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I'm finding that my bezier_spline lathes get uv_mapped pigments wrong -
the y component is inverted inside each spline segment.
Attached is a picture, and the source, showing the problem (and that the
other spline types, and sors, are unaffected).
Is this a known bug? I couldn't find any other references to it, but
maybe my google-foo failed...
Cheers,
Edouard.
camera {
perspective
location < 0.0, 3, -6>
right x * 1
up y * image_height / image_width
angle 45
look_at < 0, 0.5, 0>
}
light_source {
< -20, 15, -15>
rgb 1
}
plane {
<0.0, 1.0, 0.0>, 0.0
pigment { checker rgb 1, rgb 0.8 }
}
#declare linear_lathe =
lathe {
linear_spline
7,
<0.00000, 0.00000>, <0.25000, 0.06699>,
<0.43301, 0.25000>, <0.50000, 0.50000>,
<0.43301, 0.75000>, <0.25000, 0.93301>,
<0.00000, 1.00000>
}
#declare quadratic_lathe =
lathe {
quadratic_spline
8,
<0.00000, 0.00000>, <0.00000, 0.00000>,
<0.25000, 0.06699>, <0.43301, 0.25000>,
<0.50000, 0.50000>, <0.43301, 0.75000>,
<0.25000, 0.93301>, <0.00000, 1.00000>
}
#declare cubic_lathe =
lathe {
cubic_spline
9,
<0.00000, 0.00000>, <0.00000, 0.00000>,
<0.25000, 0.06699>, <0.43301, 0.25000>,
<0.50000, 0.50000>, <0.43301, 0.75000>,
<0.25000, 0.93301>, <0.00000, 1.00000>,
<0.00000, 1.00000>
}
#declare bezier_lathe =
lathe {
bezier_spline
24,
<0.00000, 0.00000>, <0.08682, 0.00760>,
<0.17101, 0.03015>, <0.25000, 0.06699>,
<0.25000, 0.06699>, <0.32139, 0.11698>,
<0.38302, 0.17861>, <0.43301, 0.25000>,
<0.43301, 0.25000>, <0.46985, 0.32899>,
<0.49240, 0.41318>, <0.50000, 0.50000>,
<0.50000, 0.50000>, <0.49240, 0.58682>,
<0.46985, 0.67101>, <0.43301, 0.75000>,
<0.43301, 0.75000>, <0.38302, 0.82139>,
<0.32139, 0.88302>, <0.25000, 0.93301>,
<0.25000, 0.93301>, <0.17101, 0.96985>,
<0.08682, 0.99240>, <0.00000, 1.00000>
}
#declare uv_pigment =
pigment {
uv_mapping
gradient y
color_map {
[ 0.0 rgb <1,0,0> ]
[ 0.333 rgb <0,0,1> ]
[ 0.666 rgb <0,1,0> ]
[ 1.0 rgb <1,0,0> ]
}
}
lathe {
linear_lathe
pigment { uv_pigment }
translate x*-1.8
}
lathe {
quadratic_lathe
pigment { uv_pigment }
translate x*-0.6
}
lathe {
cubic_lathe
pigment { uv_pigment }
translate x*0.6
}
lathe {
bezier_lathe
pigment { uv_pigment }
translate x*1.8
}
sor {
9
<0.00000, 0.00000>, <0.00000, 0.00000>,
<0.25000, 0.06699>, <0.43301, 0.25000>,
<0.50000, 0.50000>, <0.43301, 0.75000>,
<0.25000, 0.93301>, <0.00000, 1.00000>,
<0.00000, 1.00000>
pigment { uv_pigment }
translate z*1.8
}
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Attachments:
Download 'uv_lathe_bug.jpg' (39 KB)
Preview of image 'uv_lathe_bug.jpg'
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