12.0.520

• Removed WPF version of sample custom controls and unified the namespace as devDept.CustomControls
• Fixed crash on import of linetypes with reserved name in ReadAutodesk class
• Added LayerListView, LinetypesListView, MaterialListView, BlockListView, TextStylesListView, TableTabControl and FemUserControl to sample custom controls.
• Fixed OutOfMemory exception in WriteWebGL class
• Added support for CustomSynchronizationContext to WinForms/C# code samples (detailed discussion here) 
• Fixed export of individual curves in STEP file format
• Fixed toolbar button drawing when antialiasing is active and OS scaling level is 100%
• Added FemMesh clipping to FemDemo sample
• Improved Mesh section using Octree
• Fixed camera settings in WritePDF class
• Fixed formatting of sheets scale attribute
• Fixed selection rectangle for slices smaller than 512x512 in VolumeRendering code sample
• Fixed multitouch Pan/Zoom behavior on higher screen DPI
• Fixed triangles print bug in HiddenLineView class
• Fixed triangles scaling bug in HiddenLinesViewOnClipboard class
• Added Grid.ActualMin and ActualMax properties
• Fixed patient position in VolumeRendering class
• Fixed line pattern scale of hidden lines in Drawings environment
• Added IgnoreCase to name comparison of WriteIGES and WriteSTEP classes
• Fixed realistic shadow flickering with complex scene graphs bug
• Fixed view scale edit in Drawings environment
• Added export of sheets with custom paper size to WriteAutodesk class
• Added option to save geometry or tessellation in WritePDF class
• Added parallel execution to MarchingCubes and MarchingSquares classes
• Updated OpenDesign libraries to version 20.5
• Added ReadDWF class
• Improved collision detection speed introducing parallelism, a new triangle-triangle intersection algorithm and some transformation optimizations.
• Fixed export of Standard text style in WriteAutodesk class
• Fixed print of Text, Pictures and Region with empty drawing in HiddenLinesView class
• Added UtilityEx.GetLinesTangentToCircleFromPoint() method to compute tangent lines to a circle from an external point
• Added materials support to ReadAutodesk, WriteAutodesk and WritePDF classes
• Complete re-design of PaperSpace sample
• Fixed crash during dock/undock operations for a WPF based app called from a VB6 project
• Fixed TextStyleKeyedCollection.ChangeEntitiesRegenMode() method not supporting Table case
• Fixed Turbo support for Joint and Bar entities
• Fixed cutting of vector and raster views with a window
• Fixed issue with custom legend values in WPF 
• Fixed HiddenLinesView.CutTriangles() method with rectangle parameter
• Rolled back Text.Simplify and MultilineText.Simplify default value
• Fixed import of the position of sheet entities in ReadAutodesk class
• Fixed issue when Legend.Lighting was set equal to True via XAML
• Improved object snap speed for BlockReference in DraftingDemo code sample
• Removed Matrix class from control (duplicated of Geometry.Matrix).
• Extended ReadAutodesk.Simplify to all use cases
• Added overload method EnvironmentBase.GetMousePosition() to take in account the DPI scaling  duringdrag and drop
• Fixed Brep export by using parametric surface data for cylindrical and Nurbs surfaces in WriteAutodesk class
• Added support for IfcSurfaceCurveSweptAreaSolid, IfcCenterLineProfileDef and IfcDerivedProfileDef representations.