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

[Shuhao Wu]

Is there documentation on how the Box clip type work? I'm not quite sure 
how to do the math to convert the threshold values to the position/scale 
values.

Thanks,
Shuhao

On 2017-07-03 10:03 AM, Cory Quammen wrote:
> On Tue, Jun 20, 2017 at 9:33 PM, Shuhao Wu <shuhao at shuhaowu.com> wrote:
> 
>> 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.
> 
> 
> Yes, that's true unfortunately. By the way, if you need X, Y, and Z, you
> can use one Calculator filter to produce all three with the expression
> 
> iHat*coordsX + jHat*coordsY + kHat*coordsZ
> 
> This produces a 3-component array - you can then color your isosurface by
> just one of the components or by the magnitude.
> 
> 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?
>>
>>
> You could instead use a Clip filter with Clip Type set to Box. You have to
> do a little math to convert from your threshold values to the box Scale and
> Position properties, but it shouldn't be too bad, and will make your
> pipeline simpler and faster.
> 
> Cory
> 
> 
>> 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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>>>
>>>
>>>
> 
>