The documentation and the example scenes shipped with this asset show how to set up a VTK scene within your Unity project.

The non-exhaustive list below highlights the features provided by this asset:

I/O:

• OBJ, PLY, STL, GLTF file readers
• MHA, MHD, DICOM, NRRD, NIFTI file reader
• VTK, VTP, VTI, VTU, VTS, VTR file readers and parallel file readers
• CGNS, FLUENT, FLUENT CFF file readers
• STEP, IGES CAD file readers
• LIDAR data in LAS format

A complete description of the supported file formats is available here.

Processing:

• Clip filter
• Contour filter
• Streamlines
• Probing, Resampling
• Marching cubes, marching squares, flying edges, surface nets
• Mesh smoothing
• Mesh decimation
• Delaunay, Voronoy
• Octree, KdTree
• Edges extraction
• Point cloud reconstruction
• Normals, tangents and texture coordinates computation
• Selection extraction

Imaging:

• Color transfer functions
• Window Level rendering
• Maximum Intensity Projection (MIP) rendering
• MPR and Oblique rendering
• Image mask and stencil
• Image mathematics
• Blend images, Stack images
• Surface to image and image to surface conversion
• Image threshold
• Gaussian smoothing
• Gradient, Laplacian computation

Interacting:

• Point and cells picking
• Rubber band selection
• Line, spline, contour widgets
• Distance and bi-dimensional ruler widget
• ROI box widget
• Plane widget
• Point handle widget with arbitrary geometry
• Interactive text widget

Rendering:

• Order-independent transparency
• Depth Peeling - Dual Depth Peeling
• Line Integral Convolution
• Iso value rendering
• Physically Based Rendering
• SSAO for meshes
• SSAO for volumes
• Light scattering model for volume rendering

Limitations

- OS support:

The VTK plugin has been implemented and tested for Windows only. Support for Linux, MacOS and Android might come in future versions.

- Unity Graphics API:

VTK relies on the OpenGL rendering backend, thus Unity graphics API must be set to OpenGLCore.

- Virtual and Augmented Reality:

Although VTK and ActiViz natively support rendering in VR and AR headsets such as the Hololens 2, the Unity support for OpenXR does not work with the OpenGLCore rendering backend. For this reason, the plugin only supports rendering in VR headsets using the Unity legacy VR support that is based on OpenVR and available in Unity 2019.