Is there documentation on how scale relates to size parameters of basic mesh objects?

[system]

	Attention	Topic was automatically imported from the old Question2Answer platform.
	Asked By	alexp

I was playing around with cubes, just trying to put them in a series of contiguous rows. I made a scene called TerrainBlock that is just a cubic MeshInstance with scale (1,1,1). I would have thought that the side length is 1, so adding 1 to one axis of the previous cube’s position would put them adjacent to each other, but what I observe is that the cubes overlap. Putting them 2 apart seems to achieve the desired effect. It seems like the scale refers to a “radius” (i.e. half side length) in each dimension, but that was unexpected.

Is there any documentation about how the other primitive meshes are parameterized?

[system]

	Reply From:	jgodfrey

I’m not aware of any explicit documentation that describes the default primitive mesh objects in any detail (might be good to have). However, you can easily throw a few such objects into a scene an take a look at the results of something like the following, which should be the size of the bounding box for the specified item.

print($MeshInstance.get_aabb().size)

When the above MeshInstance is the default CubeMesh, the result of the above is indeed [2, 2, 2] as you note above.

Additionally, there is some basic 3D unit info on this page:

Introduction to 3D

(though, again, not specifically the details you’re asking about).