[Bf-committers] Problem of Rendering Speed

[joe]

His numbers sound sufficiently off for posting here; I imagine janne
will be interested in them.

Joe

On Mon, Aug 3, 2009 at 10:25 PM, Matt Ebb<matt at mke3.net> wrote:
> 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 :)
>
> cheers,
>
> Matt
>
>
>
> 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
>>> _______________________________________________
>>> Bf-committers mailing list
>>> Bf-committers at blender.org
>>> http://lists.blender.org/mailman/listinfo/bf-committers
>>>
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