VRML Tensegrity Models: Revision History

30	Oct	09	Add Tensegrity Tetrahedron (Pars).
30	Sep	09	New link for Floppy's VRML97 tutorial.
23	Feb	09	Decrease radius of struts in The Empty Chair (Marcelo Pars) from 10 mm to 9 mm per info from Marcelo Pars.
17	Feb	09	Add The Empty Chair (Marcelo Pars).
21	Nov	08	Add 5-Fold Fan Prism.
30	Jun	08	Add Aspension Arch.
03	Jun	08	Change "Aspension Tower" to Aspension Tower (Marcus) to make it clear than Jan Marcus is the author of this design. Re-order aspensions so the towers come first.
22	May	08	Add 8-Stage Zig-Zag Arch.
19	May	08	Add Aspension Tower II and Aspension Canary. Change Aspension Skylon to Aspension Skylon II and refer to another data file. Aspension Tower now refers to data for Jan's original structure, and Aspension Tower II refers to my variation.
10	Mar	08	Add Aspension Skylon.
26	Dec	07	Add Split-Level Prism II and Tetrahedral Prisms. Rename Split-Level Prism as Split-Level Prism I and Diamond-Shaped Tensegrity as Diamond-Shaped Prisms.
07	Dec	07	Revise data files for Wishbone Tensegrity and Diamond-Shaped Tensegrity.
21	Nov	07	Add Split-Level Prism, Wishbone Tensegrity and Diamond-Shaped Tensegrity.
11	Sep	07	Add Aspension Tower.
17	Aug	07	Use new data for Perspective Prism (a bit plumper -- ends more circular).
15	Aug	07	Add Three-Stage X-Module Column.
13	Aug	07	Add Dodecahedron with X-Column Edges.
29	Jun	07	In the Index, change "Val Gómez" to "Gómez Jáuregui" in the two places it appears.
13	Jun	07	In the Index, change "v" to "ν" where it refers to frequency.
25	May	07	Add Perspective Prism.
15	Aug	06	In 4ν T-Octahedron Sphere: Final Design and 2ν Hexagon/Triangle T-Icosahedron: Final Design, make outer layer tendons red (1 .25 .25) instead of blue (.5 .5 1) so they are differentiated from the black ones better and to track changes in the book version of the figures.
09	May	06	Add "Center" Viewpoint to Concentric Five-fold Prisms.
17	Mar	06	Add another link to Figure 2.8 from my book in the burgeoning tensegrity tetrahedra section. Add a tag to the section of figures from my book.
15	Mar	06	Add Tensegrity Tetrahedron (Sadao-Price).
13	Mar	06	Add Tensegrity Tetrahedron (Snelson variation) and Tensegrity Tetrahedron (Snelson).
08	Feb	06	Add Skew Prism Arch.
07	Feb	06	Add Bouncy Mast (spiraling) and Bouncy Mast (alternating).
31	Jan	06	Add T-Cuboctahedron.
27	Jan	06	Add Skew Tensegrity.
13	Jan	06	Double "tendon" radius in Thirteen Great Circles and add an inside viewpoint.
30	Dec	05	Add Octahelix. Delete unused variables in Tetrahelix and Double Tetrahelix.
27	Dec	05	Add Thirteen Great Circles.
12	Dec	05	Revise Twelve-Stage Three Torus (alternative) to use red for the short struts.
08	Dec	05	Change Skew Eight-Prism (Regular Ends) so constrained struts have different color and use new data with more symmetry.
06	Dec	05	Add a couple skew 5-prisms. (Tetrahelix terminology was OK.)
21	Nov	05	Add Twelve-Stage Three Torus (alternative).
26	Sep	05	In Tetrahelix and Double Tetrahelix, generate data with scripts instead of using IndexedFaceSet externally generated using C++ vrmltetrahelix and vrmldblhelix utilities. Also, add cylinder+sphere skeleton outlining edges to these models. For the Double Tetrahelix, outer and inner spheres are now differentially colored. The outer and inner skeleton helixes are also differentially colored since, especially since the outer helix segments have slightly greater than unit length.
02	Sep	05	Change title of "Jitterbug" to The Three Bears as Jitterbugs. Take advantage of the modularity of the design to create three Jitterbugs executing simultaneously: the Momma, Poppa and Baby Jitterbug. In Tensegrity Tulip, use PROTO Steel { } instead of DEF/USE STEEL (latter didn't work) to distribute Steel spec across PROTOs.
01	Sep	05	Add Jitterbug.
26	Aug	05	Add 2v Zig-Zag Icosahedron Sphere (first variation) -- hubs at each end allowed to twist relative to each other, and 2v Zig-Zag Icosahedron Sphere (second variation) -- three hub vectors allowed to orient independently instead of being constrained to be mutually orthogonal or parallel.
25	Aug	05	Add 2v Zig-Zag Icosahedron Sphere. Rename "2v Sphere" and "2v Sphere (variation)" as 2v Double-Layer Octahedron Sphere and 2v Double-Layer Octahedron Sphere (variation).
17	Aug	05	Rename "Wheel Based on Val Gómez Module" as Wheel I (Val Gómez module). Add Wheel II (Val Gómez module).
15	Aug	05	Add Wheel Based on Val Gómez Module.
09	Aug	05	Adjust coloring for Triangularly Girdled Six-fold Prism (a.k.a. Homunculus). Use James Smith's torus for Tensegrity Tulip instead of humongous IndexedFaceSet. Adjust coloring of eyes to see if a more metallic look is possible. Remove PointLight from all Domes and add an inside Viewpoint to all of them. Use clearance corrected data for 6ν T-Octahedron Dome and 6v Dome. Use consistent modeling for 6ν T-Octahedron Dome and 6ν T-Octahedron Sphere: Vertex View and insert a faint red light inside both. Fix three Struts that were mis-classified as Tendons in the latter.
08	Aug	05	Add remaining book figures: Figure 4.1, 2ν Diamond T-Tetrahedron; Figure 5.6, 4ν T-Octahedron Sphere: Final Design; Figure 5.11, 2ν Hexagon/Triangle T-Icosahedron: Final Design; and Figure 6.5, 6ν T-Octahedron Sphere: Vertex View.
05	Aug	05	Add a book figure: Figure 2.1, Tensegrity Prism.
04	Aug	05	Add two book figures: Figure 4.8, 4ν Diamond T-Tetrahedron: Final Design, and Figure 4.11, 4ν Zig-Zag T-Tetrahedron: Final Design. Revise Figure 2.5, Tensegrity Icosahedron, to taper the strut a bit at the ends as in the book and connect its tendons similarly. Retain the old tendon configuration as variation on this figure. Remove the duplication from Figure 2.8, Tensegrity Tetrahedron.
03	Aug	05	Add two book figures: Figure 2.5, Tensegrity Icosahedron, and Figure 2.8, Tensegrity Tetrahedron. Adjust strut color for Snelson's Hub for X-Module Columns. Ask for notification in case of viewing problems.
02	Aug	05	Add Siamese Twin Three-fold Prisms. Adjust color of Orthogonal Tensegrity Prism and remove PointLight node.
29	Jul	05	Break Index into three sections. Add two book figures: Figure 6.11, 6ν T-Octahedron Dome: Side View, and Figure 7.2, Orthogonal Tensegrity Prism.
27	Jul	05	Add Snelson's Hub for X-Module Columns.
26	Jul	05	Add 4v Dome, 6v Dome and 8v Dome.
25	Jul	05	Add Two-fold Prism Girdled by Four-fold Prism, Concentric Five-fold Prisms, Concentric Five-fold Prisms (variation) and Triangularly Girdled Six-fold Prism.
24	Jul	05	Add Orthogonal Girdled Six-Fold Prism.
23	Jul	05	Add Four-Fold Four-Stage Obelisk.
22	Jul	05	Add Double Tetrahelix, Orthogonal Three-Prism (simple hubs), First Obelisk, Second Obelisk and First Bean Teepee.
21	Jul	05	Add Emmerich's Prism. Change VRML, geometry and link for Emmerich's Prism (variation). Change color of tendons for Six-Fold Equi-tendoned Prism. Redo VRML for Three Six-Fold Prisms Merged to better mimic POV-Ray output.
20	Jul	05	Add information about the tutorial and browser I use, a selection of toruses, Emmerich's Prism (variation), Half Cuboctahedron (Four-Fold Prism), Six-Fold Equi-tendoned Prism and Three Six-Fold Prisms Merged.
19	Jul	05	Add Four-Stage X-Module Column.
18	Jul	05	Add Tetrahedron, Helix, Skew Eight-Prism (Non-regular Ends) and Skew Eight-Prism (Regular Ends). Rename Tulip to Tensegrity Tulip. Create this file by extracting relevant entries from Java-Based Tensegrity Viewer: Revision History.
14	Jul	05	Per Spencer Hunter's suggestion, make platforms for X-Module Arch and 10v Dome VRML models semi-transparent. Add "From Below" Viewpoint node to 10v Dome VRML model -- my browser is so slow for this model, this seems the only practical way to change the point of view. Rename "Tensegrity Viewer" as Java-Based Tensegrity Viewer and move menu of VRML models from there to VRML Tensegrity Models. Create Dynamic Tensegrity Views index page and move link to this page from Java-Based Tensegrity Viewer to there. Add Tulip.
08	Jul	05	Initial VRML models.