[vtkusers] Coincident polydata render

[Waldin Nicholas]

Looks like you're getting a numerical/rounding error. I.e. you have two points so close to each other, that the numerical error decides which one gets rendered.

the vtkExtractSelection is probably making the cube just a hair smaller (it's possible that it considers points to be outside of the cube when they aren't), so that the problem doesn't occur.

I'm not familiar with vtkExtractselection, so I'm not 100% sure.

________________________________________
From: vtkusers-bounces at vtk.org [vtkusers-bounces at vtk.org] on behalf of Mathieu Moigner [mmoigner at phenix-systems.com]
Sent: Wednesday, July 24, 2013 1:38 PM
To: vtkusers at vtk.org
Subject: [vtkusers] Coincident polydata render

Dear vtk users,

Here is my problem :

This is what i want : http://www.hostingpics.net/viewer.php?id=353989591.png
And what i get : http://www.hostingpics.net/viewer.php?id=764980532.png

The cube is a vtkpolydata, I create others vtkpolydata (coincident with
the top surface of the cube), so it is not surprising to get this result.


But if I create the polydata using vtkExtractSelection on the cube, and
then adding the result to the scene, I get this :
http://www.hostingpics.net/viewer.php?id=136487353.png, the render is ok.

I have absolutely no idea why.

I hope I made myself clear and someone could give me a hint.

Thks in advance.


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