Check out the images in p.b.i -- the image was generated with the
following code: (rander with +QR)

camera {location 2*y look_at 0}
light_source { 2*y rgb 1}
global_settings{
  assumed_gamma 1.0  // makes error more apparent
  radiosity{}        // comment this out to get correct image under
MegaPov
}

plane {
  y,0
  pigment {
    spherical // or cylindrical -- doesn't matter
    color_map {
      [0 rgb 0]
      [1 rgb .05]
    }
  }
}

Take out the radiosity{} block, and it renders "correctly."  It does
this no matter what where the camera or light source is.  It renders
correctly under both Superpatch and plain ole' 3.1  All that is
happening is that the outer edge is being brightened more than it should
-- and, interestingly enough, the distance inwards that this ring
reaches is inversely proportional to the brightness of the center spot. 
The brighter the central spot, the smaller the area affected.  Anyone
ever seen this before, or have a clue what's causing it?
-Alex V.

Post a reply to this message