[Bf-committers] Problem of Rendering Speed

joe joeedh at gmail.com
Tue Aug 4 06:19:52 CEST 2009

That is really odd.  Anyone know if the main 2.5 branch has the ray
tracing instancing thingy in it?  If so, that might explain it; well,
that and if particles don't use it yet.


On Mon, Aug 3, 2009 at 9:27 PM, Yaohua Xiong<xiongyaohua at gmail.com> wrote:
> Hi everyone
> I'm doing a traffic visualization project using blender
> 2.5svn(details:
> http://blenderartists.org/forum/showthread.php?t=161741&page=2) and
> having some problem with rendering speed.
> I represent the vehicles in blender using two methods.
> 1. every vehicle is represented as an individual object(sharing the
> same mesh) and use key frame move the vehilce
> 2. vehicles are represented as a particle system, one particle for
> each vehicle. The trajectory of particles are load in using external
> cache file. every particle render as an object.
> The basic scene is the same for these two methods(2011 vehicles, 600
> frame) but the rendering speed is very different. The rendering speed
> for the first method is about 30 seconds/frame which I think quite
> normal but the render speed for the second method is about 15
> minutes/frame, it's 3000% slower!
> The real strange thing is that about 14 minutes of the 15 minutes is
> spend on the "Filling octree" phase of render, but the number of
> objects should be the same for both methods(2011 vehicles), what makes
> the difference in render time and how this can be improved? Anyone got
> an idea? Thanks in advance.
> --
> Yaohua Xiong
> Traffic and Transportation Engineering College, Tongji Univ.
> Cao An Road 4800#, Jia Ding District, Shanghai,  China
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