Re: Question on transparent camera transformed objects.

[Frank C. <dev...@ch...>]

On 5-Oct-04, at 7:09 PM, Dair Grant wrote:

> Frank Condello wrote:
>
>> This would be a temporary fix at best, but if someone with CVS access
>> wants to check it in that's fine with me.
>
> So in all the back and forth on this thread, I'm not sure what the  
> final
> patch was; can you forward that to me or point me at the bug with it
> attached?

I added some notes to bug #967773 - basically the workaround is to set  
the illumination state in ir_geom_transparent_render before drawing:

	if (thePrim->illumination == kQ3IlluminationTypeNULL)
	{
		glDisable(GL_LIGHTING);
		glDisable(GL_COLOR_MATERIAL);
	}
	else
	{
		glEnable(GL_LIGHTING);
		glEnable(GL_COLOR_MATERIAL);
	}

Then add a glEnable(GL_LIGHTING); call before the specular pass in  
IRTransBuffer_Draw. Kinda brute force but it works...

I have an even nastier workaround for bug #967958  
<http://sf.net/tracker/index.php? 
func=detail&aid=967958&group_id=45158&atid=442052>. In  
IRGeometryTriMesh.c, ir_geom_trimesh_build_transparent, in the last  
"Check for transparent vertices" loop, replace these two lines:

	m = vertexArray->vertexParents[n];
	E3Bit_Set(vertexArray->triFlags[m], kQ3TriFlagTransparent);

With this:

	for (m = 0; m < vertexArray->geomData->numTriangles; m++)
	{
		if (vertexArray->triFlags[m] & kQ3TriFlagTransparent)
			continue;
								
		theIndices = vertexArray->geomData->triangles[n].pointIndices;
		
		if ( (theIndices[0] == n) || (theIndices[1] == n) || (theIndices[2]  
== n) )
			E3Bit_Set(vertexArray->triFlags[m], kQ3TriFlagTransparent);
	}

This is pretty ugly and slow but it illustrates the underlying problem  
detailed in the bug report.

Frank.