clipka <ano### [at] anonymousorg> wrote:
>
> That's surprising to me. Can you give a sample scene?


During generating a sample scene I realize that this work. So I worked reverse
to localize my real problem.

It look like a combination of two paraobolic mirrors generate this singularity.

##### SAMPLE CODE #####

global_settings {
        max_trace_level 5
}

camera {
//      location <300,250,-50>  // sideview
        location <0,100,-1>     // worked
//      location <0,100,0>      // doesn't worked
//      location <0,100,1>      // worked
        look_at <0,100,20>
}

light_source {
        <0,2000,0>
        color rgb <1,1,1>
}

plane {
        y, 0
        pigment {
                checker color rgb<0,0,0> color rgb<1,1,1>
        }
        scale <100,100,100>
}
plane {
        y, 10000
        pigment { color rgb<0,0,1> }
        finish {
                ambient 0.6
        }
}

// Parabel 1
intersection {
        quadric {
                <-5/132,-5/132,0>
                <0,0,0>
                <0,0,-1>
                33/5
        }
        box {
                <-4,-4,4>
                <4,4,8>
        }
        scale <10,10,10>
        finish {
                metallic
                reflection 1
        }
        translate <0,100,0>
}

// Parabel 2
quadric {
        <5/26,5/26,0>
        <0,0,0>
        <0,0,1>
        7/10
        scale <10,10,10>
        finish {
                metallic
                reflection 1
        }
        translate <0,100,0>
}

##### END SAMPLE CODE #####

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