torpid lotus
Given an orthogonal camera set to 45 degrees to display an isometric perspective, I need to calculate the shooting direction based on where the mouse position is relative to the player.
The end results is a Vector2D because I only care about the direction on a 2D plane, that direction should point at the mouse position, it's important that vector will make the resulting bullet will pass under the mouse pointer, if it's not moved.
I have absolutely no idea where to start on this
high vessel
were you able to figure it out?
torpid lotus
Nope
reef hinge
is there Actually a rotated 3d camera involved or is this a question about 2d?
in 3d, you could raycast from the camera to a plane that represents the floor
and then do the vector math in that respect
torpid lotus
The camera is looking down at 45 degrees
reef hinge
the 3d camera is looking down at 45 degrees?
(I think that's what you mean, but it's good to get specific early 😄 )
torpid lotus
Yep it's a 3D camera, oerographic
Oerographic
Ortogrwpgi
Ortographic
Sorry phone
reef hinge
one of those.
Anyway!
camera.project_ray_normal and project_ray_origin let you place a ray shooting from the camera into the world
torpid lotus
There's other geometry in the way though
reef hinge
you can take this shot and collide it with a ground plane https://docs.godotengine.org/en/stable/classes/class_plane.html#class-plane-method-intersects-ray
so that figures out where the mouse would be in the plane, without accounting for anything it'd hit on the way there
(which is I think what you want? You can do an actual raycast if you want to account for collision bodies in between)
this lets you get the point_this_made-point_player_at vector the bullet should traverse
(it's a vector3d, but you can do Vector2(that.x, that.z) if you really want :-D)
torpid lotus
Hmm I'm not sure I get it
reef hinge
which step lost you?
torpid lotus
Wouldn't the raycast also hit other level geometry?
reef hinge
no, look at the method I suggest you use
it's just a mathematical intersection ray<->plane
(where tbc the plane is the Plane with normal=Vector3.UP at d=point_player_at.y, equiv to point=point_player_at)
torpid lotus
I'm completely lost
reef hinge
haha! I'm still here!
torpid lotus
And it's not helping that it's late at night
So I cannot really concentrate on this
reef hinge
ok. But it is just math (, and code), and so it is pretty solvable when you get a chance!
torpid lotus
I'll try to read it up in the morning and ping you if I have issues
reef hinge
I'm happy to try to expand on any of the steps!
torpid lotus
Thanks for the help
torpid lotus
I did it, going to post the code in a minute
public partial class MouseAimProvider3D : Node3D, IMouseAimProvider
{
private Viewport _viewport;
public override void _Ready()
{
_viewport = GetViewport();
}
public Vector2 GetMouseAimInput()
{
var mouseWorldPos = GetMouseWorldPosition(this.GlobalPosition.Y);
var direction = (mouseWorldPos - this.GlobalPosition).Normalized();
return new Vector2(direction.X, direction.Z);
}
public Vector3 GetMouseWorldPosition(float planeHeight = 0)
{
var mousePos = _viewport.GetMousePosition();
var rayOrigin = CameraController3D.Instance.ProjectRayOrigin(mousePos);
var rayDirection = CameraController3D.Instance.ProjectRayNormal(mousePos);
var plane = new Plane(Vector3.Up, planeHeight);
var intersection = plane.IntersectsRay(rayOrigin, rayDirection);
return intersection ?? Vector3.Zero;
}
}