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OSPRay particle radius and weight support

Sankhesh Jhaveri requested to merge sankhesh/vtk:pointgaussian_particles into master

This change adds per particle scale support via the point gaussian mapper's scale array + scale function and OSPRay particle volume's particle radius support.

The particle radii default to sensible point size for OSPRay context but are then scaled using the provided scale array and scale function.

When scalar visibility is enabled on the mapper, the particle volume's weight array is used to modulated using the scalar values.

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