Re: transparency & specularity

[Frank C <li...@si...>]

On 5-Apr-04, at 12:20 PM, James W. Walker wrote:

> On Apr 4, 2004, at 11:50 PM, Frank C wrote:
>
>> Is a global switch really necessary? Quesa/QD3D already allows you to 
>> control Phong shading per-group, so it's already possible to turn off 
>> specularity on a per-object basis (regardless if they're transparent 
>> or not). You could also use the specular colour as a hint, and turn 
>> off the extra processing when it's pure black, since the end result 
>> would be the same.
>
> In the current design, all the transparent triangles are saved in a 
> buffer and drawn at the end of the rendering pass.  There is no 
> indication of whether Phong illumination was on or off when a 
> particular triangle was added to the buffer, though it wouldn't be 
> difficult to add that.

I think it would be necessary to add that distinction, otherwise it 
would break expected behaviour when using Lambert or null shaders on 
transparent geometry.

Frank.