Re: Question on transparent camera transformed objects.

[Peter M. <Pet...@mi...>]

Hi Frank,

Well, that's done the job. I did have problem with just
	
	glEnable(GL_LIGHTING);
	glEnable(GL_COLOR_MATERIAL);

some of the transparent objects without NULLIllumination setting where 
turning white but moving glEnable(GL_LIGTHING) and removing 
glEnable(GL_COLOR_MATERIAL) fixed that.

We are doing a week of test next week, I will let you know how that 
goes and maybe you could check the change-in.

Once again Thanks.

Peter.


On 29 Sep 2004, at 17:20, Frank Condello wrote:

> On 29-Sep-04, at 12:05 PM, Frank Condello wrote:
>
>> On 29-Sep-04, at 6:17 AM, Peter Michelsen wrote:
>>
>>>> That's correct-  the illumination of the last solid object is 
>>>> errantly maintained for the entire transparent pass. The bug report 
>>>> linked above includes a bit of a workaround if your're using the 
>>>> CVS source.
>>>
>>> I have test this solution as list in the bug report ( 96773 ).
>>>
>>> Yes it fixes the problem but effects all the other transparent 
>>> objects, they become white. So not a solution.
>>
>> Sorry - I didn't do exhaustive testing with that (it was just off the 
>> top of my head). You'll need enable lighting for the specular pass, 
>> or else it'll draw solid. i.e. put:
>>
>> 	 	glEnable(GL_LIGHTING);
>> 	 	glEnable(GL_COLOR_MATERIAL);
>>
>> Before the "// Second pass to add specular highlights" bit in 
>> IRTransBuffer_Draw. That should do it - I think...
>
> Actually, that's a little excessive... Just put 
> "glEnable(GL_LIGHTING);" above the "glBlendFunc( GL_ONE, GL_ONE );" in 
> the "if (instanceData->transNeedSpecular)" statement. You may need to 
> re-enable lighting at the bottom as well, but the next solid pass 
> should get that anyway.
>
> I'll add these notes to the bug report, but there are several GL 
> states (including lighting) that can be cached between triangles to 
> speed up the transparent renderer by quite a bit.
>
> Frank.
>
>
>
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