Strange Shader Behaviour

[SvenP]

I am having a problem with a shader i just started to write . The shader shows up fine in shops preview but only renders white in mantra . Maybe one of you knows a solution for that problem .

Screenshot :

Source:

#define STEPMOD pow(dot(normalize(N),normalize(I)),4)
#define STEPS r*2/stepsize

float FalloffFunction(vector pivot,pos; float radius;) { return 1-pow(radius/distance(pivot,pos),4);} 

float DensityFunction(vector pos;)
{
float TotalDensity=anoise(pos*4,6,0.7,1)*4;
TotalDensity=clamp(TotalDensity,0,2);
return(TotalDensity);
}

surface
Cloud(
      float r=.5;
      float stepsize=.01;
      vector pivot={0,0,0};
     )
{

int    steps = STEPS*STEPMOD;
vector marchdir = normalize(P-Eye)*stepsize;
vector currentpos = P+nrandom()*stepsize;

vector Cv = 0,Ov = 0;
float TotalDensity=0;
float Density;
float Falloff;

if(dot(normalize(N),normalize(I))<0)
{
    int i;
    for (i=0;i<steps;i++)
    {
        Falloff = FalloffFunction(pivot,currentpos,r);
        Density = DensityFunction(currentpos);
        TotalDensity += Falloff*Density;
        currentpos += marchdir;
    } 
    TotalDensity=TotalDensity/(STEPS);
    Cf = Of = Af = TotalDensity;
}
else
{
    Cf=Of=Af=0;
}
}

[sibarrick]

I haven't checked your code but I have come across this before when nothing was wrong but houdini just rendered white until I resaved the code into a different otl....

[SvenP]

I haven't checked your code but I have come across this before when nothing was wrong but houdini just rendered white until I resaved the code into a different otl....

28414[/snapback]

i already tried that but it doesnt help

[sibarrick]

I just copy your code into an otl and it works fine. The only thing I did was change the name to v_cloud. So the code is good it must be an otl thing.

Try the attached

Cloud.otl

Oh and I did this in H8 not H8.1 don't know if that makes any difference.