Points -- for reference and construction of shapes
Curves (lines) - poly curves - multiple curves "lines" joined together
- open curves
- closed curves - Shapes such as circles, ovals, rectangles, etc.. and free form closed shapes.
- (use the f10 key or select "control points on" to edit a curve
- b-spline curves (controls on the outside of the shape) better for 3-d and bezier curves (controls on the line)
Surfaces (planes) - and Poly Surfaces - multiple surfaces joined together that remain a plane
- closed and planer curves (lines),
- they can be shapes such as circles, rectangles, ovals, etc... or complex forms, but they are filled
- "surface to planer curve" tool (in the surface tool bar) transforms closed poly curves to a surface
Solids
- open solids (like looking into an open box and have no volume)
- transform an closed curve to a open solid by selective surface --> extrude curve --> straight
- closed solids (a closed box with measurable volume.) a "real world" shape
- "solid-->extrude planer curve--> straight" transforms a surface to a closed solid
