GLKQuaternionRotateVector3

Question

Created Jun ’15

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I expect the followng code to output (1.0, 0.0, 0.0). Instead I get (0.0, 0.0, -1.0). Does this make sense? Can you replicate this issue?

I'm using XCode 7 and SceneKit, but not explicitly OpenGLES or GLKit.

let glOrienation = GLKQuaternionIdentity

let glDirection = GLKVector3Make(1.0, 0.0, 0.0)

let new_direction = GLKQuaternionRotateVector3(glOrienation, glDirection)

print(new_direction.x, new_direction.y, new_direction.z)

If I start a new project with just OpenGLES or GLKit its works as intended.

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Answer 1

Jun ’15

This issue seems to be specific to iPhone 5 in the simulator.

This works properly on iPhone 5s, and 6/6+.

Annoying issue, but likely pre-release related.

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