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https://issues.apache.org/jira/browse/GEOMETRY-95?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116131#comment-17116131
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Gilles Sadowski commented on GEOMETRY-95:
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bq. [...] object B, project it onto a plane orthogonal to your look direction, 
and then subtract the projection of object A onto that same plane [...]

Yes, that was what I had in mind.

bq. would not be able to provide visible point coordinates

That would be a necessary feature in many cases.
For example, I seem to recall that you mentioned the like of facet objects that 
would also carry additional (user-provided) information.  If this information 
is "color", it is needed in order to draw scene as would be seen from the 
specified viewpoint.


> 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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