The function CopyParticleToRegion converts the particle specified by the parameter PartIx (valid range 1..NParticles) as a contiguous region into the two-dimensional array Region. All pixels of the specified particle show up as 1s in the region array, all other are set to zero:
Region is automatically resized to the size of the particle image data.
The function returns the following error codes:
0 ... everything is OK
-1 ... the specified particle does not exist
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