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Fix examples/glview rotations

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GLtf defines rotations as quaternions, glRotated expects angle/axis, with angle in degrees.
This commit is contained in:
Dave LeCompte 2022-03-01 08:11:22 -08:00
parent a1952053ee
commit d642c80a86
1 changed files with 34 additions and 5 deletions
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39
examples/glview/glview.cc
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@ -771,6 +771,30 @@ static void DrawCurves(tinygltf::Scene &scene, const tinygltf::Mesh &mesh) {
}
#endif
static void QuatToAngleAxis(const std::vector<double> quaternion,
double &outAngleDegrees,
double *axis) {
double qx = quaternion[0];
double qy = quaternion[1];
double qz = quaternion[2];
double qw = quaternion[3];
double angleRadians = 2 * acos(qw);
if (angleRadians == 0.0) {
outAngleDegrees = 0.0;
axis[0] = 0.0;
axis[1] = 0.0;
axis[2] = 1.0;
return;
}
double denom = sqrt(1-qw*qw);
outAngleDegrees = angleRadians * 180.0 / M_PI;
axis[0] = qx / denom;
axis[1] = qy / denom;
axis[2] = qz / denom;
}
// Hierarchically draw nodes
static void DrawNode(tinygltf::Model &model, const tinygltf::Node &node) {
// Apply xform
@ -785,15 +809,20 @@ static void DrawNode(tinygltf::Model &model, const tinygltf::Node &node) {
glScaled(node.scale[0], node.scale[1], node.scale[2]);
}
if (node.rotation.size() == 4) {
glRotated(node.rotation[0], node.rotation[1], node.rotation[2],
node.rotation[3]);
}
if (node.translation.size() == 3) {
glTranslated(node.translation[0], node.translation[1],
node.translation[2]);
}
if (node.rotation.size() == 4) {
double angleDegrees;
double axis[3];
QuatToAngleAxis(node.rotation, angleDegrees, axis);
glRotated(angleDegrees, axis[0], axis[1], axis[2]);
}
}
// std::cout << "node " << node.name << ", Meshes " << node.meshes.size() <<