[Bf-committers] Sloppy code, slowing down Blender

Jacob Merrill blueprintrandom1 at gmail.com
Wed Apr 9 03:09:21 CEST 2014

What about collecting a list of all objects with LOD settings when p is
pressed, and then using the cameras view area to filter further? Also same
for speakers? Only loop through objects that are on a list?
On Apr 8, 2014 6:02 PM, "Campbell Barton" <ideasman42 at gmail.com> wrote:

> Hi, recently I noticed that Blender is slower then it was back in 2.4x
> days when it comes to many objects (just empties).
> I recall having 80'000 objects in a scene, while it was very slow to
> duplicate, Blender was usable apart from that.
> Two recent examples:
> ---
> On a test with ~20,000 objects I found blender was continuesly looping
> over all scenes (and set scenes recursively), to check if any of the
> objects were speakers, to update their sound time.
> Even when there were no speakers in the blend file. (Now theres a
> quick check to avoid this in `sound_update_scene`)
> ---
> Today I just stubmed upon `BKE_object_lod_update` being called on
> every redraw for every 3DView for every object, in every set-scene
> recursively and every dupli. Incase the game engine is enabled and
> LOD's are used.
> This stuff should really come up in code-review,
> (I can take some blame for not reviewing the patch in this case...)
> While I'm sure its not the main bottleneck in blenders viewport speed,
> its just sloppy and can be easily avoided (skip the loop if the
> game-engine is disabled for example, and only operate on objects which
> are visible!).
> Sometimes bad hacks are hard to avoid, in those cases at least add a
> comment that the code is inefficient with some explanation why a
> better method can't be used.
> For now I'll ifdef out this code when the game engine is disabled, but
> really I think we should be a bit better picking up on this stuff
> especially when it effects all users.
> --
> - Campbell
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