In TBAG, ActiveVRML/DirectAnimation, and Fran, I embedded lights into geometry, which allows them to be spatially transformed.&nbsp; Looking in Graphics.FieldTrip.Geometry3, you&#39;ll see a comment placeholder for lights.<br><br>
OpenGL is a temporary implementation convenience, so I wouldn&#39;t design the API around it.&nbsp; If more lights get added to a geometry than the current implementation can handle, we can document the limitation and drop some of them at run-time.<br>
<br>&nbsp; - Conal<br><br><div class="gmail_quote">On Thu, Dec 11, 2008 at 12:52 PM, David Sankel <span dir="ltr">&lt;<a href="mailto:camior@gmail.com">camior@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hello All,<br><br>I&#39;m working on adding lighting to the FieldTrip library (ticket <a href="http://trac.haskell.org/FieldTrip/ticket/16" target="_blank">http://trac.haskell.org/FieldTrip/ticket/16</a>). I have some initial data types here:<br>

<br><a href="http://hpaste.org/12975" target="_blank">http://hpaste.org/12975</a><br><br>I&#39;m thinking that the GContext will keep track of which of the 8 opengl lights are used and enable them if they are.<br><br>I was wondering what ideas folks have had with lighting. Some issues that are on my mind:<br>

<ul><li>OpenGL limits the number of lights to 8.</li><li>It would be nice, for a spotlight primitive, to allow the light&#39;s position and a point it is pointing toward to go through different transformations. This would allow a fixed light to follow an object, for example. I don&#39;t know yet how to provide this functionality.<br>

</li></ul>Thanks,<br><font color="#888888"><br>David<br>
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