I'm think 8 is the minimum number of lights hardware must support to be OpenGL compiant, but hardware can support more.<div><br></div><div>Most games use some kind of "light virtualization technique", were any number of lights are allowed but only the closest lights are used for doing the shading.</div>
<div><br></div><div>I'm not sure if the maximum number of lights applies when using custom GPU shaders... </div><div><br></div><div><div><div><div><br></div><div><div><div class="gmail_quote">On Thu, Dec 11, 2008 at 10:14 PM, Conal Elliott <span dir="ltr"><<a href="mailto:conal@conal.net">conal@conal.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">In TBAG, ActiveVRML/DirectAnimation, and Fran, I embedded lights into geometry, which allows them to be spatially transformed. Looking in Graphics.FieldTrip.Geometry3, you'll see a comment placeholder for lights.<br>
<br>
OpenGL is a temporary implementation convenience, so I wouldn't design the API around it. 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> - Conal<br><br><div class="gmail_quote"><div><div></div><div class="Wj3C7c">On Thu, Dec 11, 2008 at 12:52 PM, David Sankel <span dir="ltr"><<a href="mailto:camior@gmail.com" target="_blank">camior@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex"><div><div></div><div class="Wj3C7c">
Hello All,<br><br>I'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'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'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't know yet how to provide this functionality.<br>
</li></ul>Thanks,<br><font color="#888888"><br>David<br>
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