//For AssImp versions < 3.1 (I think). Will wait a year a so before I use the 3.1 aiMatrix4x4-constructor instead
aiMatrix4x4 aiMatrix4x4Compose(const aiVector3D& scaling, const aiQuaternion& rotation, const aiVector3D& position) {
aiMatrix4x4 r;
aiMatrix3x3 m = rotation.GetMatrix();
r.a1 = m.a1 * scaling.x;
r.a2 = m.a2 * scaling.x;
r.a3 = m.a3 * scaling.x;
r.a4 = position.x;
r.b1 = m.b1 * scaling.y;
r.b2 = m.b2 * scaling.y;
r.b3 = m.b3 * scaling.y;
r.b4 = position.y;
r.c1 = m.c1 * scaling.z;
r.c2 = m.c2 * scaling.z;
r.c3 = m.c3 * scaling.z;
r.c4= position.z;
r.d1 = 0.0;
r.d2 = 0.0;
r.d3 = 0.0;
r.d4 = 1.0;
return r;
}
