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    <p>Not exactly a straight answer to your question, but perhaps you find this relevant. </p> <p>Have you considered constructing a BoundingBox object and use the Intersects(Ray)? <a href="http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.boundingbox.intersects.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.boundingbox.intersects.aspx</a></p> <p>Edit 1: It's how I usually do it. Depending on your data structure, it might also be easier to optimize (if you construct larger bounding boxes to bore into for example).</p> <p>Edit 2: As per Niko's suggestion: I don't want to post the relevant code (because it's a couple of pages long in total to make the context make sense) from the samples, but I can point you to the parts that you'll be interested in.</p> <ol> <li>Download the sample from <a href="http://xbox.create.msdn.com/en-US/education/catalog/sample/picking_triangle" rel="nofollow">http://xbox.create.msdn.com/en-US/education/catalog/sample/picking_triangle</a></li> <li>The bottom of the Cursor.cs file contains what you already know, calculating the Ray</li> <li>Go to the Game.cs file. There you'll find UpdatePicking() which calls RayIntersectsModel(...) which calls RayIntersectsTriangle(...)</li> </ol> <p>The transform of the Ray is this part:</p> <pre><code>Matrix inverseTransform = Matrix.Invert( modelTransform ); ray.Position = Vector3.Transform( ray.Position, inverseTransform ); ray.Direction = Vector3.TransformNormal( ray.Direction, inverseTransform ); </code></pre> <p>How deep you want to go (how accurate your picking) is up to your needs of course, but there you have it.</p>
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    1. PORay intersection with 3D quads in XNA?
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    1. COUnfortunately, `BoundingBox` is axis-aligned, which means it doesn't rotate as his `Quad` could.
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    2. CO...which really is very trivial to get around, simply by transforming the ray. It's all demonstrated in these two samples if you're interested: http://xbox.create.msdn.com/en-US/education/catalog/sample/picking_triangle and http://xbox.create.msdn.com/en-US/education/catalog/sample/picking
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    3. COHey, that's great - if you could edit the answer to include a working sample it would most likely get accepted!
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