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I've been playing around with mapping a texture onto half of an oblate spheroid,
and I've gotten really weird results.
Here's what I get:
The image seems to be half-scaled compared to the object it gets mapped onto.
The image has a weird "doubling" effect. (top right)
When I display the same hemi-spheroid as a guide, my image-mapped object
disappears, (lower right)
but when I rotate them at different angles, I can see the image map above, and
through the green below. (lower left)
Also interesting is the "chopping" going on between the 4 views.
It's like there's differencing going on between things that should be
independent.
.... I think the trouble may be due to the nut behind my keyboard ...
//#######################################################################
Image file:
http://news.povray.org/*/attachment/%3Cweb.54375641cbb3d8155e7df57c0%40news.povray.org%3E/medallion1.png
//#######################################################################
#version 3.7;
global_settings{ assumed_gamma 1.0 }
#include "debug.inc"
Set_Debug (true)
#include "colors.inc"
#include "textures.inc"
#include "glass.inc"
#include "metals.inc"
#include "golds.inc"
#include "stones.inc"
#include "woods.inc"
#include "shapes.inc"
#include "shapes2.inc"
#include "functions.inc"
#include "math.inc"
#include "transforms.inc"
#declare Feet = 12;
#ifdef (SDL)
// do nothing
#else
//--------------------------------------------------------------------------------------------------------<<<<
//--------------------------------------------------------------------------------------------------------<<<<
//------------------------------------------------------------- Camera_Position,
Camera_look_at, Camera_Angle
#declare Camera_Number = 0;
//--------------------------------------------------------------------------------------------------------<<<<
//--------------------------------------------------------------------------------------------------------<<<<
#switch ( Camera_Number )
#case (0)
#declare Camera_Position = < 0, 0, -4*Feet> ; // front view
#declare Camera_Look_At = < 0, 0, 0.00> ;
#declare Camera_Angle = 65 ;
#break
#case (1)
#declare Camera_Position = < 5.00, 5.00, -4.00> ; // diagonal view
#declare Camera_Look_At = < 0.70, 1, 0.00> ;
#declare Camera_Angle = 42 ;
#break
#case (2)
#declare Camera_Position = < 0.00, 1.00,-20.00> ; // front view
#declare Camera_Look_At = < 0.00, 1.00, 0.00> ;
#declare Camera_Angle = 65 ;
#break
#case (3)
#declare Camera_Position = < 0*Feet, 2*Feet, 0*Feet> ; // top view
#declare Camera_Look_At = < 0.00, 0*Feet, 0*Feet> ;
#declare Camera_Angle = 65 ;
#break
#case (4)
#declare Camera_Position = < 0.00, 9*Feet, 27*Feet> ; // mobile view
#declare Camera_Look_At = < 0.00, 0*Feet, 33*Feet> ;
#declare Camera_Angle = 65 ;
#break
#case (5)
#declare Camera_Position = < 0.00, 6*Feet, 35*Feet> ; // mobile view
#declare Camera_Look_At = < 0.00, 6*Feet, 25*Feet> ;
#declare Camera_Angle = 65 ;
#break
#else
#declare Camera_Position = < 0.00, 1.00,-20.00> ; // front view
#declare Camera_Look_At = < 0.00, 1.00, 0.00> ;
#declare Camera_Angle = 65 ;
#break
#end // of "#switch ( Camera_Number )" -----------------------------
//-------------------------------------------------------------------------------------------------------<<<<
//-------------------------------------------------------------------------------------------------------<<<<
camera { location Camera_Position
right x*image_width/image_height
angle Camera_Angle
look_at Camera_Look_At
}
light_source {<0*Feet, 0*Feet, -10*Feet> color rgb <1, 1, 1>*0.4}
// sky --------------------------------------------------------------------
sky_sphere{ pigment{ gradient <0,1,0>
color_map{ [0 color rgb <1, 1, 1> ]//White
[0.4 color rgb <0.14, 0.14, 0.56>]//~Navy
[0.6 color rgb <0.14, 0.14, 0.56>]//~Navy
[1.0 color rgb <1, 1, 1> ]//White
}
scale 2 }
} // end of sky_sphere
#end // end SDL check
#declare Medallion =
texture {
pigment {//uv_mapping
image_map {
png "Medallion1.png"
once
//map_type 1 // planar
//interpolate 0
//once
//texture { pigment {Red} }
//texture { Gold_Metal }
}
} //rotate x*90 //scale 0.25 translate <1, 0, 0>
}
#declare Gold = texture {T_Gold_2A finish {phong 1 metallic reflection {0.2}} }
#declare Sine = function (x,y) {sin (y/sqrt (pow (x,2) + pow (y,2)) )}
#declare Circle = function (x,y) { 1- (pow (x,2) + pow (y,2)) }
//##############################################################################
#declare Hemisphere =
union {
difference {
sphere {0, 1 }
box {0, 1 translate <-.5, -.5, 0> scale 2}
texture {Medallion translate -0.5}
scale <18, 18, 1.5>
}
cylinder {<0,0,0>, <10, 0, 0> 0.125}
cylinder {<0,0,0>, <0, 10, 0> 0.125}
cylinder {<0,0,0>, <0, 0, 10> 0.125}
}
#declare Hemispheroid =
difference {
sphere {0, 1}
box {0, 1 translate <-.5, -.5, 0> scale 2}
scale <18, 18, 1.5>
pigment {Green filter 0.99}
}
object {Hemisphere translate <-15, 10, 0> }
//object {Hemispheroid translate <-15, 10, 0>}
object {Hemisphere rotate x*70 translate <15, 10, 0> }
//object {Hemispheroid translate <15, 10, 0>}
object {Hemisphere translate <-15, -10, 0> }
object {Hemispheroid rotate x*70 translate <-15, -10, 0>}
object {Hemisphere translate <15, -10, 0> }
object {Hemispheroid translate <15, -10, 0>}
//##############################################################################
#declare Quarter =
height_field {
function 200,200 {
pattern {
function {Circle (x, y)}
// waves scale 0.1
// turbulence 0.8
}
}
translate -z*1
/*pigment{ gradient <0,1,0>
color_map{ [0 color rgb <0, 0, 0> ] //Blue
[1.0 color rgb <1, 1, 1> ] //White
}
}*/
scale <10, 5, 10> * 0.5
rotate x * 0
}
#declare MedallionFunction =
difference {
union {
object {Quarter}
object {Quarter rotate y*90}
object {Quarter rotate y*180}
object {Quarter rotate y*270}
}
sphere {0, 1 scale 2 inverse}
rotate x*90
texture {Medallion}
}
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