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What's New, SR6 (9-Jul-2009)
Enhanced Features:

• Block: A warning about blocks with no geometry as been added.
• Open: A confirmation message now appears on the command line.
• Save:STL - Interface change: The options and prompts for a scripted export of file formats that use the STL mesh setting have been changed to more closely resemble the settings of the Mesh command.

• BlockManager: Hidden blocks (with * prefix in the name) did not display correctly. This is fixed.
• BooleanUnion crash fixed.
• BoxEdit crash fixed.
• Circle crash fixed.
• Circle crash fixed.
• Close Rhino crash has been fixed.
• CopyViewportToDetail faieds after the first time the command is run. This is fixed.
• Dim: The hyphen between feet and inches sometimes did not display. This is fixed.
• DimAngle crash fixed.
• DocumentProperties, Render: The Lock viewport aspect ration was incorrectly not maintained after closing the dialog box. This is fixed.
• EdgeSrf crash fixed.
• EditPtOn crash fixed.
• ExtrudeSrfTapered: Failure bug fixed.
• Flow command crash fixed.
• Insert: A problem with creating layers after the insertion was canceled has been fixed.
• Installer: A file required for ZPR export was not being installed. This is fixed.
• Installers: Level I and Level II Training Guides now have installers.
• InterpCrvOnSrf command crash fixed.
• InterpCrvOnSrf crash fixed.
• Intersect crash fixed.
• Linetypes: The Document Properties Linetype scale incorrectly allowed 0 as a value. This disabled linetypes. This is fixed.
• Loft command crash fixed.
• Loft crash fixed.
• Loft crash fixed.
• Loft crash fixed.
• Loft crash fixed.
• Loft: Several bugs that caused an incorrect surface have been fixed.
• MacroEditor: A problem with focus to the command line has been fixed.
• Offset crash fixed.
• OffsetSrf crash fixed.
• OffsetSrf crash fixed.
• Open:DWG/DXF: A problem opening DXF files has been fixed.
• Open:DWG: Splines did not read properly. This is fixed.
• Open:IGES crash fixed.
• Open:OBJ: Files imported from topmod3D had some gaps. This is fixed.
• Open:OBJ: OBJ data was not read correctly by Service Release 5b. This is fixed.
• Open:SKP: An import error has been fixed.
• Open:SolidWorks crash fixed.
• Open:STEP crash fixed.
• Open crash fixed.
• Options, Appearance: The Full path in titlebar option did not work properly. This is fixed.
• Options, Appearance, Advanced Settings: The Export button was incorrectly available even when no scheme is selected for export. This is fixed.
• PanelingTools: Several crashes fixed.
• Panelling Tools: Crash fixed.
• Patch crash fixed.
• PointDeviation: The Apply button did not work correctly. This is fixed.
• Polygon crash fixed.
• Polygon crash fixed.
• Polyline crash fixed.
• Print crash fixed.
• Properties: Text crash fixed.
• Rectangle crash fixed.
• Reparameterize crash fixed.
• RhinoScript: The RhinoScript page of Options incorrectly allowed the same script file to be added more than once to the list of files to load at startup.
  
• Save:3DS: A problem with importing and exporting has been fixed.
• Save:DWG/DXF: Support for exporting ACIS solids has been added. Create or edit a named export scheme, and change the export option for Rhino surfaces to AutoCAD Solids.
• SaveAs crash fixed.
• Scale1D did not properly update CurvatureAnalysis colors. This is fixed.
• ScaleEdge crash fixed.
• SelBlockInstanceNamed crash fixed.
• ShortCurves plugin crash fixed.
• Starting Rhino on Vista Improved: previous releases of Rhino 4.0 sometimes would only start when run as Administrator. SR6 should start without administrator permissions.
• Toolbar: Graphic images were garbled when toolbar was imported. This is fixed.
• TriangulateNonPlanarQuads: A problem with the selection calculation has been fixed.

• RhinoScript: Now supports Layer state management. 

• AlignMeshVertices: Pressing Esc incorrectly completed the command instead of exiting. This is fixed.
• Circle: Crash with SmartTrack fixed.
• Extend: Crash fixed.
• Import:STEP: Crash when file contains extra periods has been fixed.
• Installer: Crash on startup fixed.
• Offset: Crash fixed.
• Open:DWG/DXF: A problem importing regions has been fixed.
• Open crash fixed.
• PlayAnimation: Crash fixed.
• Project crash fixed.
• RemoveEdge: Crash fixed.
• SaveAs crash fixed.
• Split crash fixed.
• Trim crash fixed.

• Cap: The Cap command now provides more useful information when it fails to cap a hole.
• RecordAnimation: RenderFull method can now be canceled with the Esc key.
• RoundHole: The Radius option now gets the keyboard input by default.

• 4View crash fixed. 
• Align crash fixed. 
• ArrayPolar: Input angle sometimes overshot. This is fixed.
• BackgroundBitmap crash fixed.
• Block: When a block with surfaces is mirrored and exploded, the surfaces had their normals incorrectly flipped. This is fixed.
• Circle crash fixed. 
• Context menu: The Repeat menu item did not work. This is fixed.
• Crashes fixed:
  
  • Close without saving
  • CurveThroughPt
  • Import
  • FilletEdge
  • New
  • Open
  • Open:OBJ
  • Rebuild
  • Reparameterize
  • SplitMeshWithCurve
  • Trim 
  • Sweep 1
  • Zoom
    
• Curve crash fixed.
• DocumentProperties: Importing default dimension styles did not work properly. This is fixed.
• DWG import crash fixed.
• DWG Import now correctly reads files with text and annotations containing special characters such as %%d (degree symbol), %%p (plus/minus symbol), etc.
• ExtractPt crash fixed.
• ExtrudeSrfTapered: Surfaces made by the PlanarSrf command may not work properly when they are used as the input surface for this command. This is fixed.
• Join crash fixed.
• MacroEditor command now has a scroll bar to make it easier to edit macros that are longer than the window can display.
• MoveCrv: History did not workproperly with the MoveCrv command. This is fixed.
• MoveUVN - Interface change: The way it used to work was you had to turn all the surface control points off and back on and then select them to get MoveUVN to recalculate the vector directions. Now, you only have to deselect the control poinsts and reselect them to get a new vector direction calculation.
• Offset: Inputting the wrong geometry type (polysurface face) locked Rhino. This is fixed.
• Open:DWG crash fixed.
• Open:OBJ: Texture controls were incorrectly disabled. This is fixed.
• Open:PDF: CS4 (Adobe Illustrator files (.ai) written by the latest CS 4 version of AI) files did not open properly. This is fixed.
• Open:SolidWorks: Several problems reading SolidWorks files have been fixed.
• Open crash fixed.
• Open crash fixed.
• Options crash fixed.
• Pipe command incorrectly created pipes twice the diameter expected when using Diameter mode and picking the diameter point with object snaps enabled.
• PointCloud: When points were deleted from the pointcloud, the pointcloud's bounding box did not update. This is fixed.
• Polyline crash fixed.
• Print: A problem printing to Adobe PDF files has been fixed.
• Project: Projecting a line to a planar surface incorrectly created a cubic line instead of a line.  It now creates either a line or a degree 2 single span NURBS curve.
• Rectangle crash fixed.
  
• Render crash closing render window fixed.
• Render crash on cancel fixed.
• RenderPreview crash fixed.
• Reparameterize crash fixed.
• Revolve crash revolving a closed curve fixed.
  
• Revolve: A failure bug when revolving closed polylines has been fixed.
• RhinoScript: Cancelling a script could leave objects highlighted even though they were no longer selected. This is fixed.
• Save:DWG/DXF: Multi-line text exported with wrong vertical position. This is fixed.
• Save:DWG: Exporting a file with layouts did not work properly with "2004 Natural" export. This is fixed.
• Save:DWG: Leader lines did not export properly to DWG. This is fixed.
• Save:STEP: A problem exporting planar surfaces has been fixed.
• Save:STEP: A failure bug exporting to UG and SolidWorks has been fixed.
• SetPt no longer transforms text objects that have their control points turned off.
• SketchUP Import: fixed a crash opening SketchUP Version 7 files.
• SmartTrack: Did not always snap to all ortho directions from the smart point. This is fixed.
• Smash crash fixed.
• Solidworks import crash fixed.
• Sweep2: Canceling an AddSlash operation caused the rails to become unslectable for another AddSlash operation. This is fixed.
• Toolbars crash fixed.
• UnrollSrf: A failure bug was fixed.
• UnrollSrf: The border of an unrolled surface could not be joined. This is fixed.
• Volume crash fixed.
• VRML import crash fixed. 
• WebBrowser: The command makes an attempt to open the desired page in a new tab or window.
• Zoom crash fixed.

• Crash when closing the Options dialog box has been fixed.
• Divide: The DivideByLength option did not work properly on closed curves. This is fixed.
• Export SAT: the correct unit system is now saved in SAT files. This makes it possible to read Rhino's SAT files into other applications and have them maintain the correct size.
• Installer: deploying Rhino 4.0 SR4 with Ative Directory or SMS resulted in "Error 1606. Could not access network location empty." This is fixed in the SR4b installer.
• Open:DWG/DXF: Display of very large polyline on import did not work correctly. This is fixed.
• Open:zpr: A problem opening zpr files has been fixed.
• Recently used commands: Commands repeated from the recently used list, then repeated again with Enter, started the command previous to the current one. This is fixed.
• ShadedViewport: In a shaded viewport, objects behind another object that is set to Wireframe mode are not pickable.
  
• SmartTrack now pays attention to Project setting in the Osnap toolbar. That should help in this case when Project setting is enabled.
• Zoom Window/Dynamic: Were not completely canceled by ESC. This is fixed.

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