Raytraced tangency issue

Rendering
,
1

@nathanletwory
Is this a know issue?
I am pretty sure the geometry is built up by tangent arcs.

on ghosted looks ok

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image655×406 59.6 KB

on rendered also there is no problem
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image761×532 6.62 KB

but on raytraced it appears to have gaps and discontinuity.
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image749×446 47 KB

and it is not a stable result. the image below is the same positions same model.
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image701×538 42.3 KB

After boolean union the solids, it looks as expetected.

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image792×545 42.6 KB

2

Without a file one can only guess: far from world origin? displacement texture in a pbr material?

3

Not particularly far - 43 meters. And I also suspected the displacement, so I used the default material and only changed the color.
241121 Raytraced Descontinuity.3dm (263.9 KB)
picture just after saving…

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image577×448 47.4 KB

4

Ah, this is due to the internal jiggle function. Hmm, looks like at some point there was a smaller value for the jiggle function, but apparently I accidentally dropped a 0 increasing the jiggle factor by an order of magnitude.

Let me fix that.

RH-84866 RhinoCycles: jiggle factor incorrect, leading to gaps

Addendum: a fix is landing in 8.14. You will be able to control the jiggle factor if the original value of 0.0001f is not tight enough. There will be RhinoCycles.JiggleFactor and RhinoCycles.GpJiggleDistance.

1 Like
5

RH-84866 is fixed in Rhino 8 Service Release 14 Release Candidate