[Paraview] Probe point clouds / Point to sphere generation

[Randy Hudson]

I've added vtkGaussianSplatter to the filter menu.  Passing your point 
cloud through that will spread the points' influence into the 
neighboring space, which will then be sampled by a regular grid of a 
resolution of your choosing.  You can also adjust the size of the 
Gaussian kernel.

I haven't tried probing the grid, though.

Here are the XML files I wrote to implement this (point to their 
directory with PV_INTERFACE_PATH):

GaussSplatFilter.xml
--------------------
<ModuleInterfaces>
  <ServerManagerFile name="GaussSplatFilter.pvsm"/>
  <Module name="GaussSplatter"
                         root_name="Splat"
          replace_input="0"
          menu_name="Gaussian Splatter"
                         module_type="Filter"
          long_help="Splatting"
          short_help="Splatting">
    <Filter class="vtkGaussianSplatter">
      <Input name="Input"
             class="vtkDataObject">
      </Input>
    </Filter>
    <InputMenu trace_name="Input" property="Input"
               id="im"
               label="Input"
               help="Set the input to this filter."
               input_name="Input"/>
    <Scale label="Kernel Radius"
           trace_name="KernelRadius"
           property="KernelRadius"
           help="Insert help here, later"
           resolution="0.01"
           display_entry="1"
           entry_and_label_on_top="0"
           display_value="0"/>
    <VectorEntry label="Sampling Grid Resolution"
                 trace_name="SamplingGridResolution"
                 property="SamplingGridResolution"
                 type="int"
                 length="3"
                 help="Set the number of bins in each dimension.  Make 
them at least twice the inverse of the kernel radius value (see Nyquist 
frequency."/>
         <Documentation>
                Splats
    </Documentation>
  </Module>
</ModuleInterfaces>


GaussSplatFilter.pvsm
---------------------
<ServerManagerConfiguration>
        <ProxyGroup name="filters">
                <SourceProxy name="GaussSplatter" 
class="vtkGaussianSplatter">
                        <InputProperty name="Input" command="SetInput">
                                <ProxyGroupDomain name="groups">
                                        <Group name="sources"/>
                                        <Group name="filters"/>
                                </ProxyGroupDomain>
                                <DataTypeDomain name="input_type">
                                        <DataType value="vtkDataObject"/>
                                </DataTypeDomain>
                        </InputProperty>
                        <DoubleVectorProperty
                                name="KernelRadius"
                                command="SetRadius"
                                number_of_elements="1"
                                default_values="0.1" >
                                <DoubleRangeDomain name="range" 
min="0.0001" max="1.0" />
                        </DoubleVectorProperty>
                        <IntVectorProperty
                                name="SamplingGridResolution"
                                command="SetSampleDimensions"
                                number_of_elements="3"
                                default_values="20 20 20" >
                                <IntRangeDomain name="range"/>
                        </IntVectorProperty>
                </SourceProxy>
        </ProxyGroup>
</ServerManagerConfiguration>




shawn mckenziie wrote:
> Hi all,
>
> I wish to use the Probe filter to sample attribute values of my point 
> cloud
> along a line. The resulting XY plot always only returns one value, as i
> assume it is not hitting any other points (perhaps due to 5 point 
> accuracy
> in my point set). I am wondering if there is an option available to 
> either
> a) increase my line width or error region to enable selection of closely
> neighbouring points, or
> b) generate spheres from each point in the point cloud so that a 
> line/sphere
> intersection registers on the plot
>
> I would appreciate any ideas, thanks
>
>
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