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    <p>The page mentioned by Dave K earlier has a number of arcball examples, <a href="http://pv3d.org/2008/11/29/free-rotation-using-quaternions/" rel="nofollow noreferrer">here</a> is one that conforms to the typical physics expected out of a trackball. However you may want to broaden your search a bit and look for quaternions and papervision.</p> <p>If you are unfamiliar with <a href="http://en.wikipedia.org/wiki/Quaternions" rel="nofollow noreferrer">quaternions</a>, they are an element of a 4 dimensional vector-space and the basis behind the arcball effect you are looking for. This <a href="http://www.gamedev.net/reference/articles/article1095.asp" rel="nofollow noreferrer">tutorial</a> will get you up to speed on quaternion math that is fairly easy to understand.</p> <p>Quaternions are handled natively by Papervision so tutorials are not that hard to find. A quick look at google produced the following results.</p> <p><a href="http://blog.zupko.info/?p=150" rel="nofollow noreferrer">Quaternions in Papervision3D</a></p> <p>A <a href="http://www.nabble.com/Basic-Rotation-td18798644.html" rel="nofollow noreferrer">conversation</a> on papervision3d and the dreaded Gimbal lock</p> <p>Finally, a <a href="http://en.wordpress.com/tag/quaternions/" rel="nofollow noreferrer">list</a> of wordpress blogs discussing the topic (not all flash related)</p>
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    1. POArcball Implementation for Papervision3D
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    1. USgodel
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    1. COI don't need quaternion knowledge or arcball examples, I can implement an arcball in my sleep. What I need to know is why it doesn't work on pv3d objects like a cube etc... or an example showing how to make it work on a pv3d object.
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    2. COI guess I'm just not sure of what you're looking for then. You had asked for an example of an arcball in PV3D which a number of people provided, of which I believe http://pv3d.org/tag/quaternion/ has numerous examples. Other than that I don't know how to help you without an example of some sort, all I know so far from your question is that your implementation is not working and goes weird. I guess what I'm trying to convey is that for all I know it could be your implementation that is wrong or you could have hit an edge case but its rather difficult to tell without more specifics.
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    3. CO@godel - The link you provide in the comment does not contain any arcball examples. It contains examples of quaternions. My question is clear, I want a pv3d scene with a cube that can be spun by using a quaternion based arcball. As far as if it's my implementation that is wrong or my implementations application to pv3d, well, that is what I'm trying to figure out. I believe my implementation is ok because it works in DirectX. However, in pv3d it seems to only "attach" to one face of the cube. FWIW, I don't believe your answer is worth an upvote, now had you provided a working example...
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