Endpoints of raycast

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cuppajoeman

Hi there,

I'm creating a multiplayer game using godot4 beta 10, and I have some hitscan weapons, if we take the sniper rifle for example, whenever a player takes a shot I'd like to get the point at which this hitscan ray intersects something, if it's not intersecting, then I'd just like to get the endpoint.

If intersecting, then ray.get_intersection_point() works well, as it retruns the place that was hit in global coordinates, when the ray is not intersecting, this method doesn't return the endpoint, but I believe just the closest point on any node to the ray.

In the case where the ray is not intersecting I found that we have target_position available to us, which looks similar to cast_to in previous versions of godot. The thing is that target_position is always a relative and thus un-rotated vector3.

Note that my goal is to get the endpoint of the raycast in global coordinates.

From here was able to get the global_rotation of the view of the player (where the ray eminates from), but I'm unable to apply this rotation as it's in euler angles and there is no method in Vector3 which allows for rotation in this format.

I was hoping that I could get some help with this.

Thanks,
cuppajoeman

Megalomaniak

cuppajoeman using godot4 beta 10

That is very old at this point and you should probably update to the latest beta, though the Release Candidate is expected soon^tm

Lethn

Yep, Godot 4 is going through quite a few syntax changes at the moment so even if we help you with that specific version by the time you upgrade a lot of the code will be deprecated, due to changes. Don't know if this is the case in Beta 10 but in Beta 16 intersection code makes use of a dictionary to get things like rotation.

cuppajoeman

Ok, I did follow your hints to upgrade to the newest version of godot, but the beta17 api for raycasts seems the same as it did in beta10.

To make my question even more clear, I simply want to get the endpoint of a raycast wrt to the global coordinates.

Pretty much we still have target_position (in the api) which refers to a relative position with respect to the raycast's origin which defines where the
raycast should be pointing, so if this value was (0, 0, -1) it would just be pointing out of the player by one unit.

That's fine and all, but the player has move and rotated their view (yaw and pitch) since the start of the game, so I'm looking for a method to take the (0, 0, -1) vector
and turn it into the global position in the game.

I know that the general algorithm should be to take the position of the player, then add a rotated (yaw, pitch) version of target_position to that point, but having trouble actually doing that in godot.

Best,
cuppajoeman

TwistedTwigleg

In Godot 3.0 you could use the toGlobal function to take a local position and get the global point (takes scale and rotation into account too). Then you could do something like var global_pos=$raycast.toGlobal(Vector3(0, 1, 0)). It looks like Node3D has the same functionality, so you may want to look and see if you can use that 🙂

cuppajoeman

Hey TwiestedTwigleg, your recommendation worked so well, I was able to get the node which represents exactly where the player is looking and use to_global in order to rotate it correctly and get the correct position.

Thanks so much!