[vtkusers] Draw points with gaussian fade out

[Markus Neuner]

Hi Michka,

You could try to generate volumetric data using Gaussian splats.

There are two solutions to this problem:
  - Create the 3D Gaussian function on the CPU during application 
initialization, and create a 3D texture from that.

  - But better and much faster is to compute the Gaussian directly in the 
fragment shader.

Have a look at vtkGaussianSplatter it may do what you want.

Regards,
Markus


On 06/15/2013 05:18 PM, Michka Popoff wrote:
> Hi
>
> I want to draw a lot of points in VTK (~1.000.000), with each point's color fading out to a transparent value, following a gaussian function.
> So the center will be bright (maximum intensity), and the border will have no color.
>
> I am able to draw a lot of points using vtkPoints, I can also change their color, but I am looking for a way to apply the fade out to every point. Of course the parameters of the gaussian function will be different for each point (intensity value in the middle, diameter).
>
> The result for 1 point would look like this : http://www.princeton.edu/~rvdb/images/deconv/Gauss2Psf.jpg
>
> Are there some filters/mappers I could use directly ? Or can I perhaps try to "hijack" vtkgaussiansplatter to achieve this ?
>
> Thanks in advance
>
> Michka Popoff
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