quat_t anm_get_rotation(struct anm_node *node, anm_time_t tm)
{
quat_t rot, prot;
rot = anm_get_node_rotation(node, tm);
if(!node->parent) {
return rot;
}
prot = anm_get_rotation(node->parent, tm);
return quat_mul(prot, rot);
}
void anm_get_node_matrix(struct anm_node *node, mat4_t mat, anm_time_t tm)
{
int i;
mat4_t rmat;
vec3_t pos, scale;
quat_t rot;
pos = anm_get_node_position(node, tm);
rot = anm_get_node_rotation(node, tm);
scale = anm_get_node_scaling(node, tm);
m4_set_translation(mat, node->pivot.x, node->pivot.y, node->pivot.z);
quat_to_mat4(rmat, rot);
for(i=0; i<3; i++) {
mat[i][0] = rmat[i][0];
mat[i][1] = rmat[i][1];
mat[i][2] = rmat[i][2];
}
/* this loop is equivalent to: m4_mult(mat, mat, rmat); */
mat[0][0] *= scale.x;
mat[0][1] *= scale.y;
mat[0][2] *= scale.z;
mat[0][3] += pos.x;
mat[1][0] *= scale.x;
mat[1][1] *= scale.y;
mat[1][2] *= scale.z;
mat[1][3] += pos.y;
mat[2][0] *= scale.x;
mat[2][1] *= scale.y;
mat[2][2] *= scale.z;
mat[2][3] += pos.z;
m4_translate(mat, -node->pivot.x, -node->pivot.y, -node->pivot.z);
/* that's basically: pivot * rotation * translation * scaling * -pivot */
}
quat_t psys_get_rot(struct psys_emitter *em, float tm)
{
return anm_get_node_rotation(&em->prs, ANM_SEC2TM(tm));
}