A) NOISE3D DISALLOWS APPROPRIATE NUMBER OF PARAMETERS

First of all, the following line gives a message.
    #declare summy=summy+noise3d(minx,miny,minz);
whereas this one does not:
    #declare summy=summy+noise3d(minx);

Noise3d is a function defined over 3d space; it appears to be an
oversight not to allow three parameters in this function.

B) FUNC_ID NOT LIKED IN EXPRESSIONS.

This too gives an error message:

#declare summy=summy+obfun(minx,miny,minz);

Where I have previously defined obfun as
#declare obfun= function{pigment{object{MyObject}}} //   --OR--
#declare obfun=  function{pigment {leopard scale 30}}

It appears to be an oversight that I can insert these into an isosurface
but I cannot "use" these functions as is.


The application at hand is the making of a really cool Volume macro!

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