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   Summary:     Geodesica-SFX-MesaGL-64 release notes
   Author:      Nicholas Shea
   Copyright:   Nicholas Shea 2000-2020
  
   Tested on Windows 7 64 bit and Windows 10 Pro 1903 64 bit.
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Geodesica-SFX-MesaGL-win64-0-9-9-9q Codename: Steiner  [Uploaded on 25 Jul 2021]

• Fixed code so that bend angle psi 'ψ' is calculated correctly for spaceframe
  members whose hub normal angle is less than 90°.
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Geodesica-SFX-MesaGL-win64-0-9-9-9p Codename: Steiner  [Uploaded on 24 Jul 2021]

• Analyse Tab
  Updated 'ANGLES AT A VERTEX' and 'LENGTH OF AN EDGE' so that they also log the
  Org and Dest bend angles for bolting to the hub.
  
  Updated web documention for these tools:
  Analyse Vertex Angles
  Analyse Edge Length
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Geodesica-SFX-MesaGL-win64-0-9-9-9n Codename: Steiner  [Uploaded on 19 Jul 2021]

• Modify Tab
  Updated 'Truncate Vertex' tool with new behaviours.
  
  The old ALT key modifier for the planar option has been removed and a new
  pop-up menu is used instead. Additionally, the option to move 'D' units down
  the hub normal to create the intersection plane is now provided.
  
  The pop-up choice has the following options:
  
      Hub Normal Planar
      Edge Planar
      Edge Non-Planar
      
  Updated web documention for Truncate Vertex to expain these options.
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Geodesica-SFX-MesaGL-win64-0-9-9-9m Codename: Steiner  [Uploaded on 18 Jul 2021]

• Analyse Tab
  Updated 'Angles at a Vertex' so that the log also lists the angles between the
  edge and the hub plane. This gives the bend angles for the ends of the struts
  so that they may be bolted together (as in a simple bolt-hub mechanism).
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Geodesica-SFX-MesaGL-win64-0-9-9-9k Codename: Steiner  [Uploaded on 25 Apr 2021]

• Code maintenance release.
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Geodesica-SFX-MesaGL-win64-0-9-9-9j Codename: Steiner  [Uploaded on 17 Nov 2020]

• Control key modifier option for Extrude Face
  When down, each vertex is extruded along its own envelope normal; previously,
  the control key option used a single envelope normal at the face centroid for
  all vertices. The new behaviour means that adjacent facets now meet at their
  extrusion points, (id est, +ve extrusions "flare" outward).
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Geodesica-SFX-MesaGL-win64-0-9-9-9i Codename: Steiner  [Uploaded on 14 Nov 2020]

• Alt key modifier option for Extrude Face
  When down, the radials are deleted from the extruded face.
  
• Fixed code so that facets do not have to be visible when using the coplanar
  option for Truncate Vertices
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Geodesica-SFX-MesaGL-win64-0-9-9-9h Codename: Steiner  [Uploaded on 12 Nov 2020]

• Alt key coplanar option for Truncate Vertices.
  FACETS MUST BE VISIBLE WHEN YOU PICK THE VERTEX FOR THE COPLANAR OPTION.
  
• Bug fix for Truncate Vertices with the Shift key option;
  array bounds might have been exceeded in certain (rare) cases.
  
• Fixed Mesa linkage error
  The previous version failed to use the Mesa opengl32.dll library supplied with
  the distribution and used the system opengl32.dll instead; this meant that the
  MesaGL version was not using Mesa!
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Geodesica-SFX-MesaGL-win64-0-9-9-9g Codename: Steiner  [Uploaded on 12 Aug 2020]

• Implemented Spindle strut option for Cylindrical and Polygonal strut profiles:
  http://www.neolithicsphere.com/strut_spindle_option.htm
  
• Fixed OBJ export material file name bug. Name was assigned to temporary which
  could result in a garbage name for the mtllib in the OBJ file.
  This bug was introduced in previous version.

• Fixed OBJ export Polygonal struts deformation when projecting to hub
  intersection plane. This bug introduced in previous version.
  
  The Unit Radius Scale Factor now defaults to 10 units. The default units are
  Meters and Feet. Please adjust strut and hub dimensions accordingly as the
  prefs have not been updated to account for the new scale factor.
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Geodesica-SFX-MesaGL-win64-0-9-9-9e Codename: Steiner  [Uploaded on 15 Jun 2020]

This release corrects an IGES export issue with 0-9-9-9d.

• Fixed IGES cylinder and ellipse strut export bugs (2).
• Kill Vertex Tool: added extra check when deleting a vertex will create a lone
  island face.
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Geodesica-SFX-MesaGL-win64-0-9-9-9 Codename: Steiner   [Uploaded on 10 May 2020]

• Fixed Trunacte Vertices with SHIFT key option where the progress window failed
  to close after the operation had completed.
• Upgraded to FLTK 1-3-5.
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Geodesica-SFX-MesaGL-win64-0-9-9-8e Codename: Steiner  [Uploaded on 17 Apr 2020]
                                     

• Fixed IGES Cells export bug for the bounded planes option.
  Details: cells failed to import correctly in AutoCAD online viewer and Fusion.
  FreeCAD, IGS Viewer, CAD Assistant and CAD Exchanger were unaffected by this
  bug. NOTE: The bug did not affect cells exported as a manifold B-Rep.
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Geodesica-SFX-MesaGL-win64-0-9-9-8d
Codename: Steiner                                      [Uploaded on 16 Apr 2020]

• Fixed IGES export units conversion bug.
• Fixed UI Select Tab bug where the selection state was not updated to its
  previous state after returning from the Isolate Tabs.
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Geodesica-SFX-MesaGL-win64-0-9-9-8c
Codename: Steiner                                      [Uploaded on 15 Apr 2020]

• Fixed Hubs "TCO" (Trifan center only) option. When this item is checked on
  the Hubs panel of the Attributes window, hubs are only generated for the
  Trifan centers. However, some previous versions ignored this option when
  exporting the hubs.
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