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There seems to be a bug when testing inside() with some prisms and a point
on the bisector of an angle, where the bisector is the x-axis, but I
haven't found any report on this. The following code should demonstrate the
problem:
#include "colors.inc"
#default{finish{ambient 1}}
camera {orthographic location 4*y look_at 0}
background {color Gray50}
#declare Bound =
prism {
linear_spline
-1, 1, 3,
//These don't work
//<-1, 0>, < 1, 1>, < 0, 0>, < 1,-1>, <-1, 0>
//< 1, 1>, <-1, 1>, < .5, 0>, <-1,-1>, < 1,-1>
<-1, 1>, < 0, 0>, <-1,-1>
//<-1,-1>, < 1, 0>, <-1, 1>
//This one works as expected
//< 1, 1>, < 0, 0>, < 1,-1>
//rotate 360*y
};
object {Bound pigment {color Blue}}
#declare j = -10;
#while (j < 10)
#declare i = -10;
#while (i < 10)
sphere {
<i, 1, j>, .02
pigment {
#switch ( inside(Bound, <i, 0, j>) )
#case (0) color Red #break
#case (1) color Green #break
#else color Yellow #break
#end
}
}
#declare i = i+.25;
#end
#declare j = j+.25;
#end
When I render this on PovWin 3.6.1a the spheres along the x-axis are all
but one red even where the tested points are clearly inside the prism and
should be green. The other prisms have similar problems and I can't
reproduce this behavior along the z-axis. After rotating the prism object
by 360 degrees around the y-axis, the inner spheres colors are correct. Can
anyone confirm this?
I'm using Windows 2000 SP4 on an Intel P4 @ 1800 MHz with 512MB.
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