[Bf-committers] Problem of Rendering Speed

Ruan Beihong ruanbeihong at gmail.com
Tue Aug 4 05:54:58 CEST 2009

Hi Yaohua,
It's good to see chinese (I'm one too) in the maillist. I'm an
undergraduate in Wenzhou Medical College.
I'm neither an artist nor a tech guy. I use blender mainly to edit
some DV clips.

In my humble opinion, the particle system should not be used in this way.
Particles usually simulate something emits light and spreads randomly
on small scale but move regularly on large scale.
It's not proper either to control every particle in the system (I
wonder if it can be done even), nor to build thousands of
particle system in one scene. If I'm right (I'm not quite sure as I
hardly use particle system) you should give up the second

2009/8/4 Yaohua Xiong <xiongyaohua at gmail.com>:
> 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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James Ruan

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