static void clip_planes_from_rect(bContext *C,
float clip_planes[4][4],
const rcti *rect)
{
ViewContext vc;
BoundBox bb;
bglMats mats = {{0}};
view3d_operator_needs_opengl(C);
view3d_set_viewcontext(C, &vc);
view3d_get_transformation(vc.ar, vc.rv3d, vc.obact, &mats);
ED_view3d_calc_clipping(&bb, clip_planes, &mats, rect);
mul_m4_fl(clip_planes, -1.0f);
}
/* Get four planes in object-space that describe the projection of
* screen_rect from screen into object-space (essentially converting a
* 2D screens-space bounding box into four 3D planes) */
void paint_calc_redraw_planes(float planes[4][4],
const ARegion *ar,
RegionView3D *rv3d,
Object *ob,
const rcti *screen_rect)
{
BoundBox bb;
bglMats mats;
rcti rect;
memset(&bb, 0, sizeof(BoundBox));
view3d_get_transformation(ar, rv3d, ob, &mats);
/* use some extra space just in case */
rect = *screen_rect;
rect.xmin -= 2;
rect.xmax += 2;
rect.ymin -= 2;
rect.ymax += 2;
ED_view3d_clipping_calc(&bb, planes, &mats, &rect);
negate_m4(planes);
}
