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I spotted some small errors.
engelbert_buxbaum nous illumina en ce 2009-03-16 09:29 -->
> Hi,
>
> in an attempt to explain crystal groups I generated the following:
>
> camera {
> location <0, 0, -270>
> look_at <0, 0, 0>
> angle 1.7
> }
You could use an orthographic camera.
camera{orthographic
location -100*z
look_at 0
}
>
> global_settings {
> assumed_gamma 2.2
Phased out. Beter to leave out for future compatibility.
> max_trace_level 100
> }
>
> light_source { < 10, 10, -10> color rgb <1.0, 1.0, 0.8> } // right, top,
> front
> light_source { <-10, 10, -10> color rgb <1.0, 0.8, 1.0> } // left, top,
> front
> light_source { < 10,-10, -10> color rgb <0.8, 1.0, 1.0> } // right, below,
> front
> light_source { <-10,-10, -10> color rgb <1.0, 1.0, 1.0> } // left, below,
> front
> light_source { <0, 0, -10> color rgb <1.0, 1.0, 0.8> area_light
> <10,0,0>,<0,10,0>, 5, 5 } // center, front
Don't realy need that one.
Making adaptive 0 will greatly increase the rendering speed.
>
>
>
>
> //-------------------------- drawing 3 axes --------------------------------
>
> #macro Axis_( AxisLen, RedTexture,WhiteTexture)
> union{
> cylinder {<0,-AxisLen,0>,<0,AxisLen,0>,0.05
> texture{checker texture{RedTexture}
> texture{WhiteTexture}
> translate<0.1,0,0.1>}}
> cone{<0,AxisLen,0>,0.2,<0,AxisLen+0.7,0>,0
> texture{RedTexture}}
> }
> #end
>
Most of the time, you want 3 axis of the same length. Maybe you only need to
provide one length.
> #macro AxisXYZ( AxisLenX, AxisLenY, AxisLenZ, TexRed, TexWhite)
>
> union{
> object{Axis_(AxisLenX, TexRed, TexWhite) rotate< 0,0,-90>} // x axis
> object{Axis_(AxisLenY, TexRed, TexWhite) rotate< 0,0, 30>} // y axis
> object{Axis_(AxisLenZ, TexRed, TexWhite) rotate<-90,0, 0>} // z axis
>
> text{ ttf"arial.ttf", "x", 0.15, 0 texture{TexRed}
> scale 0.5 translate <AxisLenX+0.05,0.4,-0.10>}
> text{ ttf"arial.ttf", "y", 0.15, 0 texture{TexRed}
> scale 0.5 translate <-2,AxisLenY-1.0,-0.00>}
> text{ ttf"arial.ttf", "z", 0.15, 0 texture{TexRed}
> scale 0.5 translate <-0.4,0,AxisLenZ-6>}
> }
> #end
>
> // ----------------------- object ----------------------------------
>
>
> #declare Hexagon =
> intersection
> {plane {z, 1} /* Rotate 90 in z axis to stand up */
> plane {z, 1 rotate < 60, 0, 0>}
> plane {z, 1 rotate <120, 0, 0>}
> plane {z, 1 rotate <180, 0, 0>}
> plane {z, 1 rotate <240, 0, 0>}
> plane {z, 1 rotate <300, 0, 0>}
> plane { x, 1}
> plane {-x, 1}
>
> bounded_by {sphere{0, 1.5}}
> }
A box would provide a tighter bounding shape.
bounded_by{box{<1,1.5,1.5><-1,1.5,1.5>}}
Also, the use of a prism object may be more adventageous.
>
>
> #declare Hexagonal =
> intersection{
> object{ Hexagon
> }
> object{ Hexagon
> translate <0, 0.58, 1>
> }
> texture
> { pigment {color rgbf <0.1, 0.15, 0.5, 1.0> } // blue
> finish { ambient 0.5 diffuse 0.1 phong 0.2 }
That ambient value is very high. It gives a washed out aspect and make you loose
much 3D feeling.
> }
> interior
> { refraction on
This is uterly useless, as it's turned off by the next statement.
> ior 1.0
Any value other than 1 will cause the refraction to be active. A value of 1, as
here, effectively turn refraction OFF.
> fade_distance 10
> fade_power 0.2
Without a fade_color, this is pointless.
Also, fade_power of 0.2 is a fade acording to distance power 1/5 (or the fifth
root of the distance) whitch is totaly unrealistic. A value of 1 is physicaly
correct. A value of 1001 is also correct and turn on the "exponential" fading.
> }
> }
The ONLY place where refraction on IS relevant, is in a protons{} block of an
object.
>
> #declare CutOut =
> difference{
> object{ Hexagon
> }
> object{ Hexagon
> scale 1.001
> translate <0, 0.58, 1>
> }
> texture
> { pigment {color rgbf <0.2, 0.2, 0.2, 1.0> } // grey
> finish { ambient 0.5 diffuse 0.1 phong 0.05 }
> }
> interior
> { refraction on
> ior 1.0
> fade_distance 10
> fade_power 0.2
> }
> }
>
> #declare Final_Object =
> union{
> object{ Hexagonal }
> object{ CutOut }
> rotate <0, 90, 30>
> translate <0, 0, 1>
> scale <1.7, 1.7, -1.0>
> }
You have coincident surfaces where the two elements meet. You should move one or
the other a small bit.
>
>
> union{
> object{AxisXYZ (3,3,3,
> texture{ pigment{rgb<1,0,0>} finish{diffuse 0.8 phong 1}},
> texture{ pigment{rgb<1,1,1>} finish{diffuse 0.8 phong 1}})
> }
> object{ Final_Object
> }
> rotate<20,-20,0>
> }
>
> Both the hexagonal crystal and the cut-out hexagon render fine by themselfs, but
> in combination the crystal looses colour, also, the surface of the crystal in
> contact with the cut-out becomes invisible. I have fiddled with lighting and
> optical properties of the bodies for days, but I just don't get it. Any ideas?
>
> Thanks in advance
>
> Engelbert
>
>
>
>
--
Alain
-------------------------------------------------
The worst way to miss someone is to be sitting right beside them knowing you
can' t have them.
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