Fix T93082: Cycles baking not handling transparency correctly

For baking, replace transparent BSDF with holdout for baking. This ensure no
objects behind are baked, and that the baked image has alpha.

1 files changed, 8 insertions, 1 deletions

diff --git a/intern/cycles/scene/integrator.cpp b/intern/cycles/scene/integrator.cpp
index 737db8b98d5..a97833a8d32 100644
--- a/intern/cycles/scene/integrator.cpp
+++ b/intern/cycles/scene/integrator.cpp
@@ -14,11 +14,13 @@
  * limitations under the License.
  */
 
-#include "scene/integrator.h"
 #include "device/device.h"
+
 #include "scene/background.h"
+#include "scene/bake.h"
 #include "scene/camera.h"
 #include "scene/film.h"
+#include "scene/integrator.h"
 #include "scene/jitter.h"
 #include "scene/light.h"
 #include "scene/object.h"
@@ -212,6 +214,11 @@ void Integrator::device_update(Device *device, DeviceScene *dscene, Scene *scene
   if (!use_emission) {
     kintegrator->filter_closures |= FILTER_CLOSURE_EMISSION;
   }
+  if (scene->bake_manager->get_baking()) {
+    /* Baking does not need to trace through transparency, we only want to bake
+     * the object itself. */
+    kintegrator->filter_closures |= FILTER_CLOSURE_TRANSPARENT;
+  }
 
   kintegrator->seed = seed;