[Bf-committers] Problem of Rendering Speed

Matt Ebb matt at mke3.net
Tue Aug 4 06:25:38 CEST 2009

No, 2.5 doesn't have the new raytrace accelerator yet, and lots of
somewhat detailed objects spread over a large scene chokes the current
octree horribly.

I'd recommend just turning off raytracing if you don't need it, should
be much faster (until the new accelerator's in trunk, hopefully...)

Anyway, I'd also recommend asking these sorts of questions in the
support forums at blenderartists.org, not on this list :)



On Tue, Aug 4, 2009 at 2:19 PM, joe<joeedh at gmail.com> wrote:
> 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.
> Joe
> 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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