An issue I have hit a few times is that the SDL interpreter seems to have
trouble with macro definitions after the first inside say a layered texture.
Something like this:

#declare A_MACRO = {...}

#declare A_LAYERED_TEXTURE = {
texture { .... A_MACRO .... }
texture { .... A_MACRO .... }   // This macro substitution is not handled
}

does not work and I am in the habit of coding instead:

#declare A_MACRO {...}

#declare A_LAYERED_TEXTURE_1 = {... A_MACRO ... }
#declare A_LAYERED_TEXTURE_2 = {... A_MACRO ... }
#declare A_LAYERED_TEXTURE = {
texture { A_LAYERED_TEXTURE_1 }
texture { A_LAYERED_TEXTURE_2 }
}

which works fine.

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