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VRML Tensegrity Models: Revision History

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30Oct09 Add Tensegrity Tetrahedron (Pars).
30Sep09 New link for Floppy's VRML97 tutorial.
23Feb09 Decrease radius of struts in The Empty Chair (Marcelo Pars) from 10 mm to 9 mm per info from Marcelo Pars.
17Feb09 Add The Empty Chair (Marcelo Pars).
21Nov08 Add 5-Fold Fan Prism.
30Jun08 Add Aspension Arch.
03Jun08 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.
22May08 Add 8-Stage Zig-Zag Arch.
19May08 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.
10Mar08 Add Aspension Skylon.
26Dec07 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.
07Dec07 Revise data files for Wishbone Tensegrity and Diamond-Shaped Tensegrity.
21Nov07 Add Split-Level Prism, Wishbone Tensegrity and Diamond-Shaped Tensegrity.
11Sep07 Add Aspension Tower.
17Aug07 Use new data for Perspective Prism (a bit plumper -- ends more circular).
15Aug07 Add Three-Stage X-Module Column.
13Aug07 Add Dodecahedron with X-Column Edges.
29Jun07 In the Index, change "Val Gómez" to "Gómez Jáuregui" in the two places it appears.
13Jun07 In the Index, change "v" to "ν" where it refers to frequency.
25May07 Add Perspective Prism.
15Aug06 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.
09May06 Add "Center" Viewpoint to Concentric Five-fold Prisms.
17Mar06 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.
15Mar06 Add Tensegrity Tetrahedron (Sadao-Price).
13Mar06 Add Tensegrity Tetrahedron (Snelson variation) and Tensegrity Tetrahedron (Snelson).
08Feb06 Add Skew Prism Arch.
07Feb06 Add Bouncy Mast (spiraling) and Bouncy Mast (alternating).
31Jan06 Add T-Cuboctahedron.
27Jan06 Add Skew Tensegrity.
13Jan06 Double "tendon" radius in Thirteen Great Circles and add an inside viewpoint.
30Dec05 Add Octahelix. Delete unused variables in Tetrahelix and Double Tetrahelix.
27Dec05 Add Thirteen Great Circles.
12Dec05 Revise Twelve-Stage Three Torus (alternative) to use red for the short struts.
08Dec05 Change Skew Eight-Prism (Regular Ends) so constrained struts have different color and use new data with more symmetry.
06Dec05 Add a couple skew 5-prisms. (Tetrahelix terminology was OK.)
21Nov05 Add Twelve-Stage Three Torus (alternative).
26Sep05 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.
02Sep05 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.
01Sep05 Add Jitterbug.
26Aug05 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.
25Aug05 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).
17Aug05 Rename "Wheel Based on Val Gómez Module" as Wheel I (Val Gómez module). Add Wheel II (Val Gómez module).
15Aug05 Add Wheel Based on Val Gómez Module.
09Aug05 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.
08Aug05 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.
05Aug05 Add a book figure: Figure 2.1, Tensegrity Prism.
04Aug05 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.
03Aug05 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.
02Aug05 Add Siamese Twin Three-fold Prisms. Adjust color of Orthogonal Tensegrity Prism and remove PointLight node.
29Jul05 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.
27Jul05 Add Snelson's Hub for X-Module Columns.
26Jul05 Add 4v Dome, 6v Dome and 8v Dome.
25Jul05 Add Two-fold Prism Girdled by Four-fold Prism, Concentric Five-fold Prisms, Concentric Five-fold Prisms (variation) and Triangularly Girdled Six-fold Prism.
24Jul05 Add Orthogonal Girdled Six-Fold Prism.
23Jul05 Add Four-Fold Four-Stage Obelisk.
22Jul05 Add Double Tetrahelix, Orthogonal Three-Prism (simple hubs), First Obelisk, Second Obelisk and First Bean Teepee.
21Jul05 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.
20Jul05 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.
19Jul05 Add Four-Stage X-Module Column.
18Jul05 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.
14Jul05 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.
08Jul05 Initial VRML models.

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