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- // Persistence of Vision Ray Tracer POV-Ray 3.1 Sample Scene
- // by Chris Young
- // MACRO2.POV demonstrates basic use of a macro to modify an
- // identifier parameter, not just do something based upon the
- // parameter. Defines a macro called Turn_Me which takes
- // an object identifier and re-declares it turned a specified
- // amount about a particular axis. The result is passed back
- // through the parameter.
-
- #include "colors.inc"
-
- light_source { <1000,1000,-1000>, White}
-
- camera { location <3,3,-10> direction 2*z look_at <0,0,0>}
-
- union {
- plane{y,-2} plane{-z,-10} plane{x,-10}
- pigment{checker Cyan,Yellow}
- }
-
- // Define the macro. Parameters are:
- // Stuff: The stuff to be rotated. This identifier is
- // actually re-declared and the new object is passed
- // back to the calling module.
- // Degrees: Number of degrees to rotate
- // Axis: The axis about which we'll rotate
- #macro Turn_Me(Stuff,Degrees,Axis)
- #declare Stuff=object{Stuff rotate Axis*Degrees}
- #end
-
- #declare Thing = cone{0,1/2,y,0}
-
- object{Thing // Display the original Thing
- pigment{rgb<1,0,0>}
- translate -2.25*x
- }
-
- Turn_Me(Thing,-90,x) // Turn -90 about x
-
- object{Thing // Thing was changed by Turn_Me
- pigment{rgb<0,1,1>}
- }
-
- Turn_Me(Thing,-90,y) // Turn -90 about y
-
- object{Thing // Thing was changed again
- pigment{rgb<1,1,0>}
- translate 2.25*x
- }
-
-