[Paraview] OSPRay, scaled spheres

Thu Oct 26 09:45:29 EDT 2017

A patch to factor in point size control can be found here:
https://gitlab.kitware.com/vtk/vtk/merge_requests/3499

David E DeMarle
Kitware, Inc.
Principal Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Thu, Oct 26, 2017 at 9:04 AM, David E DeMarle <dave.demarle at kitware.com>
wrote:

> Looks like:
>
> 1) I was wrong, you don't need to scale and bias the input array into
> 0..1. The transfer function editor widget's piecewise range controls let
> you specify what the input domain extent.
>
> 2) You are correct that there isn't currently a way to get the radii to be
> > 1.0 when applying the transfer function. Without the transfer function,
> the point size control sets the radii for all points. With it the transfer
> function's output (which is defined to be 0..1) controls the radii of each
> point. Please file a bug report.
>
> Notes: With Point Gaussian representation there is an extra "point
> gaussian radius" control that gets factored in. We could do that with
> ospray, or factor in the existing point size, or possible extend the
> transfer function editor widget to change the range extent to something
> other than 0..1.
>
>
> David E DeMarle
> Kitware, Inc.
> Principal Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909 <(518)%20881-4909>
>
> On Thu, Oct 26, 2017 at 6:16 AM, Heiland, Randy <heiland at iu.edu> wrote:
>
>> Recapping, hopefully the relevant bits:
>>
>> Pipeline: PgmableSource -> Glyph (only show Glyph)
>>
>> Glyph Properties:
>>  Source: 2D Glyph
>>  Type: Vertex
>>  Active Attrs: Scalars: cell_radius
>>  Scaling:  Mode: scalar
>>                Factor: 1
>>
>> OSPRay Use Scale Array - yes
>>                Scale Array: cell_radius
>> Enable OSPRay - yes
>>
>> Let’s say my cell_radius has a range [5,10]
>>
>> I cannot figure out how to scale up my cells to be large enough. I’ve
>> dabbled with the OSPRay Scale Function editor, with no success.
>>
>> The Scaling Factor above seems to have no effect. Is there a global
>> scaling factor I’m missing?
>>
>> (irrelevant bit, I think… I’m Masking: Every Nth Point)
>>
>> I’ll experiment with my simple 2 cell example later…
>>
>>
>> On Oct 25, 2017, at 5:19 PM, Heiland, Randy <heiland at iu.edu> wrote:
>>
>> Beauty. Thanks!! (I really need to take time to read the entire PV Guide)
>>
>> On Oct 25, 2017, at 5:14 PM, David E DeMarle <dave.demarle at kitware.com>
>> wrote:
>>
>> click the gear to show advanced properties, or use search field for glyph
>> type.
>>
>>
>>
>> David E DeMarle
>> Kitware, Inc.
>> Principal Engineer
>> 21 Corporate Drive
>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>> Clifton Park, NY 12065
>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>> -8662
>> Phone: 518-881-4909 <(518)%20881-4909>
>>
>> On Wed, Oct 25, 2017 at 5:11 PM, Heiland, Randy <heiland at iu.edu> wrote:
>>
>>> You lost me - in the Glyph Source block,I select Glyph Type = 2D Glyph.
>>> Then where is VERTEX? In the Display block, I choose Representation =
>>> Points which produces a blobby mess. But a very *smooth* blobby mess :)
>>>
>>> On Oct 25, 2017, at 4:46 PM, David E DeMarle <dave.demarle at kitware.com>
>>> wrote:
>>>
>>> That control is only available if the representation type is surface,
>>> this could explain why you don't see it on the ProgrammableSource.
>>>
>>> In the glyph filter, use 2D glyph, VERTEX.
>>>
>>>
>>>
>>>
>>>
>>> David E DeMarle
>>> Kitware, Inc.
>>> Principal Engineer
>>> 21 Corporate Drive
>>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>>> Clifton Park, NY 12065
>>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>>> -8662
>>> Phone: 518-881-4909 <(518)%20881-4909>
>>>
>>> On Wed, Oct 25, 2017 at 4:29 PM, Heiland, Randy <heiland at iu.edu> wrote:
>>>
>>>> I only see the “OSPRay Use Scale Array” on the Properties for Glyph,
>>>> not the Props for the ProgrammableSource. Expected? And so, OSPRay is
>>>> rendering the chunky polygonalized spherical glyphs (Representation =
>>>> Surface).
>>>>
>>>> If I could independently scale the implicit spheres and use OSPRay, I’d
>>>> prefer that until I do the vtkCutter. (thanks for confirming, Note 2)
>>>>
>>>>
>>>>
>>>> On Oct 25, 2017, at 3:35 PM, David E DeMarle <dave.demarle at kitware.com>
>>>> wrote:
>>>>
>>>> To change the size based on values:
>>>> check "OSPRay Use Scale Array" on "Display" section or "Properties" Tab
>>>> Choose the array name you want to scale by with "OSPRay Scale Array"
>>>> pulldown.
>>>> Define your value to radius transfer function via the "OSPRay Scale
>>>> Function" popup editor.
>>>>
>>>> Note 1: the transfer function is defined to map between 0.0 and 1.0 and
>>>> clamp outside of that range. Use a calculator to scale and bias into that
>>>> range. If you don't like having to do this, file a feature request to
>>>> remind the developers to implement it one of these days such that min is
>>>> defined to be array min and max.
>>>>
>>>> Note 2:Cutter will not cut through the implicit spheres.
>>>>
>>>> Note 3: Point Gaussian representation's Use Scalar Array, Guassian
>>>> Scale Array and Scale Transfer Function (which I riffed off of) are
>>>> similar. I'm not sure about scale and bias and cut with this GL shader
>>>> based side.
>>>>
>>>>
>>>> David E DeMarle
>>>> Kitware, Inc.
>>>> Principal Engineer
>>>> 21 Corporate Drive
>>>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>>>> Clifton Park, NY 12065
>>>> <https://maps.google.com/?q=21+Corporate+Drive+Clifton+Park,+NY+12065&entry=gmail&source=g>
>>>> -8662
>>>> Phone: 518-881-4909 <(518)%20881-4909>
>>>>
>>>> On Wed, Oct 25, 2017 at 3:16 PM, Heiland, Randy <heiland at iu.edu> wrote:
>>>>
>>>>> Just want to make sure I’m not missing something. In my Pgmable Source
>>>>> PolyData, I render Points and love the OSPRay-rendered spheres. However, is
>>>>> there any mechanism for (independently) scaling these, i.e., other than the
>>>>> fixed Point Size? Or is the only way to get scalar-value scaled spheres via
>>>>> the Glyph filter? If so, is it possible to control the
>>>>> resolution/triangulation of that glyph? Basically, I’m looking for ways of
>>>>> getting high-res spheres, but will also want to use vtkCutter on them later.
>>>>>
>>>>> thanks, Randy
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>>>>>
>>>>
>>>>
>>>
>>>
>>
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>
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