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Unreal Engine to move to using Y-up (midwest.social)

submitted 1 week ago by Justdaveisfine@midwest.social to c/gamedev@programming.dev

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[–] AnarchistArtificer@lemmy.world 2 points 1 week ago (1 children)

I don't think that's right. The post that you linked to includes this link, which includes this snippet:

"First, instead of labeling coordinate axes with X, Y and Z, we're introducing more descriptive axis names:

Left (was -Y)

Up (was Z)

Forward (was X) "

[–] Philippe23@lemmy.ca 2 points 1 week ago* (last edited 1 week ago) (1 children)

I don't follow why that means I'm wrong.

"Was" here refers to their old Z-Up, left-handed coordinates, where X was forward, Y was right, and Z was up.

[–] AnarchistArtificer@lemmy.world 2 points 1 week ago (1 children)

You're right that I didn't sufficiently consider the "was" in that sentence. Perhaps there's something I'm missing though, because I haven't seen anything that would suggest X is left. When I put my right hand in the position indicated in the OP, my index finger (Y) points upwards, with my thumb (X) pointing right, making an L shape. My middle finger (z) comes out towards me.

However, most of my experience with coordinate systems is with abstract, mathsy stuff, and I don't have much experience with any of these softwares; there may be something obvious that I'm missing.

[–] Philippe23@lemmy.ca 1 points 1 week ago* (last edited 1 week ago)

You can spin your hand 180° around Y (index / up). Then Z (middle) points away from you, "forward". And X (thumb) will point left.

Thus the "Left-Up-Forward" + Right-handed.