Problems with applets that contain Java3d on Mac OS Lion and Snow Leopard

I use Mac Lion OS, and when I use applets with java3d components, the graphics do not appear, however after you “travel” with a terminal window (for example) in front of the browser where the applet with java3d is displayed, and use the control mission ... you can see the graphics.

(This phenomenon occurs with several poppies with a lion and a snow leopard)

In this example, I used the following link: http://www-evasion.imag.fr/~Francois.Faure/enseignement/ressources/java/demo/java3d/Text3D/Text3DLoad_plugin.html

Does anyone know how to fix this?

All the best