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From "Alex Herbert (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (RNG-132) Package rng.sampling.shape for sampling coordinates from shapes
Date Mon, 02 Aug 2021 11:07:00 GMT

     [ https://issues.apache.org/jira/browse/RNG-132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Herbert resolved RNG-132.
------------------------------
    Fix Version/s: 1.4
       Resolution: Implemented

> 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
>             Fix For: 1.4
>
>
> 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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