perspective mouse loses follower and orthogonal doesnt look right

jbskaggs

OK I have a 3d obj following my mouse cursor. In ortho works perfectly- in perspective the follower falls behind and cannot be clicked.

Suggestions?

xyz

Seeing some code would be helpful.

jbskaggs

err sorry I thought had the code:

#3d follows mouse	
func _input(event):
	if (event is InputEventMouseMotion):
			if drag==false:
				var camera = CAMERAPATH
				var from = camera.project_ray_origin(event.position);
				var to = from + camera.project_ray_normal(event.position) * 4;
				# Apply the position to whatever object you want (we'll assume a node named "Cube")
				global_transform.origin = to
				global_transform.origin.y = 0

xyz

You'll need to intersect the ray obtained from camera with your ground plane. Either via raycast or simply using Plane.intersects_ray()

jbskaggs

@xyz said: You'll need to intersect the ray obtained from camera with your ground plane. Either via raycast or simply using Plane.intersects_ray()

do you have an example of that. I fixed my problem by adjusting the RAY_LENGTH size. But I would like o understand your solution.

xyz

Changing the length won't fully fix the problem. It may look ok for your current camera setup but may appear off as soon as you change zoom, fov or viewing angle.

If I understood correctly, you want to place objects on the ground where the mouse cursor is. The actual 3d location you're after is the point that represents the mouse pointer perspective (un)projection onto the ground plane.

var ray_origin = camera.project_ray_origin(event.position);
var ray_direction = camera.project_ray_normal(event.position);
var plane = Plane (Vector3.UP, 0.0) # horizontal plane at y=0
var projected_mouse_position = plane.intersects_ray(ray_origin, ray_direction)

jbskaggs

That my friend works like a charm!