generate raycast thru script

DJM

how do u generate a raycast thru gdscript? and also how to apply slightly random spread (shooting weapon)?

cybereality

There is some code on this page that might help. https://docs.godotengine.org/en/stable/tutorials/physics/ray-casting.html

But for many things, it will be easier to use a RayCast node and place it on the gun barrel and set it up in the editor. You can still alter the properties with code, but it makes it easier to see what is going on.

In terms of random spread, you probably want to use a single ray cast (as I said, with a RayCast node pointing straight from the gun) find the collision point, and then spawn an Area or other collision shape that is about the size of the spread. Or you can take the collision point and just generate some other vectors in code that are randomly close to that point. This works for a single object.

If you need to account for multiple enemies or objects it gets a little more complex. There are many ways, but you probably don't want to fire 100 ray casts to simulate a buck shot. Though I guess if you limited it to say 5 or 10 rays (with random offset) that should be doable.

DJM

lets say i want 8 raycasts that spread over distance. do i really need to make a raycast node for all 8 ? there must be a way to set the amount of rays thru script and also the direction to point to

cybereality

Yes, you can set them through script, it is shown on that link.

DJM

im trying to do it by code, like the example page it errors ,non existant function "intersects_ray" in direct space state 3d is this changed in godot4?

func firebullet():
	var space_state = get_world_3d().direct_space_state
	var result = space_state.intersects_ray(self.transform.origin, -self.global_transform.basis.z)
	if result:
		var collider = result.collider
		#var n = result.normal
		var p = result.position
		
		#var impact = impact_normal.instantiate()
		#collider.add_child(impact)
		if collider is RigidDynamicBody3D:
			collider.apply_impulse( p - collider.transform.origin ,- self.global_transform.basis.z * force)

fire7side

It shows up in the docs for 3.4, Are there any docs for 4? Anyway, it's just ray.get_collider() and ray.get_collision_point. Just rewrite it with a raycast instead of direct_space.

DJM

the docs of 4 dont show anything else. i dont want to setup a raycast node, i want to create raycast thru script

fire7side

You can create any object with the new keyword.

var ray = RayCast.new()
addchild(ray)

You have to position the translation and then set the end point also. By default, it's created at the position of the parent.