[
https://issues.apache.org/jira/browse/RNG-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17331655#comment-17331655
]
Alex Herbert commented on RNG-132:
----------------------------------
Q. As a work-in-progress does it matter? Building it in a package under
{{o.a.c.rng.sampling}} it would be easy to move it to a new rng module in one
operation. But given that it is "sampling" then it fits under the sampling
package in the current module too. The composite samplers combining shapes will
require samplers from the {{o.a.c.rng.sampling.distribution}} package. I am OK
with either approach: sub-package in sampling, or new sampling-shape module.
My intension is to build all the samplers without use of objects from
[Geometry]. Any use of [Geometry] would sit on top of this by offering to
sample from geometry objects.
> 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.
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
