http://wiki.povray.org/content/Reference:User_Defined_Macros#The_macro_Dir
ective#Optional_Parameters

The example for the optional option for macros has a bit too many ";" 't 
won't run like that.

cleaned up:

#macro Foo(P1, optional P2)
#ifndef(local.P2) #local P2 = 0; #end // provide default for P2
...
#end

#declare X=1;
#declare Y=2;
Foo(X,Y)
#undef Y
Foo(X,Y)
Foo(X,)

ingo

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On 12/7/18 1:20 PM, ingo wrote:
> The example for the optional option for macros has a bit too many ";" 't
> won't run like that.

done: http://wiki.povray.org/content?title=Special:RecentChanges&hidebots=0

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in news:5c0ba8c7$1@news.povray.org Jim Holsenback wrote:

> http://wiki.povray.org/content?title=Special:RecentChanges&hidebots=0

Thanks,

ingo

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