm::mat4 tmp = glm::scale(mat, 1.0f / _scale);
_rot = glm::normalize(glm::quat_cast(tmp));
_rot = glm::quat_cast(tmp);
float lengthSquared = glm::length2(_rot);
if (glm::abs(lengthSquared - 1.0f) > EPSILON) {
float oneOverLength = 1.0f / sqrt(lengthSquared);
_rot = glm::quat(_rot.w * oneOverLength, _rot.x * oneOverLength, _rot.y * oneOverLength, _rot.z * oneOverLength);
}
_trans = extractTranslation(mat);
}