Same pic with HDRI for lighting. One with a ground plane and one without.

Noticing that in the HDRI only image, there's no shadow on the ground. Is there a particular trick to making one appear in HDRI-background type scenes?

Only thing I could think of is to make some kind of invisible shader that picks up the shadow, and apply that to a ground plane. Does that sound right? Is there such an invisible shader included anywhere, or is that something I'm going to have to make up on the fly?

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Barbequed Pixels?

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There might be something worth downloading.