Re: Workaround for this bug?

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

Keith Wiley <kw...@cs...> wrote:

>On Fri, 21 Jan 2005, Frank Condello wrote:
>
>>  First ensure the alpha in your art is not pre-multiplied (likely
>>the case already) then put the sun shape in a display group under a
>>fog object with its visibility set to false. This will ensure no
>>fog is drawn on the sun, which is typically a desired effect on all
>>celestial bodies. Also place a Lambert shader before the sun
>>geometry to turn off any potential specular highlights, since they
>>may display a similar artifact as fog.
>
>I have a question on this approach.  Is there something inherant
>about the display group that is supposed to make this alpha-with-fog
>thing work properly, or is that just the way you suggested to make
>sure the fog is submitted prior to the sun object?

A display group restricts the effect of a style.  The idea was to 
turn off fog for the sun, but not for everything.

>I ask because before trying to group the fog with the sun, I quickly
>tried submiting a fog turned off just prior to submitting the sun
>and then submitting the fog turned on again just after the sun...but
>the alpha-fog error is still present.  Is that what you would have
>expected?  Is the display group required?

I would not have expected that.  I don't know what's going on there.

>My problem with the display group is that I can't create it because
>I don't have a TQ3Object to add to it.  My sun (and all the objects
>in my program) are TQ3TriMeshData, not TQ3Object.  It won't compile
>passing that to Q3Group_AddObject.  Same is true for passing a
>TQ3FogStyleData to the group.  When I do this, Q3Group_AddObject
>returns NULL, which is supposed to mean there was an error with
>creating the group.

You're doing everything in immediate mode?  Is there some reason you 
don't create a TriMesh object from your TQ3TriMeshData?

-- 
   James W. Walker, ScriptPerfection Enterprises, Inc.
   <http://www.write-brain.com/>