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With the transform statement it is possible to bundle a group of
transformations like "scale", "rotate", "translate" and/or "matrix",
in any wanted sequence by one single statement for all these transformations.
Syntax:
#declare My_Trans
= transform{ Free sequence of transformations} |
(Transformations here: translate, rotate, scale, or matrix.)
We use it like this:
object{ My_Object transform My_Transformation }
//or by
object{ My_Object transform {My_Transformation} } |
(with or without inner brackets!)
and the inverted transformation:
object{ My_Object transform {My_Transformation inverse} } |
(Needs the inner brackets!)
Here a example:
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An object called "Canoe" as well as the according hole
in the surface of the water "Canoe_outside" is wanted to be
placed i.e. in 3 different positions with different sizes / positions / orientations:
For this we first are defining the transformations, which lead to the wanted positions:
//------------------------------------- Positions:
#declare Canoe_Position1
= transform { rotate< 0,30,0> translate<0.0,0,1>}
#declare Canoe_Position2
= transform { rotate<-6,20,0> translate<1.5,0,5>}
#declare Canoe_Position3
= transform { rotate<5, 0,0> scale 0.55
translate< -0.3,0,-2.00>}
//-------------------------------------------------
Then the canoes were placed there:
//---------------------- Canoes at their positions:
object{ Canoe transform Canoe_Position1}
object{ Canoe transform Canoe_Position2}
object{ Canoe transform Canoe_Position3}
//-------------------------------------------------
and also the according holes in the water:
//-------------------------------------------------
difference{
plane{<0,1,0>, 0 }
object{Canoe_outside transform Canoe_Position1 }
object{Canoe_outside transform Canoe_Position2 }
object{Canoe_outside transform Canoe_Position3 }
texture{Polished_Chrome
normal {crackle 1 scale 5
turbulence 1
translate<0,0,5>}
finish {diffuse 0.9
reflection 0.40}}
}// end of difference
//----------------------------------------------- end |
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