Cycles: Reorganize Acceleration Structure UI panel.

Only show options that are valid for the used device (CPU, GPU, Multi).

Note: The panel isn't shown for OPTIX anymore, unless Multi device is used.

Reference: https://developer.blender.org/D13592

intern/cycles/blender/addon/properties.py

@@ -1452,6 +1452,19 @@ class CyclesPreferences(bpy.types.AddonPreferences):
                     num += 1
         return num
 
+    def has_multi_device(self):
+        import _cycles
+        compute_device_type = self.get_compute_device_type()
+        device_list = _cycles.available_devices(compute_device_type)
+        for device in device_list:
+            if device[1] == compute_device_type:
+                continue
+            for dev in self.devices:
+                if dev.use and dev.id == device[2]:
+                    return True
+
+        return False
+
     def has_active_device(self):
         return self.get_num_gpu_devices() > 0
 

intern/cycles/blender/addon/ui.py

@@ -118,6 +118,12 @@ def use_optix(context):
 
     return (get_device_type(context) == 'OPTIX' and cscene.device == 'GPU')
 
+def use_multi_device(context):
+    cscene = context.scene.cycles
+    if cscene.device != 'GPU':
+        return False
+    return context.preferences.addons[__package__].preferences.has_multi_device()
+
 
 def show_device_active(context):
     cscene = context.scene.cycles
@@ -661,6 +667,10 @@ class CYCLES_RENDER_PT_performance_acceleration_structure(CyclesButtonsPanel, Pa
     bl_label = "Acceleration Structure"
     bl_parent_id = "CYCLES_RENDER_PT_performance"
 
+    @classmethod
+    def poll(cls, context):
+        return not use_optix(context) or has_multi_device(context)
+
     def draw(self, context):
         import _cycles
 
@@ -673,23 +683,33 @@ class CYCLES_RENDER_PT_performance_acceleration_structure(CyclesButtonsPanel, Pa
 
         col = layout.column()
 
-        use_embree = False
+        use_embree = _cycles.with_embree
+
         if use_cpu(context):
-            use_embree = _cycles.with_embree
-            if not use_embree:
+            col.prop(cscene, "debug_use_spatial_splits")
+            if use_embree:
+                col.prop(cscene, "debug_use_compact_bvh")
+            else:
+                sub = col.column()
+                sub.active = not cscene.debug_use_spatial_splits
+                sub.prop(cscene, "debug_bvh_time_steps")
+
+                col.prop(cscene, "debug_use_hair_bvh")
+
                 sub = col.column(align=True)
                 sub.label(text="Cycles built without Embree support")
                 sub.label(text="CPU raytracing performance will be poor")
+        else:
+            col.prop(cscene, "debug_use_spatial_splits")
+            sub = col.column()
+            sub.active = not cscene.debug_use_spatial_splits
+            sub.prop(cscene, "debug_bvh_time_steps")
 
-        col.prop(cscene, "debug_use_spatial_splits")
-        sub = col.column()
-        sub.active = not use_embree
-        sub.prop(cscene, "debug_use_hair_bvh")
-        sub = col.column()
-        sub.active = not cscene.debug_use_spatial_splits and not use_embree
-        sub.prop(cscene, "debug_bvh_time_steps")
+            col.prop(cscene, "debug_use_hair_bvh")
 
-        col.prop(cscene, "debug_use_compact_bvh")
+            # CPU is used in addition to a GPU
+            if use_multi_device(context) and use_embree:
+                col.prop(cscene, "debug_use_compact_bvh")
 
 
 class CYCLES_RENDER_PT_performance_final_render(CyclesButtonsPanel, Panel):