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I am of the last generation draftsmen who have first learned to projects by hand and then computer.

The important:
1. Precision
2. Speed

The process:
1. Idea
2. Delineate

Drowing types:
2D and 3D

AutoCAD and SketchUp

Logically seeking the 4th dimension:

- Point

- Line 1D

- 2D Surface

- 3D Volume

-? 4D


Each section gives the above.

For example:

The section line is a point.

The surface section is a line.

Section is a surface volume.

What is it that your section gives a volume?