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// This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License.
// To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ or send a
// letter to Creative Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.
// Persistence Of Vision raytracer sample file.
// File: SwirlBox.POV
// Desc: Stacked square rings in a snail shell shape,
// shows off the use of the while loop for creating objects,
// and for smoothly changing colors.
// Date: 10/1/95
// Auth: Eduard Schwan
// Updated: 2013/02/15 for 3.7
//
// -w320 -h240
// -w800 -h600 +a0.3
#version 3.7;
global_settings { assumed_gamma 1.0 }
// ------------------------------------------------------------------
// Look down at an angle at our creation
camera
{
location < 4, 9,-20>
angle 65 // direction 1*z
look_at < 0,-1, 8>
right x*image_width/image_height // keep propotions with any aspect ratio
}
// ------------------------------------------------------------------
// A white marble floor
plane
{
y, -0.1
texture
{
pigment
{
marble
turbulence 0.5 omega 0.7 rotate -40*y scale 6
color_map
{
[0.50 color rgb 1.0]
[0.57 color rgb 0.8]
[0.60 color rgb <0.9,0.8,0.7>]
[0.63 color rgb 1.0]
}
}
finish {ambient 0.2 reflection 0.3}
}
}
// ------------------------------------------------------------------
// Simple background for a simple scene
background { color rgb <0.0, 0.1, 0.2> }
// ------------------------------------------------------------------
// A light source
light_source { <50, 20, -50> color rgb 1 }
// ------------------------------------------------------------------
// create a simple square ring shape
#declare BasicShape = intersection
{
// flat pizza box
box { -1, +1 scale <1.0, 0.1, 1.0> }
// remove square hole in middle
box { -1, +1 scale <0.95, 1.1, 0.95> inverse }
}
// ------------------------------------------------------------------
// Set up the loop variables:
// the Counter variable will go from 0.0 to 1.0
// in NumIterations loops.
#declare NumIterations = 80; // try different numbers of boxes (20,40,80...)
// don't change these
#declare Counter = 0.0;
#declare Increment = 1.0/NumIterations;
#declare NumTwists = 360*2; // two full twists
// ------------------------------------------------------------------
// Create an iterated object built from our basic shape
union{
#declare Flipper = 0; // Flipper will switch between 0 and 1 each loop
#while (Counter<=1.0)
object
{
BasicShape
// boxes get smaller as we stack them up
scale <(1-Counter)*5,1,(1-Counter)*5>
// boxes get closer to center and stack upward as we go
translate <(1-Counter)*5, Counter*10, 0.0>
// rotate each box a little more as they stack
rotate NumTwists*Counter*y
// put down the texture
texture
{
pigment
{
// colors change as we stack them up
color rgb <1-Counter, Flipper, Counter>
}
finish { ambient 0.2 specular 0.7 roughness 0.05 }
}
}
#declare Flipper = 1 - Flipper; // flip its value (0->1 or 1->0)
// manually increment our counter inside the loop
#declare Counter=Counter+Increment;
#end
}
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