"SharkD" <nomail@nomail> wrote:
> "Walls" are missing when using solid meshes in CSG. The problem is described in
> more detail in this thread:
>
>
http://news.povray.org/povray.general/thread/%3Cweb.49407a1e34307b75ef318dca0%40news.povray.org%3E/?mtop=22
>
> Here's a simple example scene:

The problem with that scene is that the "solid mesh" isn't solid at all.

An "inside_normal" statement is not intended to make a mesh solid - it's just
intended to help reduce artifacts with solid (or at least "almost-solid")
meshes.

A solid mesh is instead any mesh whose surface - as defined by its triangles -
fully encloses some volume (the "inside"). The mesh in your sample scene,
having only a single triangle, obviously does not meet this requirement.

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