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https://issues.apache.org/jira/browse/GEOMETRY-95?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116009#comment-17116009
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Matt Juntunen commented on GEOMETRY-95:
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bq. compute the set of visible elements from some vantage point.

Can you explain more about your intended use case here? I'm wondering if the 
linecast functionality is sufficient here. A simple case using linecasting 
would be 
1. Create a {{Ray}} from some eye location and look direction.
2. Cast it against 2 or more created regions.
3. See which one intersects first.

Are you picturing anything more than that?

> CSG Examples
> ------------
>
>                 Key: GEOMETRY-95
>                 URL: https://issues.apache.org/jira/browse/GEOMETRY-95
>             Project: Apache Commons Geometry
>          Issue Type: New Feature
>            Reporter: Matt Juntunen
>            Priority: Major
>              Labels: beta1
>
> Adding Constructive Solid Geometry examples and userguide entries to help new 
> users to the library use these features.



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