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https://issues.apache.org/jira/browse/GEOMETRY-94?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17088564#comment-17088564
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Matt Juntunen commented on GEOMETRY-94:
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{quote}...shouldn't "ConvexSubPlane" rather be "HyperplaneConvexSubset"? I.e. a 
composition of words that all have a standard meaning.
{quote}

I would argue that the prefix "sub" is a standard convention in geometry. The 
terms "space" and "subspace" follow that convention as well as "hyperplane" and 
"sub-hyperplane" in our BSP reference literature. "HyperplaneConvexSubset" may 
technically have the same meaning, but as a Java programmer, when I see the 
word "set" at the end of that class name, I immediately think of a {{Set}} and 
start wondering how to add points to the object or iterate over all of the 
contained points. Clearly, that's not the intention of the class. For me, the 
term {{ConvexSubHyperplane}} implies a more mathematically defined structure.

> ConvexSubPlane Subclasses
> -------------------------
>
>                 Key: GEOMETRY-94
>                 URL: https://issues.apache.org/jira/browse/GEOMETRY-94
>             Project: Apache Commons Geometry
>          Issue Type: New Feature
>            Reporter: Matt Juntunen
>            Priority: Major
>              Labels: beta1
>
> There should be specific subclasses of {{ConvexSubPlane}} to allow for 
> optimization and ease of use.
>  - {{OpenConvexSubPlane}} - extends {{ConvexSubPlane}}; represents a convex 
> subplane that is open on a least one side and has infinite size
>  - {{ClosedConvexSubPlane}} - extends {{ConvexSubPlane}}; represents a convex 
> subplane with finite size; the 2D subspace is a polygon
>  - {{Triangle3D}} - extends {{ClosedConvexSubPlane}}; represents a triangle 
> in 3D space; most 3D models are or can easily be represented with triangles 
> so it would be good to have a dedicated class for this.



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