Index 893
Triangulation, 600, 601, 602, 603, 604, 626,
627
angle-optimal, 724
angle vector for, 724
Coxeter, 627
deviation criterion, 600
local, 627
monohedral, 627
of planar point set, 724
size criterion, 600
Triangulation algorithm
for y-monotone polygons, 718, 719
via locally isometric approximations,
605
Triangulation problem
for planar regions, 605
Tricubic parametric solid, 178
Trim curve, 674
Trimmed surface, 596, 598
Trimline
for blending surface, 679, 681
Trimming, 638, 642
Trimming algorithm, 599, 600, 601, 603,
604, 606, 611
Trimming curve, 598, 599, 600, 614, 674
Tripod 6-connected line algorithm, 365
Tri-stimulus theory of light, 297
Trunc function, 817
Truncated cone, 476
Truncated power function, 404
Tunnel
in discrete 3d set, 362
Turning point, 71, 86, 87, 641
of intersection curve, 570
Twist vectors, 496, 499, 533
Adini, 499
Two-point perspective, 118, 136,
Typeface, 109
U
Umbra, 320
Undecidable set, 219
Undercut
of NC cutter, 639
Undersampled, 45
Undoing
an editing operation, 222
Unfolding map, 661
Unfolding of set, 661
Uniform B-spline matrix, 414
Uniform subdivision, 178
Unit cube, 815
Unit disk
closed, 816
open, 816
Unit quaternion integral curve, 650
Unit sphere, 816
Unstable system, 798
Up direction, 113
Upper halfplane, 815
Upper hemisphere, 816
User representation, 163, 192
informal issues, 164
Uv-monotone region, 599, 600
V
Valid representation, 161
Validity problem
for representation schemes, 162
of boundary representation, 166
of CSG representation, 169
of Euler operation representation, 171,
173
of feature models, 195, 196
Vanishing point
of line for view, 118
Variation diminishing property, 430, 502,
505, 514, 544, 547
Variational constraints, 377
Variational method
for FEM, 748
Variational model, 192
versus parametric model, 193
Vatti polygon clpping, 70, 71, 98, 106, 108,
606
VE, 685
Vector
transforming, 259
Vector field, 36, 177, 756
along curve, 462
normal to curve, 462
relatively parallel, 463
tangential to curve, 462
Vector product
of quaternions, 759
Vernier acuity, 45
Vertex, 641
of convex set, 714