Re: Question on transparent camera transformed objects.

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

This would be a temporary fix at best, but if someone with CVS access 
wants to check it in that's fine with me.

Frank.

On 1-Oct-04, at 11:27 AM, Peter Michelsen wrote:

> 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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