I've been on a bit of a 3D tangent lately, and with the latest construct release I can now do this little demo: a ball bouncing in a 3D space. Anyway.
1. Collision: Is handled through 2 bouncing balls, one with it's Y axis restricted to the other's. By no means perfect, but produces a nice effect. One ball controls the Y and Z axis, the other controls the X. Would eventually like to figure how to do it with more than walls.
2. Textures made with the Genetica Viewer (Free)
3. Try changing the Eye distance to around 100, it's something a bit different to look at.