On 12/13/23 20:31, Cousin Ricky wrote:
> On 2023-12-13 20:16(-4), William F Pokorny wrote:
>>
>> In a related and FWIW category, how many know the following is a valid
>> way to specify a texture?
>>
>> #declare Sph00 = sphere { 0, 0.7 }
>>
>> #declare P = pigment { rgb <1,0.6,0.3> }
>> #declare N = normal { quilted 0.5 scale 1/3 }
>> #declare F = finish { emission 1/3 }
>>
>> object { Sph00 texture { P N F  }  } // Aspect updates by ID type!
> 
> I'm not even going to touch that!  Why tempt fate--or the parser?
> 

:-) The method was news to me too. A detail which popped out while 
looking at making interior_texture{} support more consistent with 
texture{}.

Though it rang an old bell. I think this form is something I'd seen in 
some SDL years ago where I didn't understand how what was coded worked.

I expect this method of update has been used as much by accident as by 
intent. Use by someone forgetting - or accidentally deleting - a 
pigment{}, normal{} or finish{} wrap of an ID. It is a short way to 
specify texture aspects I guess - especially if you don't want to pick 
up any part of the 'current' default texture.

Bill P.

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