Installing Rhino 5.0 WIP will not affect Rhino 4.0 - you can have both on your computer at the same time.

What's New, WIP 2009-11-04 (4-Nov-2009)
(Printer Friendly)
Enhanced Features:

• History: You can now edit the properties of a history locked object, like change the layer or color or use analysis commands that do not affect the geometry and therefore do not break the history.
• SketchUp Export now tries to make outer and inner boudaries out of planar mesh regions.  This makes the output more user friendly in SketchUp.  You can use the Push/Pull tool on whole walls now instead of single triangles.

• Crv2View crash fixed.
• Intersect: A failure bug has been fixed.
• Layout: The ViewportPrint color option did not work properly. This is fixed.
• Loft: Pressing Enter to accept the defaults now works.
• MatchSrf crash fixed.
• MaterialEditor: Browsing for a material did not work when VRay was the selected renderer. This is fixed.
• RhinoRender: Transparent background left an extra pixel around objects. This is fixed.
• Surface/Surface Intersection: Now returns surface isoparametric curves when possible.
• Surface/Surface Intersection: Many failure bugs have been fixed, especially where surfaces intersect at tangent points.

• Texture mapping: In a texture’s local mapping section, there is now a Display checkbox that causes the selected texture to appear on all related materials in the viewport as the “Color” texture making it visible, no matter what the texture represents.
  

• Alt key did not move focus to menus. This is fixed.
• CurveBoolean: Input arcs did not properly output arcs. This is fixed.
• DimAngle: Angular dimensions modified by sliding a grip created bad objects. This is fixed.
• Display: When control points were far from their parent surfaces, Rhino's internal clipping planes did not clip the view properly. This is fixed.
• Layout: Printing view and scale did not work properly. This is fixed.
• Make2D crash fixed.
• MaterialEditor: The Material Editor dialog box suffered from flickering. This is fixed.

• CPlane: The Object option now allows control points to be selected as the object by selecting the point either before or after selecting the Object option.
• Dot: Screen size and font are now properties of dots and can be set and edited in the Properties dialog box.
• ReplaceBlock: New dialog control with right-click context menu to set display mode and view.

• Circle: FitPoints - Fitting to points has been improved.
• CrvSeam: Prompt change.
• ExtractRenderMesh/ExtractAnalysisMesh: Incorrectly selected individual objects in a group rather than the whole group. This is fixed.
• Import: In the Files of Type list, the All category at the bottom of the list was displayed twice. The second copy had the formats repeated several times in succession. This is fixed.
  
• Make2D crash fixed.
• Offset: Cleaning up corner cases should work better now.
• Open:SKP crash fixed.
• ReduceMesh crash fixed.
• Save: An option to create backup files has been added. It is ON by default.
• SetPt: A failure bug in shaded views has been fixed.
• UnrollSrf: A failure bug has been fixed.

• MaterialEditor: The Material Editor is undergoing a lot of rework at the moment. Comment on recent changes to help establish the way this will work.

• ExtractRenderMesh/ExtractAnalysisMesh: If the original objects were grouped, the result was incorrectly included in the group. This is fixed.
• MaterialEditor: Mouse wheel scrolling did not work properly in the Material Editor. This is fixed.
• Options > Selection menu: If only the "Show object type details" box is checked, object types will appear in the Selection Menu dialog box if there are no details.

• Select:

  • Curves with linetypes set to Dotted were difficult to select with a single pick. This is fixed.
  • Selecting overlapping surfaces has been improved.

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McNeel • North America • Europe • Latin America • Asia