[Bf-blender-cvs] [a2b18423589] master: Batch previews: improve speed of preview generation.

[Bastien Montagne]

Commit: a2b184235892650102f1766015961a959518a9a1
Author: Bastien Montagne
Date:   Tue Oct 6 16:52:09 2020 +0200
Branches: master
https://developer.blender.org/rBa2b184235892650102f1766015961a959518a9a1

Batch previews: improve speed of preview generation.

Force multi-threading of preview renders by setting appropriate tile
sizes (by default it would typically render on one or two threads only).

===================================================================

M	release/scripts/modules/bl_previews_utils/bl_previews_render.py

===================================================================

diff --git a/release/scripts/modules/bl_previews_utils/bl_previews_render.py b/release/scripts/modules/bl_previews_utils/bl_previews_render.py
index c9603e46ecf..6e3d04e7fa2 100644
--- a/release/scripts/modules/bl_previews_utils/bl_previews_render.py
+++ b/release/scripts/modules/bl_previews_utils/bl_previews_render.py
@@ -135,6 +135,9 @@ def do_previews(do_objects, do_collections, do_scenes, do_data_intern):
         scene.render.filepath = os.path.join(bpy.app.tempdir, 'TEMP_preview_render.png')
         scene.render.use_overwrite = True
         scene.render.use_stamp = False
+        scene.render.threads_mode = 'AUTO'
+        scene.render.tile_x = RENDER_PREVIEW_SIZE // 4
+        scene.render.tile_y = RENDER_PREVIEW_SIZE // 4
 
         image = bpy.data.images.new("TEMP_render_image", RENDER_PREVIEW_SIZE, RENDER_PREVIEW_SIZE, alpha=True)
         image.source = 'FILE'