clipka wrote:

> Warp <war### [at] tagpovrayorg> wrote:

>>   What happens if you *want* the texture to have an ambient value >0?

> Then you're screwed with radiosity...

include files could use a #define such as RADIOSITY_TEXTURES
to provide two versions of a texture depending on whether the
#define is set before #including. For textures which just use
a different ambient value that would be no extra effort to
write using a simple macro for ambient.

#macro AMBIENT(ambient_value)
#ifdef RADIOSITY_TEXTURES
   ambient 0
#else
   ambient ambient_value
#end
#end

#declare T_SOME_TEXTURE = texture
{
   pigment {...}
   normal  {...}
   finish  {... AMBIENT(0.15)}
}

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