Question for "shader writing in Image3d tutorial"

[puma.snyder]

Hi

what do I have to set in the image3d output driver parameters tab in order to get this shader from the "shader writing in Image3d - part 2" tutorial to work properly? Do I have to set any "render as" although I already specified geometry in the shader? When leaving at the defaults the rendered volume does not match the geometry. Here is the shader.

Any Ideas?

image3d voxellize_backhit( string geofile = ""; vector test_vec = {0,1,0} )

{

float pu, pv;

int prim_number;

vector curP = P;

vector nml=0;

density=0;

prim_number=intersect( geofile, curP, test_vec*1000, curP, pu, pv );

if( prim_number > -1 )

{

nml = normalize(prim_normal(geofile,prim_number,pu,pv));

if( dot( normalize(test_vec), nml ) >= 0.0 )

density = 1;

}

}

Thanks in advance