The new feature I am describing here might not be of much use for
regular scenes, but I think, it comes handy for testing purposes.

Let me give an example.

I want to test a complex scene, because I had added some new parts to
it. I copy parts of the complex scene into a new file, and simplify the
requested textures of the original file (textures with large images,
complicated functions, or multiple textures) like this:

#declare TSimplified = texture
{
 pigment { rgb < 0.50, 0.50, 0.50 > }
}

#declare TA = texture { HullGray50 }
#declare TB = texture { HullGray50 }
#declare TC = texture { HullGray50 }
#declare TD = texture { HullGray50 }
#declare TE = texture { HullGray50 }
#declare TF = texture { HullGray50 }
#declare TG = texture { HullGray50 }
#declare TH = texture { HullGray50 }
#declare TI = texture { HullGray50 }
#declare TJ = texture { HullGray50 }
#declare TK = texture { HullGray50 }
#declare TL = texture { HullGray50 }
...

This way, I avoid loading a number of large pictures, or calling
functions that slow down the test renders of the test scene. But as you
see, I have to declare for each texture again and again.

-------------------------------------------

Here my suggestion. Please have a look to the declaration:

#declare TSimplified aka(TA,TB,TC,TD,TE,TF,TG,TH,TI,TJ,TK,TL) = texture
{
 pigment { rgb < 0.50, 0.50, 0.50 > }
}

Or, using the keyword "all" inside the brackets, this texture becomes
placeholder for all used textures within that scene:

#declare TSimplified aka(all) = texture
{
 pigment { rgb < 0.50, 0.50, 0.50 > }
}

-------------------------------------------

Knowing that many scene developers use describing names for their
various texture declarations, maybe we could even think about a feature
that applies the simplified test texture for all textures containing the
one or another word, here again an example:

#declare TSimplified aka(all("gray","Hull")) = texture
{
pigment { rgb < 0.50, 0.50, 0.50 > }
}

This last example would apply the simplified test texture only to all
those textures, that contain the string "gray" and/or the string "Hull".
The number of strings to be added to the keyword "all" in brackets can
range from one to x strings (any amount or so, if that would make sense).

The strength of this new proposed feature ("all") is, that it can
replace with only one line all existing requested textures. Or, just a
number of them (something the "Quality" command line feature does not
give to you). So you achieve a partial simplification while you can keep
high details on other areas.

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