Smoothing the output of Rotational Extrusion

ParaView Support
#1

I’m trying to make a visually impressive (as in, I’m willing to sacrifice some technical accuracy) 3-D movie based on 2-D axisymmetric data. I’ll walk through the steps I’ve tried and the reasons why.

I have cell-centered, multimaterial data, where the material is identified by an integer scalar field:

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I want to color materials differently, so I will focus on one of those first. I extract the specific material using two Clip filters:
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The result is quite blocky, because it is Cell Data, but I get spurious artifacts if I try to use Point Data: (using Contours is similar)
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I convert to Point Data and extract the surface in order to perform a rotational extrusion:
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This looks good, other than the discrete steps. I try to smooth these using the Smooth filter:
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This looks great, except for the seam where the extrusion “connects”.

Does anyone have any ideas on how I can improve this?

Thanks,

Nathan

#2

I’m wondering why you would get artifacts when converting to point data. Are you doing MergeBlocks and computing Ghost Cells before applying Cell Data To Point Data?

#3

Yes, I did both of those (2 levels of ghost cells). I assume that it’s because clipping around mat==2 captures some of the interpolation between materials 3 and 1.

#4

I wonder if you run clean to grid first. Ghost Cells wouldn’t get caught because the boundaries are likely global boundaries on the dataset. I believe Clean to grid would identify identical points and merge them.

#5

I’ve made some progress for what I need by only doing a 270 deg. rotation. It’s not terrible. Where would I apply the Clean to Grid filter?

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#6

Clean to grid after the rotation, if the last bit of new geometry from the rotation matches the position of the initial geometry (nearly identically) it should work…

#7

You may want to take a look into PBR or Raytracing rendering.
Supported by ParaView since 5.6.0.

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#8

I’m using PBR for the metallic parts in the later image above. Will ray-tracing help me? Everything we’re looking at is extruded, hollow, data. I’d LOVE for a way to make the black portion look smoky, but so far the best I’ve come up with is to texture it.