An implementation of a nil / zero normal{} pattern (niln)

Ref:

https://news.povray.org/povray.binaries.images/message/%3C657b1e7e%241%40news.povray.org%3E

...
default {
     pigment { rgb <0,0.7,0.5>}
     finish { diffuse 0.3 }
     normal { quilted bump_size 0.5 scale 1/6 }
}
#declare TxtrDflt = texture {
     pigment { Pigm99 }
     normal { concrete bump_size -0.2 scale 50 }
     finish { brilliance 3 }
}
...
//--- scene ---
...
#if (frame_number = 1) // R0C0
     object { ObjIso }  // Starts with TxtrDflt assigned
#end
#if (frame_number = 2) // R0C1
     object { ObjIso texture { pigment { rgb <0.5,0.5,0> } } }
#end
#if (frame_number = 3) // R0C2
     object { ObjIso texture { finish  { brilliance 7 } } }
#end
#if (frame_number = 4) // R1C0
     object { ObjIso texture { normal  {} } }
#end
#if (frame_number = 5) // R1C1
     object { ObjIso texture { normal  { niln } } }
#end
#if (frame_number = 6) // R1C2
     object { ObjIso texture {
             TxtrDflt
             pigment { rgb <0.5,0.5,0> } }
         }
#end
#if (frame_number = 7) // R2C0
     object { ObjIso texture {
             TxtrDflt
             finish  { brilliance 7 } }
         }
#end
#if (frame_number = 8) // R2C1
     object { ObjIso texture { TxtrDflt normal  {} } }
#end
#if (frame_number = 9) // R2C2
     object { ObjIso texture { TxtrDflt normal  { niln } } }
#end

Bill P.

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