[vtkusers] raytracing a point cloud to generate perspective projection

[Jothy]

I don't really understand your problem, but you can have a look at

http://www.cmake.org/Wiki/VTK/Examples/SimpleOperations/ProjectPointPlane

and also, you can use camera settings to project the points in the scene at
a given distance.Something like this

Renderer.GetActiveCamera().SetPosition([0,0,1000])
 Renderer.GetActiveCamera().SetFocalPoint(0,0,0)
 Renderer.GetActiveCamera().Pitch(90)


Jothy

On Tue, Aug 3, 2010 at 2:28 PM, <Gainey_M at klinik.uni-wuerzburg.de> wrote:

> I have just got started with vtk, having tried out other geometry
> processing software tools. I wish to generate a 2d perspective projection
> from a 3d point cloud. The points are extracted from a DICOM RT Structure
> Set and represent anatomical structures comprising a plurality of closed
> polygons each polygon having a number of points (x,y,z, tuples). I need to
> determine a projection of the structures on an image plane. More
> specifically I would like to write a binary mask file at the image plane
> where a "0" indicates that the bixel is outside the particular structure,
> and "1" indicates that the bixel is inside the structure.
>
> I need to do this for 5-10 structures generating up to 180 projections
> (i.e. the camera/scene rotates in 2degree steps). Attached is an unprocessed
> file (no processing of points e.g. outlier removal/unoriented normal
> removal) has been performed. Furthermore the determination of the projection
> should be performed quickly (max 1 minute for all projections of all
> structures, worst case 1800)), since post processing of the binary masks is
> required by other software.
>
> Any assistance would be gratefully appreciated.
>
>
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