[Pbrt-discuss] problem with the sphere

[Mohamed Yessine Yengui]

Hello!

When I tried to render the sphere model with pbrt, I noticed that there was
a dark point in the resulting image, normally, this point must be
illuminated. After analyzing, I perceived that the normal vector computed on
the sphere is not continuous. Could anyone help me to resolve this problem?

This is my .pbrt file and you find in attached the resulting image.  The
dark point is in the red circle.



 Film "image" "string filename"  ["sphere.exr"]
        "integer xresolution" [500] "integer yresolution" [500]
   Sampler  "bestcandidate"  "integer pixelsamples" [4]
   LookAt -12 -3 12 0 0 0 0 1 0
    Camera "orthographic"
    WorldBegin
   AttributeBegin
   CoordSysTransform "camera"
     LightSource "distant"  "color I" [ 3 3 3 ] "point from" [0 0 0] "point
to" [-1 -1 1]
    AttributeEnd
    AttributeBegin
     Material "plastic" "color Kd" [1.0 1.0 1.0] "color Ks" [8 8 8] "float
roughness" [.006]
    Shape "sphere" "float radius" [.3]
     AttributeEnd
    WorldEnd


Thanks
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