/// rotate selection
void selection_rotate(const vec3f& ea) {
if(selected_point) return;
if(selected_frame) {
auto m = translation_matrix(selected_frame->o) *
rotation_matrix(ea.x, selected_frame->x) *
rotation_matrix(ea.y, selected_frame->y) *
rotation_matrix(ea.z, selected_frame->z) *
translation_matrix(- selected_frame->o);
*selected_frame = transform_frame(m, *selected_frame);
}
}
frame3f lineset_frame(LineSet* lines, int elementid, const vec2f& uv) {
auto l = lines->line[elementid];
auto f = lineset_cylinder_frame(lines, elementid);
auto r = (lines->radius[l.y]+lines->radius[l.x])/2;
auto h = length(lines->pos[l.y]-lines->pos[l.x]);
float phi = 2 * pif * uv.x;
float hh = h*uv.y;
float cp = cos(phi);
float sp = sin(phi);
frame3f frame;
frame.o = vec3f(r*cp,r*sp,hh);
frame.x = vec3f(sp,cp,0);
frame.y = z3f;
frame.z = vec3f(cp,sp,0);
return transform_frame(f,frame);
}
// compute the frame from an animation
frame3f animate_compute_frame(FrameAnimation* animation, int time) {
// find keyframe interval and t
auto interval_t = get_keyframe_details(animation->keytimes, time);
auto interval = interval_t.first;
auto t = interval_t.second;
// get translation and rotation matrices
auto trans=translation_matrix(t*(animation->translation)[interval+1]+(1-t)*(animation->translation)[interval]);
auto rot=t*((animation->rotation)[interval+1])+(1-t)*((animation->rotation)[interval]);
// compute combined xform matrix
auto rot_x=rotation_matrix(rot[0], x3f);
auto rot_y=rotation_matrix(rot[1], y3f);
auto rot_z=rotation_matrix(rot[2], z3f);
// return the transformed rest frame
return transform_frame(trans*rot_z*rot_y*rot_x, animation->rest_frame);
}
