[vtkusers] vtkCutter leaves "gaps" -- [SOLVED] : sortof

[Gerrick Bivins]

David,
For the method where I saw the problem:
vtkPolyhedron::CheckContourDimensions

eigenvalues were stored as doubles.
Then the ratio of the eigenvalues was failing the tolerance check.
Are you saying that setting this tolerance based on the precision of the points
would change this?

Gerrick
From: David Gobbi [mailto:david.gobbi at gmail.com]
Sent: Wednesday, January 15, 2014 10:43 AM
To: Gerrick Bivins
Cc: vtkusers at vtk.org; Jeff Lee
Subject: Re: [vtkusers] vtkCutter leaves "gaps" -- [SOLVED] : sortof

Hi Gerrick,

It would be nice to make the tolerance into an option that could be set somewhere, but I don't know where the "Set" method for this option could go.

Are there any other VTK developers who can offer some advice?  Maybe use a tolerance of 1e-3 for single-precision points and a tolerance of 1e-12 for double-precision points?  That would seem reasonable to me.

  David

On Mon, Jan 13, 2014 at 3:53 PM, Gerrick Bivins <Gerrick.Bivins at halliburton.com<mailto:Gerrick.Bivins at halliburton.com>> wrote:
So I spent a couple of days trying to narrow this down.
It turns out to be a tolerance issue in a method of vtkPolyhedron that attempts to calculate the "CheckContourDimensions".
The tolerance is hardcoded to something like .001 and the check ends up returning a dimension of "1" for
the cells that had "gaps".
Decreasing the tolerance to 1e-12 allows the vtkCutter to work for all the models that I've tried so far.

I updated the bug with the info I found.

Any chance of getting a fix in for this in :
5.10.* patch?
6.1 release?

Gerrick

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