forked from bartvdbraak/blender
Fix T40403: Particles disappear after rendering
Read the comment in ensure_curve_cache, it tells it all.
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@ -1942,7 +1942,29 @@ static void drawlattice__point(Lattice *lt, DispList *dl, int u, int v, int w, i
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#ifdef SEQUENCER_DAG_WORKAROUND
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static void ensure_curve_cache(Scene *scene, Object *object)
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{
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if (object->curve_cache == NULL) {
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bool need_recalc = object->curve_cache == NULL;
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/* Render thread might have freed the curve cache if the
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* object is not visible. If the object is also used for
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* particles duplication, then render thread might have
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* also created curve_cache with only bevel and path
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* filled in.
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*
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* So check for curve_cache != NULL is not fully correct
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* here, we also need to check whether display list is
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* empty or not.
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*
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* The trick below tries to optimie calls to displist
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* creation for cases curve is empty. Meaning, if the curve
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* is empty (without splies) bevel list would also be empty.
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* And the thing is, render thread always leaves bevel list
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* in a proper state. So if bevel list is here and display
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* list is not we need to make display list.
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*/
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if (need_recalc == false) {
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need_recalc = object->curve_cache->disp.first == NULL &&
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object->curve_cache->bev.first != NULL;
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}
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if (need_recalc) {
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switch (object->type) {
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case OB_CURVE:
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case OB_SURF:
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