How do I build Shade base on cast by Material but not Mesh ?

I’ve set my material like this , it work fine

But after I build light , the shadow doesn’t looks like it
but the mesh itself , a plane shadow .
how do I do to make material shadow ?

Increase the lightmap resolution of the floor mesh.

Thanks Jacky , but I found that I solve it by reduced lightmap resolution
Anyway it’s helpful !