I'm creating an app using RealityKit and I'm having trouble rotating an element around the Z axis.
The element is an eyelid - which is essentially a sphere cut in half. My hope is to update the Z axis so it rotates. But no matter what I do, it does not move at all.
I am able to successfully rotate it around the x and y axis. But the z-axis seems to be stuck.
robot.topLidL?.orientation = simd_mul(
simd_quatf(angle: deg2rad(-80 + (130 * eyeBlinkLeft)), axis: [1, 0, 0]), // this line handles the blinking as expected
simd_quatf(angle: deg2rad((130 * browLeft) - (60 * browInnerUp)), axis: [0, 0, 1])) // this should rotate the eyelid around the z axis but it does not move at all.
I get 0 movement at all around the z-axis. I confirmed that I am getting values from browLeft and browInnerUp. I looked at the assets in Reality Composer and all looks well. An interesting note is if I change the Z value in Reality Composer, I do see the rotation in Composer as I would expect. But when I hardcode that value in my code, it still doesn't change rotation position.
I also just tried
robot.topLidL?.orientation = simd_quatf(angle: deg2rad((130 * browLeft) - (60 * browInnerUp)), axis: [0, 0, 1])
and that doesn't work either. I even just hardcoded:
robot.topLidL?.orientation = simd_quatf(angle: deg2rad(50), axis: [0, 0, 1])
And even that didn't cause any change.
Simply put, I'm getting no movement at all around the z-axis.
Do you have any ideas why this might be the case?
Additional code:
private func deg2rad(_ value: Float) -> Float {
value * .pi / 180
}