[Paraview-developers] Issue for rendering 2 layers superimposed

[Cory Quammen]

Sébastien,

This looks like a classic case of z-fighting [1].

One solution is to offset one of the surfaces by a small amount in z.

Cory

[1] https://en.wikipedia.org/wiki/Z-fighting

On Fri, Sep 25, 2015 at 6:09 AM, PULVERAIL, Sebastien <
sebastien.pulverail at sogeti.com> wrote:

> Hi there,
>
>
>
> I am facing an issue that I don’t know how to solve.
>
>
>
> I build my own application based on Paraview just to read my simulation
> files.
>
> A simulation is based on three files :
>
> -          File 1 = list of points + list of cells + extra information,
>
> -          File 2 = something we called extraction points (an extraction
> point is based on the points of my model but the associated cells are not
> necessarily the same as the model ones),
>
> -          File 3 = extra point data.
>
>
>
> Let’s take a very simple example to explain the encountered problem.
>
> The considered model has only four points and a single cell (a quad
> basically).
>
> The extraction point is a triangle cell using the bottom-left point, so
> half of the quad is in the extraction point.
>
> As the points are the same in the model and the extraction points, the two
> cells are superimposed.
>
> If we consider that the model is colored with default color and the
> extraction point is colored with blue, the rendering won’t be as expected :
> it is kind of hatched rendering.
>
>
>
> Click on this link http://imgur.com/7WCxHAz to see a screenshot
> illustrating the problem on a more complicated example.
>
>
>
> Thank you for your help.
>
>
>
> Sébastien
>
>
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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