I am making a vehicle mod for an older Unreal game. I want the vehicle to be parallel to the surface it is on so it looks more realistic when going up and down hills. The Yaw of the vehicle depends the direction the car is facing and the Pitch and Roll should be determined in such a way that the vehicle remains aligned parallel to the surface. Using Trace() to get the normal of the plane the vehicle currently resides on, how can I determine the proper Pitch and Roll values for the current Yaw value?
UE1 - UT Aligning player to surface
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You can construct a rotator from axis vectors using OrthoRotation. You already have the Z vector, that's the surface normal. By converting the pure-Yaw rotator into a vector you get a facing direction D. Normal(Z cross D) will be your new Y axis vector. Then, Y cross Z is the X axis vector. Pass it all into OrthoRotation and you have the rotation for your vehicle.
Usage hint on the cross product operator and rotator axes:
Use your left hand's thumb, index finger and middle finger. Thumb points upward, index finger forward, middle finger to the right.
Index = X, Middle = Y, Thumb = Z.
Thumb cross Index = Middle.
Index cross Middle = Thumb.
Middle cross Thumb = Index.
Result is in opposite direction if you swap operands.
Usage hint on the cross product operator and rotator axes:
Use your left hand's thumb, index finger and middle finger. Thumb points upward, index finger forward, middle finger to the right.
Index = X, Middle = Y, Thumb = Z.
Thumb cross Index = Middle.
Index cross Middle = Thumb.
Middle cross Thumb = Index.
Result is in opposite direction if you swap operands.
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