[Paraview] Coloring isocontour by the coordinates outputted from a Transform filter and some other questions

[Shuhao Wu]

Hello Cory,

I've been playing around a little bit more and followed your suggestion 
with using the calculator to "expose" the transformed coordinates. 
However, my understanding is that this Calculator will duplicate the 
memory usage for that coordinate and be an additional step in the 
filtering process, slowing it down. I have to use the Calculator filter 
to expose all 3 coordinates before using a threshold to filter for only 
a subset region that I want to plt, which results in a filtering chain 
as follows:

ExposeX (Calculator) -> ExposeY (Calculator) -> ExposeZ (Calculator) -> 
ThresholdX (Threshold) -> ThresholdY (Threshold) -> ThresholdZ (Threshold).

This is 6 filters, which is very slow with my data set (>29M nodes in a 
rectlinear grid). Is there a way to speed this up?

Thanks,
Shuhao

On 2017-06-07 03:29 PM, Cory Quammen wrote:
> Shuhao,
> 
> Welcome to ParaView!
> 
> On Sun, Jun 4, 2017 at 6:33 PM, Shuhao Wu <shuhao at shuhaowu.com> wrote:
>> Hello all,
>>
>> Is there a way to color an isocontour via the coordinates outputted from a
>> Transform filter? I'm using the Transform filter to "normalize" my
>> coordinate systems and I want to display the isocontour colored by the
>> normalized Y coordinates. Do I have to create yet another Calculator filter
>> to recalculate the normalized Y value that is already calculated by the
>> Transform filter?
> 
> There is currently no direct way to color surfaces by coordinate
> value. You can, however, add a Calculator after the Transform filter
> and simply set the expression to coordsY - no recomputation of the
> normalization is needed. This will copy your normalized Y coordinate
> values to a new array named "Result", and you can then color the
> isosurface by "Result". "Result" is just the default name - you can
> change it however you wish.
> 
>> Also: is there a way to turn off one axis on the axis grid (so turn off the
>> Y axis display and leave only X and Z)?
> 
> Click the Edit button next to the Axes Grid option. Click the gear
> icon in the top right of the dialog that appears. Under Face
> Properties, click on the "Faces to Render" combo box. Turn off the
> sides you do not wish to see by selecting them in the combo box.
> 
>> What about changing the interval on
>> the axis itself (instead of incrementing by 100 as it chooses, increment by
>> 250).
> 
> In the same dialog described above, check the "X Axis Use Custom
> Labels", and you can specify exactly the labels you want. There is no
> property to directly change the increment.
> 
> Best,
> Cory
> 
>> I'm pretty new to Paraview (coming from Tecplot). Please bear with me as I
>> likely will have more question.
>>
>> Thanks,
>> Shuhao
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