2.5 render times: sometimes faster, sometimes slower (+tips)

Recently i have been testing the renderings between both 2.5 and 2.49 and i have to say my feelings were mixed at the beginning. I have been opening some recent or older project files/images and just comparing the render times. Some of the scenes rendered faster in 2.5 (in fact most of them), but at the same time some were just slower! I have been testing with different settings and after a while i found out that the building of the raytree seems to take a lot on the some scenes that 2.5 renders slower.
So how can you improve that ?
Hum i was thinking to myself, strange that the raytree building takes lot of time. So i found the Raytrace Acceleration Structure in the performance tab in the Scene setting properties, and this is where everything happens. Basically the Auto setting work fine for most cases, except when there are a lot of instances/array of a same object and raytracing enabled like mirrors. In that case i found out the BLI BVH method works faster.
So whenever you have lots of faces and raytracing, don’t forget to try from Auto to some more adequate Acceleration Structure. I hope it can help someone in the future.

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7 Responses to “2.5 render times: sometimes faster, sometimes slower (+tips)”


  1. 1 tubir December 14, 2009 at 7:51 am

    goood posting friend….keep posting,,,,

  2. 2 tips December 14, 2009 at 7:54 am

    blogwalking and comment. thank for tips brow

  3. 3 xiongyaohua December 16, 2009 at 1:00 am

    Very helpful, Thanks!

    I’m doing a city scale traffic visualization project and there are many vehicle instance in the scene. I use to experience the insane long raytree building time, with your tips it’s much better now.

  4. 4 ZanQdo January 24, 2010 at 4:44 pm

    For instances use dupligroups and enable “Instances” in the performance tab, that will be another story

  5. 5 nw August 1, 2010 at 10:13 am

    Thanks heaps for this tip! BLI BVH worked like a charm for a particle heavy scene.

  6. 6 Jurel (Cristóbal Atria) November 5, 2010 at 7:49 pm

    It worked great for me; rendering a character’s turntable, about 630.000 polys.

    12 seconds (auto)
    4 seconds (BLI VHB)

  7. 7 DDR May 26, 2011 at 3:33 am

    Wow… Went from 12 or 15 to 3 seconds. Thanks! 😀


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