Hi,
Well this feature, cast shadows, is not currently supported in the Mac version of the 3D Objects filters … but there is a workaround. You’ll need to do this:
• duplicate the layer with the 3D object
• position this below the original 3D objected filtered layer and above the shadow catcher layer
• precomp the duplicated layer
• set the duplicated layer to 3D by clicking on the 3D icon in the AE timeline for that layer
• the shadow catcher layer should also be a 3D layer
• add a light to the scene
• set the duplicated layer to cast shadows
• set the shadow catcher layer to receive shadows
• in the light, tweak the shadow options to obtain the desired result
If you would like an AE CS4 project that better illustrates this, please email me at peterm@borisfx.com and I’ll send that your way.
Cheers,
Peter.