ZBrushCentral

How to make a "lampshade"

ZBrush Usage Questions
#1

I am trying to make a thin-walled, inverted cone-like shape to model the curtain of ejecta from an impact crater. Think of the sheet-like curtain of debris sprayed up and out from a bomb detonated just below the surface of the ground. Think of an inverted lampshade.

I’ve tried altering the most natural tool in the standard palette - the 3d cone, but that is a solid 3d shape and I cannot ‘pull in’ the base in a uniform enough manner to create the sheet-like shape I’d like.

Any ideas to help a Zbrush newb?

Dan

#2

Use the ring primitive, initialize it with large radius and make it thin. Then use deformation palette with size and axis you need to drag out the ring to form a hollow cilinder, then try the taper/skew/bend deformations to get the inverted lampshade form or you can make a polymesh out of it, enter edit mode, set transform symmetry to Radial (High number of points , 50) and axis Z. Then select the move brush and fairly large brush size, then you can just pull out the lampshade form out of the hollow cilinder because of the radial symmetry.

If you need debri to be formed , like small rocks being blown away in this shape, you need to subdivide the shape to get some polys to work with, then draw rock like shapes with mask on it, and then you can extract these shapes with the subtool palette to form an actual model of debri.

I’d make a zscript showing the progress, but i’m at work currently and my laptop can barely handle zbrush and I should be working instead of doodling ;p

#3

This is great - many thanks! Exactly what I was looking for!

Dan