Commit: b379f626ce3ec965984a6758ae4e52b7c0dbcc2a
Author: Antonio Vazquez
Date: Thu Jan 28 10:35:03 2021 +0100
Branches: master
https://developer.blender.org/rBb379f626ce3ec965984a6758ae4e52b7c0dbcc2a
Fix T85035: Gpencil render in background render wrong frame
Due a thread priority, the calculation of the current frame is not done before
the frames are available. This produces wrong render frames.
The solution is verify the current frame before doing the real render. This
adds only a few milliseconds, but it assures the frame is correct.
As the problem is only when render in background, the recalculation of the
frame is only necessary when do real render and not a viewport render, so there
is no impact in the animation FPS.
===================================================================
M source/blender/draw/engines/gpencil/gpencil_engine.c
===================================================================
diff --git a/source/blender/draw/engines/gpencil/gpencil_engine.c
b/source/blender/draw/engines/gpencil/gpencil_engine.c
index 20044fbe3ce..153dcfb6ea7 100644
--- a/source/blender/draw/engines/gpencil/gpencil_engine.c
+++ b/source/blender/draw/engines/gpencil/gpencil_engine.c
@@ -618,6 +618,14 @@ void GPENCIL_cache_populate(void *ved, Object *ob)
bGPdata *gpd = (bGPdata *)ob->data;
bool do_onion = (!pd->is_render) ? pd->do_onion : (gpd->onion_flag &
GP_ONION_GHOST_ALWAYS);
+ /* When render in background the active frame could not be properly set
due thread priority
+ * better set again. This is not required in viewport. */
+ if (txl->render_depth_tx) {
+ LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
+ gpl->actframe = BKE_gpencil_layer_frame_get(gpl, pd->cfra,
GP_GETFRAME_USE_PREV);
+ }
+ }
+
BKE_gpencil_visible_stroke_iter(is_final_render ? pd->view_layer : NULL,
ob,
gpencil_layer_cache_populate,
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