Re: Issue with transparency and lighting

[James W. <ja...@fr...>]

Roger Holmes wrote:
> On 23 Aug 2009, at 17:48, James W. Walker wrote:
> 
>> It occurs to me that a possible solution is to use the accumulation
>> buffer, rather than blending, to add the contributions of multiple
>> lighting passes.
> 
> As long as your accumulation buffer has enough precision. Gut feeling  
> is for each component, floats or maybe 16 bit fixed would be OK but 8  
> bits might show artefacts which should not be there.

Good point.  I'm also a little concerned about how using the 
accumulation buffer might affect speed.

I've committed a hack to mostly solve my immediate problem.  This change 
only changes the behavior of the OpenGL renderer if you have set 
kQ3RendererPropertyDepthAlphaThreshold.

I may still experiment with the accumulation buffer scheme.
-- 
   James W. Walker, Innoventive Software LLC
   <http://www.frameforge3d.com/>