What is the definition of a normal surface An inclined surfa

What is the definition of a normal surface? An inclined surface? An oblique surface? What are three similarities between using a CAD program to create 2D drawing geometry and sketching on a sheet of paper? What are the differences? List two ways of transferring depth between the top and right-side views. List the six principal views of projection..

Solution

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Oblique Surface:

Surfaces or lines that are positioned at an angle with respect to all the principal planes of projection are oblique. An oblique surface will never appear as an line or as a true size area in any of the principal views. It appears as a foreshorted area in each principal view. An oblique line will never appear true length or as a point in a principal view. It will always appear foreshortened.

Normal surface:

Every surface that you model is made up of faces. Faces are either triangular or quadrilateral and each face has an inward and outward oriented side. The direction in which a face is pointing is defined by a vector called a normal. The direction of the normal indicates the front, or outer surface of the face.