memes

Top one is incorrect. Z needs to point outwards.

Thanks to 3D printing Z is firmly “up” in my brain even if the modeler I use does it differently.

One of my friends and I used to always have this debate because of our different backgrounds. I got used to +Y being up because of doing physics for several years and seeing side-on diagrams that needed to account for gravity. My friend has a background in geology, so he's used to top-down surveying maps where +Z is up. It all depends on your perspective.

But my way is right. We need to have standards, people.

In my brain Z is Up, Z is Height. In my job I have to deal with both all the time which is quite annoying.

Yeah... As a Blender 3D artist, Z axis has been baked into my brain as the up/down axis.

I legit had no idea anybody actually used the upper system until now. I had to read the comments just to see whether the upper system was just some sort of joke. I am horrified.

Z is always depth. Both are correct but define different perspectives. Top is looking across the landscape from an arbitrary floating perspective, bottom is looking down with anchored mapping to the surface.

Don't forget the handedness of each coordinate system!

In a 2D game Y is up. Going from 2D to 3D would make sense to add another dimension forward to account for depth.

However if you start with a map of a 3D surface then North is Y and East is X you'd add Z to account for elevation like everybody making maps would.

I guess it depends on how you look at it.

In 2D Y is up, in 3D Z is up.
X is always red🤷‍♂️

My son and I have had this very argument. I think the top one is right as he thinks it's the bottom one. I have a coding background and he has a 3D printing background. I figure that's why we're different but I know nothing about 3D printing beyond the cool stuff I see on the Internet and things he's printed for me.

The second fellow is a machinist, like me.

There are clearly more than two. In the top image that z-axis is pointing in the wrong direction.

I hate this so much in the 3d printing world. I want it to graph from the angle I'm watching it, not from the angle the nozzle is.

I'm the bottom person. X and Y need to be on the same plane.

I've never heard of Y pointing up. Z is always up. Unless you're talking about lathes, where Z points to the right and X points up. Whoever came up with that, I hope his frying in hell.

I am the latter, because if I draw a X-Y plane and lay it on the ground, it aligns with that XYZ reference frame.

Using left-handed coordinates systems is just mean!

X across, Y to the sky, Z towards me

Everything else is wrong fight me

x in red and z in blue please..., this is difficult to look at. My conventions !

I have nothing against y pointing up, but I loathe the fact that left-handed coordinate systems are somehow considered an ok choice. This is probably the strongest I feel about something so inconsequential but I'll die on that hill.

Right hand rule

<i,j,k> vector master race.

Unless you're into magnetic resonance and use rotating frames:

collapsed inline media

If I were to make a thing where I got to decide which one is which I'd pick the 2nd.

I don't have a strong opinion and I'll just pick whatever the default is.