Descriptions and Samples for the POV-Ray Raytracer
by Friedrich A. Lohmüller
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scale = changing of the size general syntax: scale <sx,sx,sz>this causes a multiplication (enlargement or reduction of the size) of the dimensions of an object in all 3 basic directions. Hereby the x values (width) are multiplicated by sx, the y values (height) are multiplicated by sy and the z values (deepth) are multiplicated by sz. mirrowing at a coordinate plane: scale <-1,1,1>this causes an object to be mirrowed at the yz coordinate plane in x direction. |
Samples:
"scale<1,1,1>" causes nothing, this means that all is shown by 1:1.
"scale<1,0.5,1>" reduces the values in y direction to the half.
"scale<2,1,1>" expands the values in x direction to double width.
"scale<1,1,-1>" mirrows an object at the xy plane in x direction.
Attention:
The step by step application of
rotation, translation and concentrical streching ("scale")
in general is not interchangeable!
The result is not the same if we mix it up - it depends on the sequence on how we apply it!
While constructing scene descriptions too shallow
this often is a source of many errors with a high potential of frustration!!!
.
// to the image above:
#declare RedBall =
sphere{<0,0,0>,1
texture{pigment{color Red}
finish {ambient 0.15 diffuse 0.85 phong 1}}}
//------------------------------- row in z direction --------------
object{RedBall scale <1.00,1,1> translate <0,0, 0>} //At zero!!!
object{RedBall scale <0.67,1,1> translate <0,0,-3>}
object{RedBall scale <0.33,1,1> translate <0,0,-6>}
object{RedBall scale <1.50,1,1> translate <0,0, 3>}
object{RedBall scale <2.50,1,1> translate <0,0, 6>}
// ------------------------------- row in x direction -------------
object{RedBall scale <1,4.6,1> translate <-6,0, 0>}
object{RedBall scale <1,2.0,1> translate <-3,0, 0>}
object{RedBall scale <1,0.6,1> translate < 3,0, 0>}
object{RedBall scale <1,0.3,1> translate < 6,0, 0>}
//------------------------------------------------------------------
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Hint: |
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"rotate" | overview |  |
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"matrix" - shearing, etc. |
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