Solid Modeling

Solids are created from primitives or curves where their shape is modified by adding or subtracting material in the form of other solids or modification features.

In the example below, the shape of object 3 is defined by subtracting the volume of the smaller unit from the larger unit.

Using Subtract Solid to subtract the volumes of the units

In the example below, the shape of object 2 is produced by extruding the curves shown in object 1.

Using Extrude to create a solid of a profile (curves)

Both examples above are solid objects and their shape can only be modified by changing the volume of the solid, either by adding or removing material from the primitive.

[](https://www.tricad.co.za/2020-1/SharkCAD/Videos/solid from primitives.mp4)