When drawing circles and ellipses in perspective, it's always tricky to find the right center/degree/rotation for the projected ellipse. With this ruler, all you have to do is align the four corner control points with the projected square or rectangle within which you wish to draw circles or ellipses.
When you move your pen, the ellipse will be adjusted so that it passes through your current pen position, but keeps the original perspective projected center. This allows you to quickly draw perspective correct concentric circles or ellipses.
The entire quad can be moved by using the Move Center keyboard shortcut, or by holding the control key while dragging any of the corner control points.
The yellow edge control points have different behaviors depending on which key you hold while dragging them:
This ruler also has a radial line option and box modes that work the same way as for the Ellipse ruler.
Lazy Nezumi is a trademark of Guillaume Stordeur. Adobe, Photoshop and Flash are trademarks of Adobe Systems Inc. ZBrush is a trademark of Pixologic Inc. Windows is a trademark of Microsoft Corp. Apple and Mac are trademarks of Apple Inc.