"Greg M. Johnson" wrote:

> I want the BlackGlasstex definition to have its normal be "inny",
> "down", or  "flat & depressed"  **RELATIVE** to the bricks.  How do I do
> this?
>

It may not be what you're looking for, but specifying negative values for
the bump_size parameter inverts the apparence of the normal.
normal{bumps bump_size -0.5}

G.

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