[Paraview] WG: AW: Re: 3d Contour plot on cylindrical grid - inaccurate contours with prefered direction in toroidal angle

[Held, Markus]

------ Originalnachricht------

Von: Held, Markus

Datum: Mo., 13.03.2017 21:05

An: samuelkey at bresnan.net;

Betreff:AW: Re: [Paraview] 3d Contour plot on cylindrical grid - inaccurate contours with prefered direction in toroidal angle



Dear sam key,



thank you for the fast reply. Actually we transform the R,Z,\varphi coordinates to cartesian x,y,z coordinates via filters in paraview. This is also shown in the picturre. However, we see the same problem in cylindrical coordinates. Here, the isosurface still prefers the /varphi direction.



2d contours in the R,Z plane are accurate.



Best regards

markus



------ Originalnachricht------

Von: Samuel Key

Datum: Mo., 13.03.2017 20:13

An: Held, Markus;

Betreff:Re: [Paraview] 3d Contour plot on cylindrical grid - inaccurate contours with prefered direction in toroidal angle



Markus,

Unless I am mistaken, PV works with rectangular Cartesian coordinates
(x,y,z)  If you supplied PV with cylindrical coordinates (r,z,\varphi) ,
and used a slice plane that contained the r=0.0 axis, then the two
cylindrical coordinates r and z would form a 2-D planar rectangular
Cartesian coordinate system. In this case, one would get an "accurate"
2-D contour of the data contained in the r,z-plane.

To get true 3-D contours (also known as, isosurfaces) from the
(r,z,\varphi) coordinates, as you write out the simulation results from
your software to the datum set for PV, use a transformation to convert
(r,z,\varphi) into (x,y,z).

Hope this helps

Sam Key


On 3/13/2017 4:43 AM, markus wrote:
> Dear all,
>
> i'm for a long time experiencing a contour plot problem in 3d. Our
> scalar data is on a cylindrical (R,Z,\varphi) grid. A 3d contour of
> the data produces correct "2d contours" in the RZ plane, but the
> contours are elongated in the \varphi direction, even if the data
> prefers another direction.
>
> Image here:
> ftp://ftp.uibk.ac.at/private/c7441143_20170403_7512b21ed0886d37bdf38b41d4056946
>
>
> The prefered direction is aligned to a given vector field.
>
> Is there a way to improve the 3d contours with a filter in paraview or
> maybe with the help of the given vector field?
>
> best regards
> markus
>
>
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