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618 | Chapter 21 Surfacing Wireframe Models
In general, use only smooth wires to create surfaces. When you use a wire
with sharp corners, those sharp areas do not produce an acceptable surface.
You need to find some other way to surface the area. Consider the design
intent again. A second look at the area reveals a flat surface on the front of
the pump housing that intersects a smoothly curved surface at the bottom.
How do you know that the front surface is flat? One way to check is to look
at the top line in another view. The approach to surfacing that area is to cre-
ate the smooth bottom surface and the flat surface. Then intersect one with
the other and create a wire at their intersection. If the new wire is the same
as the existing wire, you confirm your observation and surfacing approach.
Next, consider the bottom surface. You already know that you cannot use the
top wire because it has an abrupt corner. A good approach is to use only the
bottom wire as a rail, and the far edge as a cross section.
wireframe unacceptable surface
rail section
surface