Classes derived from CompositeCurve and Region (like RectangularCompositeCurve and RectangularRegion) are now deprecated. Static methods like CompositeCurve.CreateRectangle or Region.CreateRectangle were added for this purpose.
When a boolean operation fails, it returns null.
BC-84 Disappearing objects after Entity.Regen() In version 10 entity didn't disappear but was displayed with an outdated shape. In version 11 object is skipped during drawing until a manual call to Entity.Compile() or ViewportLayout.Entities.Regen().
BC-85 Missing EntityList.Parallel property Parallel regeneration was removed in version 11 in favor of regeneration on a separate thread with progress bar feedback.
A (limited) support for old graphics cards with DirectX11 9_3 feature level is available with the following additional limitations: no planar reflections, no two sided lighting, four lights instead of eight, no point or spot lights, no width for lines and points.