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- // Persistence of Vision Ray Tracer POV-Ray 3.1 Sample Scene
- // by Chris Young
- // LOCAL.POV demonstrates basic use of a temporary local identifier
- // using the #local directive. Also demonstrates new #undef directive.
- // See debug messages after rendering.
-
- #include "colors.inc"
-
- light_source { <100,1000,-1000>, White}
-
- background{rgb 0.4}
-
- camera { location -9*z direction 2*z look_at <0,0,0>}
-
- #declare Thing = sphere{0,1 pigment{Red}}
-
- /* Thing on the left is global */
- object{Thing translate -2.5*x}
-
-
- // This include file declares a local version of "Thing"
- // and leaves it at the origin.
- #include "local.inc"
-
-
- /* Now put "Thing" on the right. You get the original version.*/
- object{Thing translate 2.5*x}
-
-
- // The file "local.inc" also declares a local
- // identifier called "Local_Item" which disapears on exit.
-
- #ifdef (Local_Item)
- #debug "Local_Item found\n"
- #else
- #debug "Local_Item not found\n"
- #end
-
- // Now let's get rid of the global Thing
-
- #debug "Doing #undef Thing\n"
-
- #undef Thing
-
- #ifdef (Thing)
- #debug "Thing found\n"
- #else
- #debug "Thing not found\n"
- #end
-
-
-