Raycasting colliders without rigidbodies

[Digitex1]

Hello,

I’ve got a weird issue in a new project: I used to raycast objects without rigibodies from my First-person view rigidbody character controller:

Physics.Raycast(new Ray(camerRayOrigin, transform.forward), out RaycastHit hit, rayDistance, interactLayers,QueryTriggerInteraction.Collide)

However, in my new project this wouldn’t work until I add a rigidbody to the target collider.

has anyone have an idea about what could be the issue?

2/ I thought about adding a KINEMATIC rigidbody to each target collider (they are usually static colliders). But, I wonder what is the performance impact of such solution? I’m targeting low end devices like mobile devices.

Kind regards

[PraetorBlue]

Raycasts should have no problem hitting colliders with or without a Rigidbody. The Rigidbody isn’t really relevant. Maybe share a little more context about what you’re doing here and some more code? For example how is your layermask set up? What layer(s) are the collider(s) you are trying to hit on? Etc…

[Kurt-Dekker]

As Praetor says, Raycasting doesn’t care about Rigidbodies.

Raycasting, colliders, planes, Plane, etc:

(Help)How can i detect how many raycasts are hitting an object?

There are many types of 3D raycasts. One is the generic Physics one: hits anything in the scene Another is one that lives on a collider. If you know which collider you care about, you can use that collider instance to see if a ray hits it. That way you not only know that it hit, but because you are already asking "Did anything hit this collider?" you also know what collider it is. These are some of the types of 3D raycasts: https://docs.unity3d.com/ScriptReference/Physics.Raycast.htm…

Keeping a plain/terrain within the view frustrum

You can get rays from the camera at a given spot, so one approach is to cast rays from the camera corners and make sure they hit your terrain, or hit your terrain bounding box. To ignore screen pixel dimensions and just get the corner rays, this is the API you want: The nice part is that it doesn’t matter how your camera is set, how your field of view is set, etc., It just works. You can use this to raycast and hit physics on your ground using: asks “did I hit any collider in the scene?…

And there is also EventSystem.RaycastAll for raycasting in the UI / EventSystems context.

Raycasting in 2D:

Randomly placing objects near polygon collider 2D

Epoch! I always love your posts because you’re always working on the next thing. Awesome. So for this I would pick a random spot from left to right at the top of your screen, then raycast down to “hit” the terrain and see how high it is at that point, and from that you can emplace your missile above the ground, or on a pedestal or whatever. Remember there are various flavors of Raycast in Physics2D: https://docs.unity3d.com/ScriptReference/Physics2D.Raycast.html “Tell me if I hit any 2D col…

[Digitex1]

thanks for the confirmation, I found the issue, it all comes down to using hit.transform.gameObject instead of hit.collider.gameObject in a context where the target collider is a child of a root object that has a kinematic rigidbody