in my project if you refer to the first image i post… you can see that i have a lake with a planar reflection on it… but the problem is when i use the planar the grass(Ground), the stairs or other things on the ground become reflective. and it should not… the only way that i can get rid of thereflection is to delete roughness and specular on my landscape material. and it make the landscape not accurate etc… same thing for the stairs. The stairshave a concrete material on it and it must have some roughness and specular on it. The planar relfector need to be reflective only on the water.