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https://issues.apache.org/jira/browse/RNG-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332004#comment-17332004
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Gilles Sadowski commented on RNG-132:
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bq. As a work-in-progress does it matter? [...]
No, but I thought that from a user's POV, it was better to not have these
specific samplers bundled with the core samplers (i.e. distribution and common
utilities).
bq. [...] without use of objects from [Geometry]
Can we guarantee that no future class of the same kind will never need to
depend on [Geometry]?
bq. Any use of [Geometry] would sit on top of this by offering to sample from
geometry objects.
Isn't [Geometry] a better for home for an extension that combines [Geometry]
objects with implementations from the [RNG] "shape" package/module?
> Package rng.sampling.shape for sampling coordinates from shapes
> ---------------------------------------------------------------
>
> Key: RNG-132
> URL: https://issues.apache.org/jira/browse/RNG-132
> Project: Commons RNG
> Issue Type: Task
> Components: sampling
> Affects Versions: 1.4
> Reporter: Alex Herbert
> Assignee: Alex Herbert
> Priority: Major
>
> Create a {{rng.sampling.shape}} package in the sampling module to contain
> work-in-progress samplers for shapes.
> * UnitSphereSampler (N-surface) [1]
> * UnitBallSampler (N-volume)
> * UnitSimplexSampler (N-surface)
> * LineSampler (N-dimension points on a line segment or polyline)
> * TriangleSampler (N-dimension points within a triangle in a 2D plane)
> * TetrahedronSampler (3D points inside a tetrahedron)
> * SurfaceSampler (ND points on a triangulated surface) [2]
> * VolumeSampler (3D points inside a volume composed of tetrahedrons)
> * UnitCubeSampler (N-volume)
> [1] The UnitSphereSampler can be deprecated and a new version created to use
> a factory method to create the sampler (allowing optimisation for low
> dimensions).
> [2] The SurfaceSampler would be a composite sampler. For sampling a surface
> the TriangleSampler can be combined with the
> AliasMethodSamplerDiscreteSampler. The surface should be triangulated. The
> area of each triangle is used to create a distribution of which triangle to
> pick using the alias method. A sample is then taken from the chosen triangle.
> Shape geometry will not be validated beyond basic testing for non-finite
> values of input coordinates. Validation of shapes could potentially be done
> by creating a {{commons-geometry-sampling}} module in the commons geometry
> project.
>
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