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negative boolean causing unrelated render "hole"

srieschsriesch Posts: 4,241
edited January 2013 in Bryce Discussion

When I try to make a hole in this object using a negative boolean, a completely unrelated part of the object is not being rendered. Any ideas how to fix this?

It appears as though the undesired "hole" (circled in red) is a portion of the foreground part of the object that is not backed by the opposite side of itself.

(Other info: If you delete the boolean group, the object is fine. The boolean itself works fine. The rectangular hole on the left is actually there and not part of the problem. If you change the angle so the foreground portion of the object doesn't line up with the background portion, the issue is hidden, but I don't wish to do that in my real scene).

screenshot,_hull_and_terrain_problem.png
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Post edited by sriesch on

Comments

  • srieschsriesch Posts: 4,241
    edited December 1969

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    screenshot,_hull_and_terrain_problem_2.png
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  • srieschsriesch Posts: 4,241
    edited January 2013

    exactly the same scene, but with the group lowered down into the ground a bit so you can see over the top more. Now the front is ok but the back suddenly develops a hole.

    screenshot,_hull_and_terrain_problem_3.png
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    Post edited by sriesch on
  • Dan WhitesideDan Whiteside Posts: 500
    edited December 1969

    Hmm - Have you tried setting the "Solid when Boolean Rendering" in the Edit Mesh dialog for the ship import?

  • srieschsriesch Posts: 4,241
    edited December 1969

    It was checked, and unchecking it worked, thanks!

  • OroborosOroboros Posts: 326
    edited December 1969

    UNchecking it worked???

    ...Er.. OK.

    You might want to check the nature of your model. If UNchecking the solid button worked, sounds like the mesh's normals are reversed. Could cause trouble further down the track.

  • srieschsriesch Posts: 4,241
    edited December 1969

    Just out of curiosity, what was this checkbox supposed to be doing? I glanced through the manual, but didn't locate an explanation.

  • Dave SavageDave Savage Posts: 2,433
    edited December 1969

    In theory, the 'Solid When Boolean' option makes sure the mesh object is solid between the faces of the mesh.
    If that box is not checked, Bryce will interpret the mesh as a hollow mesh and when you punch a hole in it, the edges of the hole will not have a face but instead be an open void.

  • Dan WhitesideDan Whiteside Posts: 500
    edited December 1969

    When it's unchecked it just "trims" the surface of the Mesh. Checked, it treats the mesh as a "solid". Image (hopefully) shows this.
    Note this only applies to meshes, including terrains. Primitives are always "solid".

    solid_boolean.jpg
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  • srieschsriesch Posts: 4,241
    edited December 1969

    Understood, thanks guys.

  • cjreynoldscjreynolds Posts: 155
    edited December 1969

    I learn something new every time I come here :)

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