Hi,

I have a cylinder (open, hollow) that has a PNG graphic file as texture. That
image consist only of white dots (blurred edges) and the rest is transparent,
and I want to simulate light speed (or a wormhole travel, whatever).

The texture moves along that cylinder.

Outside of that cylinder is another one with a color_map (red to white to blue).

QUESTION

How can I achieve that of that PNG texture only the white color allows a part of
the outside color_map can shine through? "Filter" and "transmit" seem to be
rejected when using an image. Any idea?

SCENE SOURCE CODE

#declare Warp = texture
{
 pigment
 {
  image_map
  {
   png "Warp - 001.png"
   map_type 1
   interpolate 2
  }
  rotate < 0.0, 0.0, 90.0 >  //
  rotate < 0.0, 90.0, 0.0 > //
  scale < 10000.0, 10000.0, 10000000.0 >
  translate < 0.0, 0.0, (50000.0*clock) >
 }
 finish { ambient 1.0 }
}

#declare LightShift = texture
{
 pigment
 {
  gradient z
  color_map
  {
   [ 0.0 pigment Blue ]
   [ 0.5 pigment White ]
   [ 1.0 pigment Red ]

  }
  scale < 1.0, 1.0, 1000000.0 >
 }
 finish { ambient 1.0 }
}

background { Black }

cylinder // Warp
{
 < 0.0, 0.0, -1000000.0 > < 0.0, 0.0, 1000000.0 > 10000.0
 hollow
 open
 texture { Warp }
}

cylinder // Warp Light Shift
{
 < 0.0, 0.0, -1000000.0 > < 0.0, 0.0, 1000000.0 > 10000.01
 hollow
 open
 texture { LightShift }
}

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