............................Figures


Figure 1-1 XGL API and Foundation Library	4
Figure 1-2 XGL in the OpenWindows Environment	5
Figure 1-3 XGL Class Hierarchy	6
Figure 1-4 System State and Generic Operators	7
Figure 1-5 Overview of the Device Object	8
Figure 1-6 Context Object Operators and Attributes	9
Figure 1-7 Overview of the XGL Color Models	10
Figure 1-8 Transformed Geometry	11
Figure 1-9 Line Pattern Example	11
Figure 1-10 Overview of Light Sources	12
Figure 1-11 Marker Examples	13
Figure 1-12 Texture Mapping of a MipMap to a Polygon	14
Figure 2-1 XGL Directory Structure	17
Figure 2-2 XGL Answerbook Directory Structure	18
Figure 3-1 High-level View of an XGL Application Program	28
Figure 3-2 Using DGA to Render Locally	29


Figure 3-3 XGL and Remote Rendering	30
Figure 3-4 Instantiated Objects	35
Figure 3-5 Output of `hello_world.c`	38
Figure 5-1 Output of `ow_olit.c`	79
Figure 5-2 Output of `inq.c`	99
Figure 6-1 XGL Color Pipeline	107
Figure 6-2 RGB Color Cube	120
Figure 8-1 XGL Drawing Primitives Illustrated	146
Figure 8-2 Context Attributes Pipeline	176
Figure 8-3 Output of `prims_2d_pgon.c`	178
Figure 8-4 Output of `prims_2d_rect.c`	180
Figure 8-5 Output of `prims_2d_circle.c`	183
Figure 9-1 NURBS Curve Control Points and Bounding Polyhedron	205
Figure 9-2 NURBS Curve Knot Vector and Parameter Range	207
Figure 9-3 NURBS Curve Metric and Chordal Approximation Criteria . 210
Figure 9-4 Output of `nurbs_bezier.c`	212
Figure 9-5 Output of `nurbs_circle.c`	216
Figure 9-6 Untrimmed NURBS Surface	225
Figure 9-7 Trimming Curves in Surface Parameter Space	226
Figure 9-8 Trimmed NURBS Surface	227
Figure 9-9 Output of `nurbs_sphere.c`	234
Figure 10-1 Output of `tran_2d_orig.c`	252
Figure 10-2 Output of `tran_2d_transl.c`	254
Figure 10-3 Output of `tran_2d_rot.c`	256
Figure 10-4 Output of `tran_2d_scale.c`	258


Figure 10-5 Output of `tran_3d.c`	261
Figure 11-1 2D View Model	268
Figure 11-2 3D View Model	269
Figure 11-3 VDC Orientation	276
Figure 11-4 Output of `view_perspect.c`	280
Figure 12-1 Text Local Coordinate System	290
Figure 12-2 Annotation Text and Leader Lines	292
Figure 12-3 Character Height	295
Figure 12-4 Character Spacing	296
Figure 12-5 Character Up Vector	297
Figure 12-6 Character Slant Angle	298
Figure 12-7 Text Path	298
Figure 12-8 Internal Reference Lines of a Character	299
Figure 12-9 Examples of Text Alignment	300
Figure 12-10 Text Extent Rectangle	304
Figure 12-11 Output of `stroke_text.c`	308
Figure 13-1 Predefined Line Patterns	316
Figure 13-2 Line Pattern Array Formation	319
Figure 13-3 Balancing Line Patterns around a Line Segment Midpoint	321
Figure 14-1 XGL Predefined Markers	334
Figure 14-2 Output of `prims_2d_marker.c`	338
Figure 14-3 Output of `prims_2d_umarker.c`	340
Figure 15-1 Output of `pick_2d_prims.c`	349
Figure 16-1 Scaling Factor Applied in Scaled Depth Cueing	373
Figure 17-1 Gcache NURBS Curve and Surface Representation Modes	403


Figure 17-2 Output of `gcache_nsi_pgon.c`	405
Figure 17-3 Output of `gcache_complex_pgon.c`	407
Figure 18-1 Polygon with Texturing	437