Subtractive Construction - 3D
Subtractive Construction - 3D
Cutting/dividing surfaces and pockets
The last section discussed Additive construction which is adding primitive shapes together in order to create a complex object.
The other method of constructing a complex shape is by subtractive construction. In subtractive construction, we start with a solid primitive and cut and carve out of it like one would when chiseling marble or carving wood.
A quick way to start getting complex forms is to use the edges of our primitive solids as guides to create cuts and slices.
A quick way to start getting complex forms is to use the edges of our primitive solids as guides to create cuts and slices.
Take out a fresh sheet of paper and draw 3 isometric cubes or rectangular solids.
Take out a fresh sheet of paper and draw 3 isometric cubes or rectangular solids.
We are going to divide and cut into one, create pocket cuts, chamfer one, and fillet the last one.
We are going to divide and cut into one, create pocket cuts, chamfer one, and fillet the last one.
Start with a solid
Draw two lines where you would like to start a cut. Make sure that these two lines are parallel to one of the edges of your solid. (See red lines)
Extend the cut into your shape. Be sure to draw lines that are parallel to the edges of your solid.
Complete your cut by drawing in the final lines on the interior of the cut.