I have a building texture for a city where I have a texture map:

texture {
   gradient y
    texture_map{
         [0.00 Bricktex]
         [0.35 Bricktex]
         [0.35 BlackGlasstex]
         [0.65 BlackGlasstex]
         [0.65 Bricktex]
         [1.00 Bricktex]
         }
         scale 1/10
       }

The Bricktex defintion includes a normal{bumps scale 0.01} .

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

I think it would be wonderful if I could simply say normal{down} .

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