O

OBB and orthogonal frustum intersection, 624–626
caching intermediate results, 626
defined, 624
separating axis test, 625–626
objects
2D, in plane, 331–333
intersecting, 6
nonintersecting, 265, 266
projections, 266
queries, 1
squared distance between, 1
See also specific objects
oblique projection, 160–162
defined, 160
direction, 160
edge-on-view, 162
illustrated, 161
matrix representation, 162
See also projections
octahedron, 348–349
illustrated, 346
relationships, 347
vertices, 348
See also platonic solids
one-to-one maps, 46, 48
onto maps, 46, 48
open meshes, 342
open polylines, 178, 229
optimal partitioning, 791–798
canonical triangulations, ...

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