[vtk-developers] vtkLODPointCloudMapper remote module

[Ken Martin]

Oops, my first send was rejected and I forgot to attach it to the second
try, here it is - Ken

On Fri, Apr 15, 2016 at 1:21 PM, Bill Lorensen <bill.lorensen at gmail.com>
wrote:

> Ken,
>
> I don't see the attachment...
>
> On Fri, Apr 15, 2016 at 8:52 AM, Ken Martin <ken.martin at kitware.com>
> wrote:
>
>>
>> Hiya folks,
>>
>> I have been playing with rendering point clouds using some LOD and
>> multithreading techniques. One result of this is vtkLODPointCloudMapper and
>> two supporting filters that reorganize the data into a better format for
>> rendering. I have placed these items into a VTK remote module (
>> http://www.vtk.org/Wiki/VTK/Remote_Modules) and have attached the cmake
>> file to pull it below.  This module does rely on Will's vtkPointCloud
>> module so make sure you have that and it is up to date first. This module
>> includes a test which generates a synthetic point cloud. This test can be
>> easily modified to adjust the number of points generated. In the image
>> below I used 100 million points and included the vtkPointFillPass to fill
>> small holes in the cloud, followed by a vtkEDLShadingPass to produce
>> lighting effects based on the depth buffer. Sort of an interesting example
>> of mixing point clouds with some render passes.
>>
>> The LOD Shader itself only implements a very small subset of VTKs
>> capabilities as it was designed to test out some different approaches to
>> rendering. I have included the description from the header file below to
>> give you some idea of what the class does.
>>
>>
>> [image: Inline image 1]
>>
>> Thanks!
>> Ken
>>
>>
>> // This mapper only implements a very small subset of VTK's features.
>> // Consider it experimental and as a starting point for other uses. This
>> // mapper is designed to take a multiblock point cloud of the form
>> // typically produced by vtkHierachicalBinningFilter and run through
>> // vtkPointCloudToMultiBlock followed by vtkMultiBlockToCompressed. If
>> // the compressed stage is skipped it will be done by the mapper
>> // internally.
>> //
>> // The result of these filters should be a multiblockdataset where the
>> // first block contains a sampling of the points from the entire point
>> // cloud.  Additional blocks will contain smaller subdivisions. A common
>> // arrangement is 1 grandparent + 8 parents + 64 children in an octree
>> // arrangement for a total of 73 blocks.
>> //
>> // This mapper uses unsigned shorts to store the XYZ values and uses
>> // either 3 unsigned chars for color or one unsigned short for single
>> // valued scalars.  When using single valued scalars the lookup table is
>> // hardcoded. When there is no color or scalars a blue to yellow pseudo
>> // coloring is done based on depth.
>> //
>> // This mapper uses timing and coverage metrics to determine what blocks
>> // to draw  and how much of any given block to draw to maintain the
>> // desired render rate. On a laptop with a nvidia 2Gig 960M (midrange
>> // card) I see around one billion points/sec for a dataset of 140
>> //  million points with RGB color
>> //
>> // While this mapper can be fed through a normal VTK pipeline, it also
>> // supports  being fed data one piece at a time using the SetDataForPiece
>> // method. The intent is that the file IO can be handled in one thread, a
>> // piece at a time, while the rendering  is handled in another thread.
>> // SetDataForPiece is what you would use to  pass data from the file IO
>> // thread to the rendering thread.
>> --
>> Ken Martin PhD
>> Chairman & CFO
>> Kitware Inc.
>> 28 Corporate Drive
>> Clifton Park NY 12065
>> 518 371 3971
>>
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>>
>
>
> --
> Unpaid intern in BillsBasement at noware dot com
>



-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

This communication, including all attachments, contains confidential and
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addressee.  Access to this email by anyone else is unauthorized. If you are
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action taken in reliance on it is prohibited and may be unlawful. If you
received this communication in error please notify us immediately and
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