Explanation of object space and world space in vex context

 In VEX, "object space" and "world space" are two different coordinate systems used to represent the position and orientation of objects in a scene.

"Object space" refers to the local coordinate system of a specific object in the scene. This coordinate system is relative to the object's origin, which is typically located at the center of the object's geometry. In object space, the X, Y, and Z axes are aligned with the object's local axis system.

"World space" refers to the global coordinate system of the scene. This coordinate system is fixed and does not change, regardless of the position or orientation of individual objects in the scene. In world space, the X, Y, and Z axes are aligned with the global axis system of the scene.

When working with VEX in Houdini, you may need to transform vectors or points from one coordinate system to another. For example, if you want to move an object from its current position in object space to a new position in world space, you would need to transform the object's position vector from object space to world space.