Hello everyone,
I’ve been working for some time on a system where a character can walk on any surface.
The system works well overall, and gravity is correctly computed using line traces.
I’m currently facing a major issue when the character is walking on the ceiling, i.e. when gravity is (X=0, Y=0, Z=1).
On the attached video, I’m only pressing the forward movement input. However, when gravity is set to (0,0,1), the behavior depends on the camera orientation:
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If the camera is facing the X axis, movement works as expected.
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If the camera is facing the Y axis, the controls become completely inverted.
This is not an input issue, but appears to be a reference frame / rotation problem caused by how movement direction is computed relative to gravity and camera orientation.
Technical context:
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Unreal Engine 5.6
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Blueprint only
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Movement is based on Add Movement Input
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I compute a custom rotation using a function called “Get Gravity World Rotation”, which is applied after Get Control Rotation, before being used to drive movement.
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All relevant Blueprints are shown in links below
Question:
What is the correct way to compute a movement direction that remains consistent regardless of camera orientation when gravity is inverted?
More specifically, how should the movement basis (forward/right vectors) be reconstructed when walking on ceilings, to avoid axis inversion issues?
Get Gravity World Rotation Blueprint
Movement Input with Gravity