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# sight::io::vtk
Library for writing and reading data (image, mesh, ...) to and from many VTK formats like `.vtp`, `.ply` or `.vti`. Seed [VTK](https://vtk.org/) for more information.
## Classes
Most of the classes inherit from io::reader::generic_object_reader or io::writer::generic_object_writer. They all share almost the same API.
### Helper
- **Mesh**: converts Mesh to and from VTK data like `vtkPolyData` or `vtkUnstructuredGrid`
- **TransferFunction**: converts TransferFunction to and from VTK `vtkLookupTable`
- **vtk**: converts image to/from `vtkImageData`, Matrix4 to/from `vtkMatrix4x4`
### Reader / Writer
- **BitmapImageReader**: reads bitmap image from any supported format from `vtkImageReader2Collection`.
- **image[Read|Writ]er**: reads/writes `image` to/from legacy `.vtk`.
- **Mesh[Read|Writ]er**: reads/writes `image` to/from legacy `.vtk`.
- **MetaImage[Read|Writ]er**: reads/writes `image` to/from `.mhd`
- **ModelSeriesObjWriter**: writes `ModelSeries` to many `.obj`
- **ObjMesh[Read|Writ]er**: reads/writes `Mesh` to/from `.obj`.
- **PlyMesh[Read|Writ]er**: reads/writes `Mesh` to/from `.ply`.
- **series_setReader**: reads `series_set` from a collection of files. It basically uses other readers depending of the file extension.
- **StlMesh[Read|Writ]er**: reads/writes `Mesh` to/from `.stl`.
- **VtiImage[Read|Writ]er**: reads/writes `image` to/from `.vti`.
- **VtpMesh[Read|Writ]er**: reads/writes `Mesh` to/from `.vtp`.
## How to use it
All `readers` and `writers` which implements `io::reader::generic_object_reader` will share the same usage.
Here is a sample for `.vti` image:
### Writing
```c++
auto writer = sight::io::vtk::VtiImageWriter::New();
writer->set_object(image);
writer->setFile(file);
writer->write();
```
### Reading
```c++
auto reader = sight::io::vtk::VtiImageReader::New();
writer->set_object(image);
writer->setFile(file);
writer->read();
```
### CMake
```cmake
target_link_library(my_target <PUBLIC|PRIVATE> io_vtk)
```
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