ZBrushCentral

Question About Rescaling a 3D Object on the Z Axis

Greetings,

I’m a newbie trying to develop some reasonable understanding of how objects occupy 3-dimensional space in ZB 3.5r3 . Responding to an earlier post, aurick provided some assistance by explaining: “…you’ve already discovered the Transform>Info sliders. Those sliders return values based upon the current mode (Move/Scale/Rotate). When in Scale mode, that returns the radius of the object in pixols.” To explore that, I drew a 3d cylinder and rescaled it on the x, y, and z axes, using the Info sliders. The results are illustrated in the attached file. Deformation along the x and y axes is as expected. What puzzles me is that increasing the size of the cylinder along the z axis increases the length (like increasing the size of the y axis) rather than the radius. If anyone can take a look at the attached file and explain what happened, I would appreciate it. Note that perspective was turned off. These are orthographic views.

It seems to me that doing a 2.5d illustration in ZB is not so much like traditional drawing as like creating a stage set. To do that, it’s helpful to be able to determine the size of objects relative to the size of the stage (the 3d space). The Practical Guide addresses that only to explain that the z axis defines a space between the front plane, the back plane and a canvas plane (at midpoint). If there are any links to further explanations of how to place objects in 3d space, please let me know.

Thanks,
DocPit

If you look at the Tool>Preview window you will immediately see the model’s axes. X is right-to-left. Y is up/down. Z is toward/away from the camera.

With the cylinder the Z axis is not the mode’s radius. It is line through the model’s poles. So when you change the Z axis you will change the length of the cylinder. The X and Y axes together affect the model’s diameter.