The attached images show a simple coloured scene with the default
POV3.1g settings for ambience values of 0.5, 0.999, 1.0, 1.001, & 1.5.

Why the very abrupt white-out for an ambience of 1.0 as compared to
+/- 0.1% from 1.0?

Martin.


The code is:

camera {location <-1,3,-3> look_at 0  translate 0.5*<-1,0,-1>}


light_source{<0,9,-18> rgb<0,0,1>*0.75}
light_source{<0,27,-18> rgb<0,1,0>*0.75 rotate 30*y }
light_source{<0,27,-18> rgb<1,0,0>*0.75 rotate -30*y }


difference{
  union{
    plane{y, 0}
    sphere{<2,0,3>, 0.5}
    sphere{<-2.5,0.5,4.5>, 0.5  scale <1,0.5,1>}
    box{0.5, -0.5  translate <-2,0,1>}
    cylinder{0, y, 0.5}
    cone{0, 0.5, y, 0  translate <0,0,-2>}
  }
  
  box{0.5, -0.5  scale<1,5,1>  translate <-2,0,-1>}
  cone{0, 0.5, -y, 0  translate <2,0.001,0>}

  texture{
    pigment{ colour rgb 1 }
    finish {ambient 0.5 diffuse 0.5} // <--- ambient changed here!
  }
}


-- 
----------------
Martin Lomas
mar### [at] ml1couk
----------------

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Attachments:
Download 'radiositytest w l0-75 a0-5 d0-5.jpg' (28 KB) Download 'radiositytest w l0-75 a0-999 d0-5.jpg' (29 KB) Download 'radiositytest w l0-75 a1-000 d0-5.jpg' (13 KB) Download 'radiositytest w l0-75 a1-001 d0-5.jpg' (29 KB) Download 'radiositytest w l0-75 a1-5 d0-5.jpg' (29 KB)

Preview of image 'radiositytest w l0-75 a0-5 d0-5.jpg'

Preview of image 'radiositytest w l0-75 a0-999 d0-5.jpg'

Preview of image 'radiositytest w l0-75 a1-000 d0-5.jpg'

Preview of image 'radiositytest w l0-75 a1-001 d0-5.jpg'

Preview of image 'radiositytest w l0-75 a1-5 d0-5.jpg'