Problem with shadow

Not so long time ago I faced with some strange problem. All objects, which don’t cast shadows, skip shadows from other objects. Is there any way to fix it? I tried all kind of light sources and all kind of meshes, but it is useful. I really don’t know why it’s happening…

This seems like expected behavior. Objects, that don’t cast shadows will not receive shadows either.

Can I make them to receive shadows and don’t cast shadows
?

Can anyone help?

It depends on what kind of shadows you talking about(static or dynamic) and other minor factors. There are certain challenges about that. What kind of effect are you after? Sometimes there is a better solution than the most obvious one

My platform is static and objects on it cast dynamic and static shadows. So I want all shadows from these objects don’t go through that platform.

Objects have to cast shadows only on the platform, not on the floor.