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//
// diffusion.pov
//
// (c) 2021 Prof Dr Andreas Müller, OST Ostscheizer Fachhochschule
//
#version 3.7;
#include "colors.inc"
global_settings {
assumed_gamma 1
}
#declare imagescale = 0.077;
#declare N = 30;
#declare vscale = 10;
#declare r = 0.04;
camera {
location <43, 20, -20>
look_at <1, 0.83, 2.5>
right 16/9 * x * imagescale
up y * imagescale
}
light_source {
<40, 20, -10> color White
area_light <1,0,0> <0,0,1>, 10, 10
adaptive 1
jitter
}
sky_sphere {
pigment {
color rgb<1,1,1>
}
}
//
// draw an arrow from <from> to <to> with thickness <arrowthickness> with
// color <c>
//
#macro arrow(from, to, arrowthickness, c)
#declare arrowdirection = vnormalize(to - from);
#declare arrowlength = vlength(to - from);
union {
sphere {
from, 1.1 * arrowthickness
}
cylinder {
from,
from + (arrowlength - 5 * arrowthickness) * arrowdirection,
arrowthickness
}
cone {
from + (arrowlength - 5 * arrowthickness) * arrowdirection,
2 * arrowthickness,
to,
0
}
pigment {
color c
}
finish {
specular 0.9
metallic
}
}
#end
arrow(<0,0,0>, <3,0,0>, r, White)
arrow(<0,0,0>, <0,3,0>, r, White)
arrow(<0,0,0>, <0,0,3>, r, White)
#macro quadrant(A, B, C)
intersection {
sphere { <0, 0, 0>, 1
matrix <A.x, A.y, A.z,
B.x, B.y, B.z,
C.x, C.y, C.z,
0, 0, 0 >
}
plane { vnormalize(vcross(A, B)), 0 }
plane { vnormalize(vcross(B, C)), 0 }
plane { vnormalize(vcross(C, A)), 0 }
pigment {
//color rgbf<0.8,1,1,0.7>
color rgb<0.8,1,1>
}
finish {
specular 0.9
metallic
}
}
#end
#macro eigenvektor(E)
union {
cylinder { -E, 8 * E, r }
#declare r0 = 0.7 * r;
sphere { 3 * < 0, E.y, E.z >, r0 }
sphere { 3 * < E.x, 0, E.z >, r0 }
sphere { 3 * < E.x, E.y, 0 >, r0 }
sphere { 3 * E, r0 }
cylinder { 3*< E.x, 0, 0 >, 3*< E.x, 0, E.z >, r0 }
cylinder { 3*< E.x, 0, 0 >, 3*< E.x, E.y, 0 >, r0 }
cylinder { 3*< 0, E.y, 0 >, 3*< E.x, E.y, 0 >, r0 }
cylinder { 3*< 0, E.y, 0 >, 3*< 0, E.y, E.z >, r0 }
cylinder { 3*< 0, 0, E.z >, 3*< 0, E.y, E.z >, r0 }
cylinder { 3*< 0, 0, E.z >, 3*< E.x, 0, E.z >, r0 }
cylinder { 3*< E.x, E.y, 0 >, 3*E, r0 }
cylinder { 3*< 0, E.y, E.z >, 3*E, r0 }
cylinder { 3*< E.x, 0, E.z >, 3*E, r0 }
pigment {
color rgb<1,0.6,1>*0.6
}
finish {
specular 0.9
metallic
}
}
#end
#include "quadrant.inc"
//union {
// pigment {
// color rgb<0.8,1,1>*0.6
// }
// finish {
// specular 0.9
// metallic
// }
//}
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