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QSADDLE.PI
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1992-09-19
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661b
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29 lines
// Generic Polyray input File
// Polyray input file: Alexander Enzmann
// Set up the camera
viewpoint {
from <0, 5, -5>
at <0, 0, 0>
up <0, 1, 0>
angle 30
resolution 160, 160
}
// Get various surface finishes
include "..\colors.inc"
// Set up background color & lights
background black
light <10, 10, -20>
// Quartic saddle - looks like the quadric saddle, but is squared off in
// the middle. The equation is:
object {
object { polynomial x^4 - z^4 - y }
& object { box <-1.5, -1.5, -1>, <1.5, 1.3, 1.5> }
bounding_box <-1.5, -1.5, -1>, <1.5, 1.3, 1.5>
rotate <0, 20, 0>
shiny_red
}