# Major Release 21.00

## Library compatibility information

Library name | Version | Windows | Linux | OS X | Notes
--- | --- | --- | --- | --- | ---
DGN Direct | 3.8.1 |  |  |  |
HOOPS Exchange | 2015 |  |  |  |
HOOPS Publish | 2015 |  |  |  |
.NET Framework | 4.0 |  |  |  | v4.5 required for wpf_image v4.5 required for WPF over Remote Desktop
Parasolid | 23.0 |  |  |  |
Qt | 4.6.3 |  |  |  |
RealDWG | 2015 |  |  |  | Visual Studio 2012 only
SketchUp | SDK v7 |  |  |  |

## New features and enhancements

- All 3D shader drivers now have support for rendering transparent backgrounds to an offscreen window target.
- The visual selection algorithm has been enhanced to take advantage of available hardware acceleration on shader based drivers, improving selection performance.
- There is a new quick moves heuristic, inplace, which is useful when using a transparent highlight style with quick move geometry.
- Capping geometry can now be extracted to another segment.
- You can now use selection culling to enable or disable selection of culled geometry.
- Performance of view-dependent vertex markers (splat-rendering using filled circles and filled squares) has been improved in the DirectX 11 driver. See section 2.8.2.1 of the Programming Guide for details about vertex markers.
- The performance of patterned line and edge drawing in the DX11 and OpenGL2 drivers has been improved by up to 15x. The reference manual entry for HC_Set_Line_Pattern contains further details.
- You may now set a soft memory limit, which triggers an event when Visualize allocates more memory than specified.
- Rendering performance when using static model has been improved for a wide variety of scene graph organizations.
- There is a new ‘strength’ parameter for eye-dome lighting, which helps to smooth out any graphical anomalies in the image.
- The double-precision rendering logic has been enhanced to take advantage OpenGL hardware acceleration when such acceleration is available. This will result in greatly improved rendering performance for double-precision primitives. More information is available in the OpenGL2 section of the Device Guide.

- File loading performance for IFC files loaded through the HOOPS Exchange interface has been significantly improved.

### Functional changes

- The HIO_DWG2 interface has been renamed to HIO_DWG. The legacy HIO_DWG interface that was deprecated and replaced by HIO_DWG2 in version 20.00 is no longer provided.
- Project changes

> - Windows: VS2012 and VS2013 are supported, and VS2010 has been dropped, consistent with our policy of supporting the two most recent Windows compilers. Please note the following implications:

>   - HIO_DWG:

>     RealDWG 2015 is supported. RealDWG 2013/2014 only support Visual Studio 2010 and thus no longer work with our projects.

>   - HIO_DWF:

>     This module is no longer supported because it is only available under Visual Studio 2010. Autodesk is no longer providing any ongoing support or mainentance for the DWF Toolkit.

> OS X: Support for Qt has been dropped.

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