Re: [Algorithms] Per-pixel specular with an arbitrary exponent

[Nenakhov S. <as...@kr...>]

Hi

Here is an article that describes how to simulate arbitrary specular power (works on ps.1.1 hardware)

http://www.gamasutra.com/features/20020801/beaudoin_01.htm

Regards, Sergey


07.01.2003 16:19:24, "Joris Mans" <jor...@pa...> wrote:

>Hi
>
>I ve been doing some per pixel bump mapping on GeForce3 in opengl and I
>was wondering if any of you had any alternatives to this:
>
>When rendering the lighting, I used texture-shader based bumpmapping so
>we could have any specular power function we wanted,but as it seems,
>this is quite slow. When however moving all per-pixel work to the
>pixelshader you loose the possibility to use high exponents on the
>specular map. 
>Now, I saw some thread about the "doom" way of doing things (or the
>supposed doom way ;)) where you render a into specular texture target
>the result of N.H, and use that texture to do a dependent texture read.
>Now, my question is, is this faster than using the texture shader way?
>Sure the computations involved cost less, but how about the sum of all
>parts (passes ;) ), doesn't it get slower in the end because you are
>rendering a scene multiple times? And arent there precision issues at
>the edges of objects in screenspace when using buffers like this?
>
>
>Joris
>
>
>
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