Geodesica-SFX is an OpenGL geodesic modeller that implements cross-target quad-edge lattices. The program can construct a variety of advanced spaceframes, such as the Eden Project Dome and the Union Tank Car Dome. The program exports IGES (B-Rep), DXF and OBJ.

Development Status

BASIC PRINCIPLES

   Spherical Geometry Primer

• Geodesic Lines
• Lunes
• Spherical Triangles
• Area of a Spherical Triangle
• Equilateral Spherical Triangles
• Spherical Trigonometry
• Spherical Coordinates

   Great Circle Systems

• Great Circles of the Tetrahedron
• Great Circles of the Octahedron
• Great Circles of the Icosahedron

   Geodesic Subdivision

• Subdivision Classes
• Breakdown Methods
• Symmetry Maps

   Symmetria Mirabilis

• Polyhedral Kaleidoscopes

INTERFACE

   The following shows the main UI components; their use is discussed under ‘OPERATION’.

• Main Window
• Toolbar
• Menus
• Attributes Window
• Log Window
• Navigator Window
• Navigator Window Version 1.0
• Plan Window
• Symmetry Map Window
• Envelopes Window
• Range Adjust / Truncate Window
• Make Trifans Window
• Lights Window
• Viewports Window
• Fog Window
• Struts and Hubs Window

OPERATION

   Target Mechanism

• Target Mechanism Overview
   Demonstrations

• Union Tank Car Dome Demonstration
• Eden Project Dome Demonstration
• Saint Louis Refrigerator Car Dome Demonstration
• Exotic Spaceframes Demonstration

   Isolate Mechanism

• Isolate Mechanism Overview
   Quad-Edge Manifiold

• Isolate Edge
• Isolate Face
• Isolate Vertex
• Connectivity Logging Example

   Mesh Superimpositions

• Isolate Strut
• Isolate Panel
• Isolate Hub

   Range Adjust / Truncate

• Range Adjust / Truncate Overview
• Dual Truncations

   Envelopes

• Setting The Envelope
• Theta Distribution Curves

   Struts

• Struts Overview
   Face Struts

• Face Strut Tetragon Simple Mitre
• Face Strut Tetragon Spline Mitre
• Face Strut Tetragon Butt Mitre
• Face Strut Tetragon
   Edge Struts

• Edge Strut Cylinder (solid)
• Edge Strut Cylinder (hollow)
• Edge Strut Rectangle (solid)
• Edge Strut Rectangle (hollow)
• Edge Strut Square (solid)
• Edge Strut Square (hollow)
• Edge Strut Diamond Square (solid)
• Edge Strut Diamond Square (hollow)
• Edge Strut Ellipse (solid)
• Edge Strut Triangle (solid)
• Edge Strut Polygon (solid)

   Hubs

• Hubs Overview
   Hub Generation

• The Hub Normal
• The Hub Plane
• Hub Normal - Weighted Facet Average
• Hub Normal - Micro Trifan Weighted Average
• Hub Axis Shift
• Hub Context Menu
• Orientating Hubs on The Truncation Plane

   Strut and Hub Intersections

• Strut Dimension Options
• Strut and Hub Intersections Part 1 ORG and DEST Hub INTR
• Strut and Hub Intersections Part 2 Intersection Rules
• Strut and Hub Intersections Part 3 Star & Ring flange Hubs
• Strut and Hub Intersections Part 4 Handling Errors
• Omitting Struts on the Truncation Plane
• Compound Mitres
• Spindle Struts Option

   Modelling Operations

• Kill Vertex
• Collapse Edge
• Kill Face Edge
• Make Face Edge
• Divide Edge
• Truncate Vertex
• Split & Bevel
• Stellate
• Extrude
• Cupola
• Make Trifans
• Smooth

   Preferences

• Colours Tab
• Textures Tab
• Precision Tab
• Units Tab
• OpenGL Tab
• Labels Tab
• Hubs Tab

Quad-Edge Data Structure

• Overview

Export

• DXF R12 Export
• OBJ Export
• IGES Export