It’s a complex matrix with a bunch of rotations too. Usually a matrix multiply is a single instruction on GPU, which is why I said it’s faster than a bunch of vector math. It’s also cleaner.
But if UE don’t give access to those in materials, I’ll just do the same math manually. I was mostly curious here.
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It’s not single instruction. All modern gpu’s are using scalar architechture so its more like dozen instruction. Matrix would be simpler tought. You can make Custom node that does native matrix multiplication. Only problem is that UE4 only support scalar and vector parameters. So you would need still reconstruct matrix.