Hello all, now this being my second question I hope I provide enough information for someone to help me. I am still working on a top-down space shooter like Asteroids, Geometry Wars, etc. It is odd because my setup isn’t really top down, its an orthographic side-view looking down the Y axis in UE4, most typically the Z axis in any other coordinate system.
The collision seems fine now(first question), albeit I don’t know if I am applying Best Practices.
Rotation; however, is seemingly causing a lot of issues. I am rotating a sprite toward the mouse position here is the blueprint:
As you see I am using atan2 to get the proper rotation degrees from the player to mouse, flipping it then adding an offset of -90 degrees to get the correct orientation. I found it odd that I had to rotate the Pitch to make it rotate the way I wanted (VERY ODD) I would expect the sprite to spin on the left-right axis causing it to spin forward/backward.
I assumed I would have had to rotate the Yaw, which should be pointing right at the camera and in the direction the cam is facing, to rotate left and right. However, when I rotate on the Yaw it acts like it is the Up vector which is the Z vector (which makes it roll)…and if I rotate the Roll it does nothing to the sprite!!!
Does the local axis of a paper2D sprite change to be a normal X(left-right) and Y(up-down) with Z pointing away/to the cam? Or does it remain just like the global axis of X(left-right) and Z(up-down) with Y (foward-back)
I still am trying to reconfigure my way of thinking with swapping the Y and Z axis while using UE4 and this rotation seems to be compounding confusing results.
I am then moving my player in the forward direction (which is apparently the X axis of the sprite) :
What is happening is the axis are being flipped negatively. So by default the forward vector is pointing to the right. When I push my MoveUP axis it moves in the correct (right) direction. HOWEVER, when I move my mouse to the left-side and make the sprite rotate 180 degrees the sprite gets flipped but the forward still points RIGHT.
I debug the forward vector with velocity to determine if my sprite was really moving in its forward and it is indeed. You will notice it is going from 0 to -0.
Do sprites get rotated on the Y and Z by a negative offset (180) to handle rotation on the X axis above 90 and 180 degrees?? What is happening!?
It is tough to tell from the picture but my sprite moves right as it is facing left:
