#351 ray tracing artifacts on non-surface points

unexpected behavior
open
nobody
None
8
2013-12-27
2013-10-25
Lee Butler
No

There are some odd single pixel artifacts (cracks/lines) present when ray tracing the attached geometry file's bar.r region. Make particular note of the face where the particle/tgc protrude. This seems to be along tanget lines for primitives not on the surface of the object.

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Discussion

  • Lee Butler
    Lee Butler
    2013-10-25

    An image of the odd result is now included in the attached image

     
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  • Cliff Yapp
    Cliff Yapp
    2013-10-25

    The issue (for those wondering) is not actually the obvious cylindar sticking up through the arb surface but the dark spotted circular lines and the gray straight line that seem to correspond to tangent hits.

    Checking previous versions of BRL-CAD, we seem to have similar edge artifacts (hard to say they're exact without the exact az/el, but the shapes and patterns are similar) back at least as far as 7.14.8.

     
  • Sharan
    Sharan
    2013-12-27

    I am able to reproduce this
    I imported the ASCII file and drew the bar.r then raytraced it, when i changed the angle and raytraced it again I was able to see the odd pixels making a circle.I have attached the rendered image.

     
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  • Sean Morrison
    Sean Morrison
    2013-12-27

    • Priority: 5 --> 8