Raycast is not restricting by other layer collider

Question

I have converted my project to URP and suddenly I found the situation where my Raycast code even is working beneath the collider (other layer colliders):

if (DisplayMessage.Click && Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 1000f, layermask))

I corss check the signature of raycast it is fine and the collider it self. Is there any changes in URP? Here is the way i am setting the layer:

int layermask => LayerMask.GetMask("Interact");

Scenario: In my scene, I have a plane (Default Layer) and a cube(Interact layer). The cube is beneath the Plane. But my camera Detecting the cube on mouse pointer and bypassing the Floor. The raycast should acctually not work if there any object of the desired layer.

Answer 1

This is unrelated to URP. That's part of the rendering system, while raycasts are handled by the physics system, and it's the same physics system no matter what renderer you use.

When you give a layer mask to a raycast, you are asking it to consider colliders only on the layers enabled in the mask. Any other layers are ignored - the raycast behaves as though those colliders were deleted from your scene.

So if you want to cast a ray, then check if it hit the layer of your choice (and not an intervening collider on a different layer), you can do it like so:

if (DisplayMessage.Click 
    && Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 1000f)
    && hit.collider.gameObject.layer == interactionLayer) {
    // Do a thing.
}

Here we include all layers in our raycast, so obstacles on other layers can block it. Then, once we've hit something, we check whether it's the layer we wanted to hit. If not (ie. we hit an obstacle on a different layer), then we fail out of the if. Only if we hit our desired layer with no obstacles in between do we enter the body of the if.