Back face detection technique
Describe the Back face detection technique in short? Also describe its features?
Expert
a) Fast and easy object space technique.
b) For recognizing the back faces of the polyhedron.
c) Mainly based on inside-outside test.
d) Use plane parameters A, B, C, D: Ax +By+ Cz +D < 0
e) Inside point is all along the line of sight to surface: V.N = Vz C
f) The polygon is back face when C < 0
g) Polygon can’t see on any face when C = 0
h) The Z component value: C <= 0
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