> Is there any option how to modify some attributes of some already created
> object...like changing scale of some polygon instance named "PODKLAD"?
>
> Because this example from another post makes three new objects instead of 3x
> modifying the one existing object:
>
> #declare ball = sphere {
>   1, <0, 1, 0>
>   pigment {rgb <1, 0, 0>}
>   //... and so on
> }
>
> object {
>   ball
>   translate <0, 1, 0>
> }
>
> object {
>   ball
>   pigment {rgb <1, 0, 0>}
> //not sure that this will override the pigment statement in the #define'd ball
> }
The pigment IS overriden, but by an identical one. Try pigment{rgb<0, 
0.5, 1>} to see the difference.
>
> object {
>   ball scale <10, 10, 10>
> }
>
>

You can always redefine any object:
#declare Ball=sphere{0, 1 pigment{rgb<1,0,0>}}
#declare Ball=object{Ball scale 10 translate <5,12,1> pigment{bozo}}

The original Ball object no longer exist after been replaced by a 
scalled, translated and retextured version of itself.


Alain

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