how to instantiate object on certain positions geometry nodes?

Question

I have the following setup, the plane rectangular thins is road, the the scattered object is grass, the following is the node setup, if I don't want like the instances of grass to appear where there is the road I have made, why can't I use this setup (edited)

the road has x y z coordinates positions right, if I can take the position attribute of the road(specific values of the road), and then on the selection of the distribute points on faces I should be able to say distribute points on all the positions besides those specific x y z position of the road correct? That setup doesn't seem to work and only one that works as intended is the geometry proximity node setup, but I was wondering what was wrong with the initial setup I had

Answer 1

If you want to finish your solution, it should look like this:

Here first the positions of the faces of one mesh are transferred with Transfer Attributes, and then compared with the positions of the other mesh. If these positions are congruent, a face is selected.

However, since here positions of faces are compared, it can come with this solution to the problem that nevertheless points are produced on faces, which protrude into the road.

Therefore I would solve this with the node Raycast:

Here, after the node Distribute Points on Faces, each point is compared to the mesh below it. If a raycast (the "ray") sent downwards hits a mesh, then a selection is generated. This selection is used to remove the points that are directly above the road.

_{(Blender 3.1+)}