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In the code below I've compared a path made with the cubic spline function
with a cubic spline prism.
The cubic spline function use a lower tension than the cubic spline in
prisms. While this may not be a bug, it's a strange inconsistency. The
tension used in the prism has been used for years now, but the one used in
the spline function creates much smoother splines paths. I personally think
the best solution would be to let the user control the spline tension in the
spline function, and perhaps even also in the cubic splines in prisms.
camera {location 11*y look_at 0 orthographic translate <4,0,4.5>}
background {color rgb 1}
#default {finish {ambient 1 diffuse 0}}
#declare MySpline =
spline {
cubic_spline
0,<2,3>,
1,<4,2>,
2,<6,2>,
3,<8,2>,
4,<6,0>,
5,<5,3>,
6,<6,6>,
7,<2,9>,
8,<0,5>,
9,<4,5>,
10,<2,7>,
11,<2,3>,
12,<4,2>,
13,<6,2>
}
union {
#declare M = 20;
#declare C = 1*M;
#while (C<=12*M)
#local F = C/M;
sphere {MySpline(F), 0.05}
#if (F=int(F))
sphere {MySpline(F), 0.1 pigment {color red 1}}
#end
#declare C = C+1;
#end
pigment {color 0}
rotate 90*x
}
prism {
cubic_spline
-0.1, 0,
14
<2,3>,
<4,2>,
<6,2>,
<8,2>,
<6,0>,
<5,3>,
<6,6>,
<2,9>,
<0,5>,
<4,5>,
<2,7>,
<2,3>,
<4,2>,
<6,2>
pigment {color <0.5,0.5,1>}
}
Rune
--
3D images and anims, include files, tutorials and more:
Rune's World: http://rsj.mobilixnet.dk (updated June 26)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk
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