Set Actor Rotation depending on Vector

Development Programming & Scripting Blueprint
1

Hey there,
I’m currently struggling on Rotating my pawn according to a given vector in Blueprints.
This Vector represents gravity in my prototype. Normal gravity is represented by Z = -1. Gravity Towards the ceiling would be Z=1, towards a Wall X = 1 /-1 or Y = 1 / -1.
My Custom Gravity is already working, Movement too (except the need of a few additions like not moving in the air, but that’s not part of my problem).

Now I would like to rotate my Pawn accordingly, so it’s feet are facing towards the gravity, but I’m struggling hard understanding how to make a correct rotation out of this vector :frowning:

Here is my current Blueprint: blueprintUE | PasteBin For Unreal Engine 4

Edit:
I Wanted to Add the “Set Actor Rotation” either in the Event Tick, or more likely after the “Trigger Gravity Change” Function

2

If it’s on a character, then you need to use SetControlRotation.

3

It’s for a Pawn. I already tried out “Set Actor Rotation” triggered by a key and by setting a fixed rotation which is working as intended.
But for getting the correct rotation from the vector, I’m still struggling.

4

Thing is, after you’ve rotated the pawn, gravity is always Z=-1, no?

Unless you just rotate the mesh…

5

No, I trigger a gravity change via button, so (x=0,y=1,z=-1) becomes for example (x=1,y=0,z=0)
That is already working, but I need to rotate the pawn correctly, so it looks like the level has rotated around the player

6

Ok, it’s easy, just add local rotation.

If you have the pawn like this:

image

then you can always rotate it to that it’s base is facing the current Y direction with

image
image721×345 37.1 KB

Do you get what I mean?

I don’t know how ‘cubic’ your world is, the code might have to be more subtle…

7

Thanks for that :slight_smile:
Got it working by adding rotation manually to the Pawn, but I had to add a few more things, so also 180° turns when changing for example from (x=0, y=y, z=-1) to (x=0, y=0, z=1) are covered. But I would also like to add more angles, then I can’t work that way. At least not when the blueprint should be still readably.
That’s why I try to achieve to get the rotation out of the vector.

Currently, I change the gravity direction vector by aiming at a wall.
Then it creates a new gravity direction vector by doing a line trace and using the impact normal, which determines the gravity in my level and “pulls” my pawn in the direction of this gravity.

8

Normal of the wall is what I was going to say. Your local Z needs to be the same as the wall normal.

1 Like
9

Ah, now I got what you mean :slight_smile: Thanks a lot :smiley:

Now I’m using “make Rot from Z” with my gravity Vector * -1 and use that rotation with “Set Actor Rotation”.
Alway thought the solution has to be a lot more complex, maybe that’s why my tries never worked :sweat_smile: