Hi Pov People!

I've run into this problem: When we're modelling a tranparent object and
place it on another surface (a floor, a table etc.) we get an ugly
effect. The bottom surface of the transparent object will have the same
y-value as the surface that the object is placed on. Is this something
POV don't like? As an example I've included a minimalistic POV file with
a "floor" and a simple transparent object. As you'll see the bottom
surface of the transparent object goes ape (since it lies in the same
plane as the "floor"?). Can someone explain to me why this happens?

Thanks!

-Rune

The .pov file:
========

global_settings
{
   assumed_gamma 2.2
   ambient_light 0.8
}

background { color rgb <0.9, 0.9, 0.9> }

camera
{
   location <100, 100, 100>
   angle 18
   look_at  <0,5,0>
}

light_source { <250, 200, -100> color 1.5 }

// Floor
#declare T1 = texture
{
  pigment { rgb <.5, .5, .9> }
  finish { ambient 0.70 diffuse 0.70 }
}
mesh
{
  smooth_triangle
  {
    <-500, 0,  500>, <0,1,0>
    < 500, 0,  500>, <0,1,0>
    <   0, 0, -500>, <0,1,0>
  }
  texture {T1}
}

// Transparent object
#declare T2 = texture
{
  pigment { rgbt <.6, .6, .6, 0.90> }
  finish { ambient 0.5 diffuse 1.0 }
}
mesh
{
  smooth_triangle
  {
    <-10, 0,   5> <0, -1, 0>
    <  0, 0, -10> <0, -1, 0>
    < 10, 0,   5> <0, -1, 0>
  }
  smooth_triangle
  {
    <-10,  0,   5> <0, .6, .8>
    < 10,  0,   5> <0, .6, .8>
    <  0, 20,   0> <0, .6, .8>
  }
  smooth_triangle
  {
    < 10,  0,   5> <0.4,0.82,-0.4>
    <  0,  0, -10> <0.4,0.82,-0.4>
    <  0, 20,   0> <0.4,0.82,-0.4>
  }
  smooth_triangle
  {
    <  0,  0, -10> <-0.4,0.82,-0.4>
    <-10,  0,   5> <-0.4,0.82,-0.4>
    <  0, 20,   0> <-0.4,0.82,-0.4>
  }
 texture {T2}
}

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