[vtk-developers] vtkLODPointCloudMapper remote module

[Bill Lorensen]

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
>
> This communication, including all attachments, contains confidential and
> legally privileged information, and it is intended only for the use of the
> addressee.  Access to this email by anyone else is unauthorized. If you are
> not the intended recipient, any disclosure, copying, distribution or any
> action taken in reliance on it is prohibited and may be unlawful. If you
> received this communication in error please notify us immediately and
> destroy the original message.  Thank you.
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Search the list archives at: http://markmail.org/search/?q=vtk-developers
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/vtk-developers
>
>
>


-- 
Unpaid intern in BillsBasement at noware dot com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtk-developers/attachments/20160415/96f57bcb/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.jpg
Type: image/jpeg
Size: 154273 bytes
Desc: not available
URL: <http://public.kitware.com/pipermail/vtk-developers/attachments/20160415/96f57bcb/attachment-0001.jpg>