Shape
drag along left half to draw silhouette
click=add · drag anchor=move · drag handle=curve · shift-drag handle=break · right-click=remove
top view · ring 3 @ y=0.55
click=add anchor · drag handle=curve · shift-drag handle=break · right-click=remove
Experimental
front · X(Y)
side · Z(Y)
top · X(Z)
drag in each panel · voxel solid iff inside all 3