INVALID_ADDRESS wrote:

>
>#macro Stairs (Steps)
>  union {
>    #declare Step = 0;
>    #while (Step<Steps)
>      Stair () translate Step*<StairDepth, StairHeight, 0> }
>      #declare Step = Step+1;
>      #end//while Step
>    texture { VerySimpleStoneTex }
>    // "}" for "union {" omitted
>  #end//macro Stairs
>

(This thread is probably now so old you're ignoring it and may not get this,
unless you sort your news by date or something)

Here's yet another boneheaded question:
In the above macro, the variable "Step" is declared, and given a integer or
float value.  I don't understand at what point it could ever change its
value to "Steps," which is a string.  Just to be sure, I parsed through the
message looking for buried occurrences of "Steps," in case I missed where
you may have put something like
#declare Steps = Some number greater than 0

Excuse my cranial density...

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