[GEM-dev] noise problem with glsl

[cyrille henry]

hello chris,
thanks for your sugestion

chris clepper a écrit :
> I haven't used the noise function becuase it does not run in hardware on 
> ATI or Nvidia (only 3DLabs).  
i did not know that.
what did you use then? a jpg texture?


>You might have to use temporary variables 
> or explicitly cast like:
> 
> vx += (float) (0.1 * noise1())
i tried this, but it does not change anything.
the error : "<stdlib>(3998)" does not look like the error i've got when 
i do this kind of mistake.

Cyrille

> 
> On 9/14/06, *cyrille henry* <cyrille.henry at la-kitchen.fr 
> <mailto:cyrille.henry at la-kitchen.fr>> wrote:
> 
>     hello,
> 
>     i received my orange book few days ago. so i'm back with glsl.
> 
>     i give up for now with multitexture. my aim was to use 1 noisy texture
>     to distord the other one.
>     i discover the noise fonction of glsl, but i've got problem, trying to
>     use it.
> 
>     by example, a simple vertex shader like this :
> 
>     void main(void)
>     {
>             vec4 v = vec4(gl_Vertex);
>             vec4 pos = gl_ModelViewMatrix * v;
>             float LightIntensity = max(dot(normalize(vec3(0.,3.,3.) -
>     pos.xyz),
>     gl_Normal), 0.0);
>             gl_FrontColor = gl_Color * LightIntensity;
> 
> 
>             v.x += 0.1 * noise1(v);  // commenting this line
>                                      // make the shader to work
> 
>             gl_Position = gl_ModelViewProjectionMatrix * v;
>     }
> 
>     gives me error :
> 
>     Vertex info
>     -----------
>     <stdlib>(3998) : warning C7011: implicit cast from "int" to "float"
>     <stdlib>(3998) : warning C7011: implicit cast from "int" to "float"
> 
>     (same errore with noise1, noise2, noise3.., whatever vecter size of the
>     input parametter)
> 
>     does anyone know where the problem came from?
>     what should i try? etc
> 
>     should i ask this question in an other mailling list (as i don't think
>     it's a gem problem)?
> 
>     does anyone interested in my working example: sould i upload my patch
>     somwhere?
> 
>     thanks
>     Cyrille
> 
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