mouseListeners in 3d?

[rhys]

Hi guys,

I was wondering if anyone could point me in the direction of how using mouseListeners would work on a GLCanvas. For example, how i might detect if a particular object is being clicked or say, the closest vertice to a click. Basically, if there’s a way to differentiate between the 2D representation of the screen and the 3D depth of the scene when clicking. Or perhaps a way of mapping the co-ords of objects into 2D so you can determine what someone might be clicking on?

Any pointers would be cool,

Thanks

[kbr]

Take a look at the source code for the gleem package in the jogl-demos workspace. This implements a few Open Inventor-style manipulators in 3D. It’s very inefficient but should show you the kind of linear algebra you need to write to get correct results.

[Chris61182]

You can use gluUnproject() to get the depth at a specific pixel.

Or you can look into using picking, http://www.lighthouse3d.com/opengl/picking/ to identify which object was selected.

[gibe]

For the use of gluunproject you may have a look to: http://nehe.gamedev.net/data/articles/article.asp?article=13

Jean-Baptiste