Freya Holmér on Twitter: "I've now added a function for rotating around the 6 primary axes (intrinsic & extrinsic XYZ) by an arbitrary angle, avoiding doing a full quaternion multiplication https://t.co/1P3skkkp0T https://t.co/kFtAUOKpH4" / Twitter

I've now added a function for rotating around the 6 primary axes (intrinsic & extrinsic XYZ) by an arbitrary angle, avoiding doing a full quaternion multiplication github.com/FreyaHolmer/Ma

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Freya Holmér

@FreyaHolmer

Nov 25, 2022

here's an implementation of quaternion swizzling for super cheap 180° rotations in Unity, enjoy

github.com/FreyaHolmer/Ma

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11:35 PM · Nov 25, 2022

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I think I might be doing math as a coping mechanism when dealing with stress in life. it's comforting

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Freya Holmér

@FreyaHolmer

Nov 26, 2022

added 90°/-90° quaternion rotations now as well, since they too can also be simplified quite a bit github.com/FreyaHolmer/Ma

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Have you ever made matrix transformations in 3d space before? I have not dissected quaternions yet enough to know them well but it reminds me of doing that I’m bookmarking this to come back when I have the capacity for attention

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many times yes!

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Waves of Steel releases on February 6th!

@byobattleship

Nov 26, 2022

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@FreyaHolmer

This is neat! Do you have some sense of how much faster it is than doing the full matrix multiplication?

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not sure what matrix rotation situation I would compare it to? this isn't using matrices at all, it's rotating a quaternion along any of its main bases

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Is this a big performance boost? It's still several multiplications, plus some trig functions.

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Code looks good, isn't there are way to make a matrix that would lead to a quick answer ? Curious, there's a sort of 3-d pattern in there somewhere I'm sure... Then again, math is definitely not my forte...

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This makes me want to implement an array-based quaternion that can do in-place zero-allocation operations (though I don't know nearly enough math)

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