Finding missing faces in a mesh

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gnu-sense
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Finding missing faces in a mesh

Post by gnu-sense » Mon Dec 10, 2012 12:41 pm

I'm doing some experimentation with creating meshes in R, using the rgl package for creating and displaying meshes in R. I wrote an exporter script that allows me to export the mesh in BZW format (it's not ready for general use, but I'll probably post it when it works better). As an example to work with, I created a trefoil knot based on a cylinder. Evidently there is still a bug somewhere, because two faces are missing from the mesh (you can shoot and fly through the space there); either the vertices are enumerated in the wrong order, or they're just not enumerated at all (probably the latter). Since I'd like to fix whatever is wrong, I have to figure out how to hunt down the missing faces. Does anyone have a general approach for doing this in an arbitrarily large mesh? The trefoil knot has 192 faces. I can think of a few things like setting different materials on different faces to try to figure out which are which, but it seems to me that this is a general problem and there must be a better way. If it's any help, I can work in text/bzw, text/obj, Wings 3D, Blender (if I have to; it still freaks me out)...

Thanks in advance for any help. For reference, here is the trefoil knot bzw code, with the missing faces.

Code: Select all

define knot
 mesh
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  face
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  face
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  face
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  face
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  face
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  face
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  face
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  endface
 end
enddef

group knot
 position -200 -200 40
 size 10 10 10
 matref LinkMaterial
end
-- gnu-sense

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blast
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Re: Finding missing faces in a mesh

Post by blast » Mon Dec 10, 2012 2:41 pm

Running bzfs with debug level 3 (-ddd) provided this output:

Code: Select all

non-planar mesh face (-0.009293): 54 62 63 55  face
  # plane normal = -0.237834 -0.816635 -0.525873 -200.652
    vertices 54 62 63 55 # -190.417 -227.813 58.3333 -205.795 -219.501 52.3806 -202.285 -217.548 47.7594 -191.635 -224.31 53.4615
    matref 0
  endface

non-planar mesh face (0.005470): 112 120 121 113  face
  # plane normal = -0.76993 0.555459 -0.314123 -21.6764
    vertices 112 120 121 113 # -194.702 -217.268 24.0264 -194.684 -213.559 30.5422 -190.882 -210.237 27.0787 -190.841 -212.751 22.5493
    matref 0
  endface
"In addition to knowing the secrets of the Universe, I can assure you that I am also quite potty trained." -Koenma (Yu Yu Hakusho)

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gnu-sense
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Re: Finding missing faces in a mesh

Post by gnu-sense » Mon Dec 10, 2012 4:11 pm

blast wrote:Running bzfs with debug level 3 (-ddd) provided this output:
Thanks, blast, that does the trick. I'll add the next debug level to my test .conf file :)
I'll have to see what I can do about non-planar faces; my best guess is that some rounding is taking place somewhere that ends up torquing the faces. Triangles are probably safer anyway, if I can figure out how to make a cylinder with triangle faces, I'll do that...

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JeffM
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Re: Finding missing faces in a mesh

Post by JeffM » Mon Dec 10, 2012 8:25 pm

If you break all faces into triangles then you don't have to worry about them being planar or not ;)

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Re: Finding missing faces in a mesh

Post by gnu-sense » Wed Dec 12, 2012 7:30 pm

JeffM wrote:If you break all faces into triangles then you don't have to worry about them being planar or not ;)
I broke them into triangles, two per quad face, and now ALL of the formerly quadrilateral faces are folded, in or out. They must not have been planar?

/me scratches head... time to do some more digging on this one.

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Re: Finding missing faces in a mesh

Post by JeffM » Wed Dec 12, 2012 8:56 pm

yeah if they picked up a visible crease along the split then they were not planar :) you can smooth the vertex normals between the shared edge to make it graphically smooth (give all verts the normal for the planar face they are suposed to represent). If you don't provide normals then each vertex uses the surface normal of the face and that will make it look worse.

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