transform.origin.y by mouse movement not working?

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transform.origin.y by mouse movement not working?

quickben

I have set up a camera with a look_at constraint targeted at a helper node (parented to a SpringArm3d, which in turn is child of a characterbody3d). Oribiting around the player by using x-mouse motion works fine, but when I try to move the camera up via y mouse motion, it just jitters around, clearly trying to move but being moved back (?). For testing purposes, tried to move the node via mousewheel input up/down, and this works without a hitch. I also tried moving the bodies as top_level, and via global_transform.origin.y, which gives even more trippy results 🙂

Any suggestions as to what I'm doing wrong would be very welcome!

	if event is InputEventMouseMotion:
		$"../..".rotate_y(-event.relative.x * mouse_sensitivity)
		$"../..".transform.origin.y = -event.relative.y * mouse_sensitivity * 10

cybereality

You have to move the object, right now you are setting it equal to the mouse delta.

$"../..".transform.origin.y -= event.relative.y * mouse_sensitivity * 10

quickben

cybereality

thank you very much, that solved it!
To be honest though, I don't quite understand why. What's the difference between
transform.origin.y = -event.relative.y
transform.origin.y -= event.relative.y
?
You pointed out that I should move the object, but doesnt' transform.origin do just that?

quickben

nevermind I figured it out. Cerebral knot on my part 🙂
thanks again!

Kojack

event.relative is how far the mouse has moved since the last update. So it's an offset, not a position.
Let's say you are moving the mouse at a fixed speed. relative.y could be a value of 5 (I don't know what range Godot really returns, lets just pretend it's 5 as a hypothetical).
So every event.relative.y is 5 while you carefully move the mouse at a fixed speed.
If you do transform.origin.y = -event.relative.y then transform.origin.y will be set to 5 every time. It never moves.

But if you do transform.origin.y -= event.relative.y then transform.origin.y will be 0, then -5, then -10, then -15, etc. It keeps changing position.

Also = - means overwrite the value on the left with the negative of the value on the right.
-= means modify the value on the left by subtracting the value on the right from it

quickben

Thanks for taking the time to explain this in detail. Much appreciated!