Soft contact shadows

Does anyone have any insight as to how to achieve soft contact shadows? Please see screenshot. Its not really an ambient occlusion pass, its like a very blurry shadow projection from straight down. On a high level I’m thinking render the model once from the top, invert the alpha, blur it , then apply the render texture to a plane aligned with the bottom of the model. That said, im not sure exactly how to go about implementing this. I don’t need source (that would be nice however), I just want to know about possible approaches and techniques. Thanks.

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That’s hard to tell on the picture. Maybe it’s an ambient occlusion pass but that would be exaggerated in some ways…