Hi,

I have been asked to render a scene containing a bath. I would like to model
it with a white porcelain inner, and something else outside. I have tried
this using triangle meshes and have run into problems.

I created a basic shape using sPatch, and saved the result as a RAW ASCII
format. I then imported this into Moray 3.1 using the 3D Win utility. This
worked fine, and I gave it a marble texture.

To create the inner of the bath, I copied the original shape, scaled it
equally by 0.99 so that it fit inside the outer shape, and gave it a
porcelain texture. I then rendered it in POVRAY.

Now the fun starts. I can see the inside through the outside! I thought that
this may be something to do with numerical precision and the proximity of
the meshes next to each other, so as a test I scaled the inner mesh to 0.5
and rendered again, so that there is a clear separation between the meshes.
Surprise: I can still see the inner mesh through the walls of the outer
mesh.

Both of the textures were non-transparent, so does anybody have an idea why
this is happening, and what I can do to get around this problem? Is there a
better way achieve my desired result?

Regards,

Anthony Bateman.

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