Le 19-06-11 à 22:36, Mike Horvath a écrit :
> When radiosity is enabled, there are multiple passes in a render, with 
> each pass rendering smaller and smaller boxes until it reaches 1x1 pixels.
> 
> Can this be disabled so that I can go straight to the final pass?
> 
> Thanks
> 
> 
> Michael

You don't want to do that unless you are loading radiosity data saved 
from an earlier render. In that case, use pretrace_start 1 pretrace_end 
1 in the radiosity block of the global_settings.

If using UberPOV, you can use no_cache in the radiosity block. The image 
WILL look somewhat grainy and the render will take more time.

The other option is to fiddle with pretrace_start and pretrace_end.
If you set both to 1, you'll only get a full frame block before the 
final render pass. This will result in an image of uneven quality and 
probably splotchy.

Normally, it don't reaches 1x1 pixel during the pretrace steps.
The pretrace is used to collect radiosity samples over the whole scene. 
Otherwise, the rendering of the first pixels will only benefit from a 
very restricted set of radiosity data, while pixels rendered later will 
benefit from the data collected by the early parts. The result is an 
image with a mixture of low quality sampling and high quality sampling.

The defaults are :
pretrace_start 0.08
pretrace_end 0.04

For good quality/final renders, you should reduce pretrace_end. Good 
values are in the 0.01 down to 0.0025 range. You can also reduce 
pretrace_start down to 0.02 in those cases.

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