Sorry if this is too obvious a question but I have looked through the docs and examples and I'm still confused (it's easily done).

I am trying to implement a simple voxel selection and marking system where the basic functions are:

Draw the mesh (using the voxel sphere example)
Use the camera and mouse position to cast a ray into the scene (works now)
Use a couple of mouse clicks to mark a region (very crude but it's not the problem. yet)
Change the density of the voxels in the region to a lesser density.
Re-draw the mesh

If I set the density of the selected region to to maxDensity / 2 or below, the ray casting and mesh generation agree but if I set it to maxDensity / 2 + 1 then those voxels are not removed from the mesh but rays will pass right through them.

If there is a way to change the thresholds of these functions then I have missed it.

Another possibly related issue I'm having is that when I assemble the mesh for ogre I use the PositionMaterialNormal but I never seem to getMaterial() != 0.

The code is here: http://charlieb.hopto.org/gitweb/index.cgi?p=ogre_vox.git;a=tree

cheers,
Charlie

Yeah... you are encountering some of the rough edges which I'm trying to improve at the moment. Basically, I see you are working with the CubicSurfaceExtractor, and in this case it's doesn't make much sense to have density values (a voxel is either solid or it isn't). I know the example uses MaterialDensityPair44 but that should probably be changed.

Try switching to Material8 instead, and never call setDensity() or getDensity(). Instead call set/getMaterial(). A material of 0 is empty space and any other material is solid.

Ah ah ok well good.

So if I switch to Material8 and use get and set material then when I use getMaterial on the mesh vertex will the value returned be the value that I set in the volume or is there still some mapping?

Thanks,
Charlie

Worked perfectly. I even got the shader to change the colour based on the material so I'm happy!