Remove parasitic dashing from the cuboid face in a complex 3D image

Question

I am making a complex 3D image; part of it is a Cuboid, another part is a DensityPlot3D:

Show[{
  Graphics3D[{{Opacity[0.5], FaceForm[Opacity[0.5]], 
     Cuboid[{-1, -1, 0}, {1, 1, 1}]}}, Boxed -> False],
  Graphics3D[{FaceForm[Directive[Blue]], Opacity[0.5], 
    Prism[{{-1, -0.1, 0}, {-1, 0.1, 0}, {0, 0, 0}, {-1, -0.1, 1}, {-1,
        0.1, 1}, {0, 0, 1}}]}],
  DensityPlot3D[
   Exp[-6 r^2 + 1.5 Sqrt[r]*Cos[θ/2]]*
     Exp[-15 (z - 0.5)^2] /. {r -> Sqrt[x^2 + y^2], θ -> 
      ArcTan[x + 0.001, y]}, {x, -1, 1}, {y, -1, 1}, {z, 0, 1}, 
   ColorFunction -> (If[# > 0, Red, Green] &)]

  }]

which looks like what follows:

As you see, the front face of the cuboid contains some dirt, some sort of a parasitic dashing. If I remove the DensityPlot3D, this dirt disappears:

Show[{
  Graphics3D[{{Opacity[0.5], Cuboid[{-1, -1, 0}, {1, 1, 1}]}}, 
   Boxed -> False],
  Graphics3D[{FaceForm[Directive[Blue]], Opacity[0.5], 
    Prism[{{-1, -0.1, 0}, {-1, 0.1, 0}, {0, 0, 0}, {-1, -0.1, 1}, {-1,
        0.1, 1}, {0, 0, 1}}]}]
  }]

and we see a clear face. Thus, it is due to the DensityPlot3D that I get the parasitic image part.

Any idea on how to remove it?

Does this work for you: Cuboid[1.001 {-1, -1, 0}, {1, 1, 1}]? — Kuba, Oct 14 '16 at 11:30
@ Kuba This removes the dirt from the front face, but creates one on the top and right faces. — Alexei Boulbitch, Oct 14 '16 at 11:37
Can't test more now but similar artifacts happen when there are overlapping polygons in 3d. So my idea was to shift something. — Kuba, Oct 14 '16 at 11:39
Can you try adding Method -> {"RelieveDPZFighting" -> True} to Show[]? — J. M.'s missing motivation, Oct 14 '16 at 11:40
@ J. M. Thank you, this works. Could you please formulate it as an answer, so that I can accept it? — Alexei Boulbitch, Oct 14 '16 at 11:46

score 7 · Accepted Answer · answered Oct 14 '16 at 12:54

7

Add

, Method -> {"RelieveDPZFighting" -> True}

to Show[].

answered Oct 14 '16 at 12:54

Feyre

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Remove parasitic dashing from the cuboid face in a complex 3D image

1 Answers1