fix(renderer): Disables light tree to keep rendering speed

blenderproc/api/renderer/__init__.py

@@ -2,7 +2,7 @@
     set_cpu_threads, toggle_stereo, set_simplify_subdivision_render, set_noise_threshold, \
     set_max_amount_of_samples, enable_distance_output, enable_depth_output, enable_normals_output, \
     enable_diffuse_color_output, map_file_format_to_file_ending, render, set_output_format, enable_motion_blur, \
-    enable_segmentation_output, set_world_background, set_render_devices, enable_experimental_features
+    enable_segmentation_output, set_world_background, set_render_devices, enable_experimental_features, toggle_light_tree
 from blenderproc.python.renderer.SegMapRendererUtility import render_segmap
 from blenderproc.python.renderer.FlowRendererUtility import render_optical_flow
 from blenderproc.python.renderer.NOCSRendererUtility import render_nocs

blenderproc/python/renderer/RendererUtility.py

@@ -123,6 +123,16 @@ def toggle_stereo(enable: bool):
     if enable:
         bpy.context.scene.render.views_format = "STEREO_3D"
 
+def toggle_light_tree(enable: bool):
+    """ Enables/Disables blender's light tree for rendering.
+
+    Enabling the light tree reduces the noise in scenes with many point lights,
+    however it increases the render time per sample.
+    See https://wiki.blender.org/wiki/Reference/Release_Notes/3.5/Cycles
+
+    :param enable: True, if light tree should be enabled.
+    """
+    bpy.context.scene.cycles.use_light_tree = enable
 
 def set_simplify_subdivision_render(simplify_subdivision_render: int):
     """ Sets global maximum subdivision level during rendering to speedup rendering.

blenderproc/python/utility/Initializer.py

@@ -118,6 +118,8 @@ def set_default_parameters():
         # cpu thread means GPU-only rendering)
         RendererUtility.set_cpu_threads(0)
         RendererUtility.set_denoiser(DefaultConfig.denoiser)
+        # For now disable the light tree per default, as it seems to increase render time for most of our tests
+        RendererUtility.toggle_light_tree(False)
 
         RendererUtility.set_simplify_subdivision_render(DefaultConfig.simplify_subdivision_render)