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Prevent Camera Flip on [-90,90] rotation

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So i'm using the html5 deviceorientation API to get device euler rotation values alpha, beta, gamma, and I want to use the gamma value to rotate a webgl scene on my phone.  The scene rotates fine when I move the value within that range. However, once I go beyond -90 for example (happens when I point my phone upward), the next gamma value I get is 89. This has the effect on making the scene suddenly flipping and looking down instead of 1 more degree upwards. 

Question is. Is there a way to normalize the value such that the jump from -90 to 89 is treated as looking 1 more degree upwards ?

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I am not sure what the value "gamma" is supposed to represent, but perhaps you can figure that out and then compute your rotation in a more direct manner, skipping the Euler angles altogether. Code that uses linear algebra instead of angles is generally simpler and more robust.

 

Edited by alvaro

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I looked at the documentation for the deviceorientation API.  You won't be able to use gamma alone.

I think you're going to have to use alpha, beta, AND gamma to construct complete rotation information.

I found this which might help, if you understand the math he's using:  https://stackoverflow.com/questions/36639182/html5-get-device-orientation-rotation-in-relative-coordinate

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