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Yeah, you will want to call shade().

RayPacketData env_data;
RayPacket env_rays(env_data, RayPacket::UnknownShape, rays.begin(), rays.end(), 0, 0);

for(int i = env_rays.begin(); i < env_rays.end(); ++i) {
  // Set direction for each ray
  Vector dir;
  env_rays.setDirection(i, dir);
}

env->shade(context, env_rays);

for(int i = env_rays.begin(); i < env_rays.end(); ++i) {
  // Get out color
  Color c = env_rays.getColor(i);
}

The above should be correct, but I didn't compile or run it. ;)

James

On Jan 31, 2008, at 7:39 AM, Harsha Sri-Narayana wrote:

Sorry, I'm aware how large this mailing list is so I was kind of hoping the answer would drop into my head on its own.

I would like to be able to take a vector in world co-ordinates, say a normal of a particular vertex. And then use that vector to find which texel in the EnvMap it is currently pointing at so that I can get the radiance in that direction. I have the normals of my vertices and I can transform them into world-coords. But I'm not confident on how to map that vector to its corresponding texel value in the environment map.

I think something like envmap->shade() is the method I'm looking for, but I'm not sure.
-Harsha

James Bigler wrote:

I haven't heard back on this, yet.

On Jan 29, 2008, at 10:31 AM, James Bigler wrote:

Q3) Also I've loaded a HDR image into an EnvMapBackground object. Is there a way of looking up a radiance value from a vector? Or do I need to go through Texture<Color>* from within EnvMapBackground?

Could you be more specific about what you are trying to do?

James

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• [Manta] some questions, harsha sri-narayana, 01/29/2008
  • Re: [Manta] some questions, Thiago Ize, 01/29/2008
    • Re: [Manta] some questions, harsha sri-narayana, 01/29/2008
  • Re: [Manta] some questions, James Bigler, 01/29/2008
    • Re: [Manta] some questions, James Bigler, 01/30/2008
      • Message not available
        • Re: [Manta] some questions, James Bigler, 01/31/2008

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