Why is the position coordinates different from the scale?

Questions & Answers
1

I’m trying to recreate a school map. I have surmised that my map is 105 by 73 units. So I made a plane of that size. Now unity sets the center point at 0,0. But I want to set the center to the bottom left of the plane, relatively speaking. Logically, I thought that I would have to move the object relatively to the right and up(or away?) by half the plane size. So the transform position should be x52.5 and y36.5. But instead, after a bit of trial and error, I needed to use x525 and y365. That’s 10x of what I would use on paper IRL.

Is my math wrong?

Additionally, if I set an object(e.g. wall) to be a child of that plane, why do I need to set the position to 5,0,5 to put it on the corner of the plane? How does that relatively relate to the parent object?

2

Planes are 10x10 units so by making the scale 105x73 you made the size of your plane 1050x730 units.

3

10x10 makes it more useful for vertex lighting, in case you’re using spotlights/point lights. The primitives are just there for prototyping. It’s highly unlikely you would use them for anything in a finished product, nor are you intended to. Unity isn’t a modeling app; the intention is that you bring in all resources from external apps. If for whatever reason you don’t want to use a modeling app to make a 1x1 plane, you can use an editor script like this.

Source: Eric5h5. You can find this thread here

Please mark as correct if it helped