[jira] [Commented] (RNG-132) Package rng.sampling.shape for sampling coordinates from shapes

["Gilles Sadowski (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RNG-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17331653#comment-17331653 ] 

Gilles Sadowski commented on RNG-132:
-------------------------------------

bq. Create a rng.sampling.shape package

As per the [discussion on the "dev" ML|https://markmail.org/message/hyxb7v56qfnec4ur], I thought that this would be done in a new maven module.  But I now see that you were suggesting a {{commons-geometry-rng}} module in [Geometry] while I was actually implying a {{commons-rng-sampling-shape}} module in [RNG].

> 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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