I am trying to determine what the front of a string is and depending on what
that substring is declare certan values.

I am using the following code:

         #if (substr(MyStr,1,1)="0")
            #declare TL = -0.6;
            #declare TR = -0.4;
         #end;

Povray gives me an error on the #if line of:

numeric expression expected but substr found instead.

Is there anyway to get an #if statement to examine a substr for a value?  If
not how do you get around this?

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