Shadows and transparent objects

Hi, this is all around the web but it does not work on my computer…

I want a transparent object to cast shadows in game engine. Not shadows with an alpha part, but a shadow the opaque object would cast.

I read I just have to select “alpha clip” on object properties, but my PC just does not cast any proper shadow…

My pc is an Intel I3 with ATI mobility GPU

This is what happens:
-first the view mode with an opaque shadow
-second the game engine running.


Uhh…Try with this file:
example.blend (1.19 MB)
PD: the alpha shadows not work in the viewport, only in the game.

… it looks like my GPU does not like shadows… That plane does not cast any shadow.