GLGE: drop shadows

I'm keen on webgl and GLGE framework. I can't make my cube drop shadow onto a plane. I've copied the definition of light from GLGE shadow demo and I sti开发者_JAVA技巧ll don't see shadows.

What should I take into account to make objects drop shadows in GLGE?

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I've found out that the script used by http://www.glge.org/demos/newshadow/ is different from one in 0.8 release.