Coordinate of Trimesh vertices

[lix4]

I have noticed the coordinates of trimesh vertices have both positive and negative floating number. And they seem to be between -1 and 1. I would like to ask when renderer renders picture. It follow the equation: (x, y, 1) = intrinsic@extrinsic@object_pose@(X, Y, Z, 1). When rendering images, does render demoralized vertices coordinates?