Importing a GDSII Mask File

ViennaPS provides a convenient feature allowing users to import geometries directly from GDSII mask files. It’s important to note that ViennaPS focuses on handling simple geometry information extracted from GDSII files, without supporting additional data that might be stored within the GDSII format.

To parse a GDSII file using ViennaPS, follow these steps:

Create a ps::GDSGeometry Object: Initialize a ps::GDSGeometry object, specifying the desired grid spacing, boundary conditions, and additional padding (optional).
```
 auto mask = ps::SmartPointer<ps::GDSGeometry<NumericType, D>>::New();
 mask->setGridDelta(gridDelta);
 mask->setBoundaryConditions(boundaryConds);
 mask->setBoundaryPadding(xPad, yPad);
```
Replace gridDelta, boundaryConds, and xPad,yPad with your preferred values. The geometry is always parsed on a plane normal to the z direction. The values of xPad and yPad are always added to the largest and subtracted from the smallest extension of all geometries in the GDSII file.
Use ps::GDSReader to Parse Geometry: Utilize the ps::GDSReader to parse the GDSII file into the previously created ps::GDSGeometry object.
```
 ps::GDSReader<NumericType, D>(mask, "path/to/your/file.gds").apply();
```
Replace "path/to/your/file.gds" with the actual path to your GDSII file.

Convert Single Layers to Level Sets: Extract specific layers from the parsed GDSII geometry, convert them into level sets, and add them to your simulation domain. To access a particular layer, provide its GDSII layer number.

 // Create new domain
 auto domain = ps::SmartPointer<ps::Domain<NumericType, D>>::New(); 

 // Convert the layer to a level set and add it to the domain.
 auto layer = mask->layerToLevelSet(0 /*layer*/, 0 /*base z position*/, 0.5 /*height*/);
 domain->insertNextLevelSet(layer);

Replace layerNumber with the GDSII layer number you wish to access.

Layers can also be inverted to be used a mask.

 // Create new domain
 auto domain = ps::SmartPointer<ps::Domain<NumericType, D>>::New(); 

 // Convert the inverted layer to a level set and add it to the domain.
 auto layer = mask->layerToLevelSet(0 /*layer*/, 0 /*base z position*/, 
                                    0.5 /*height*/, true /*invert*/);
 domain->insertNextLevelSetAsMaterial(layer, ps::Material::Mask);

 // Create substrate underneath the mask
 ps::MakePlane<NumericType, D>(domain, 0. /*base z position*/, ps::Material::Si).apply();

GDS Reader

Importing a GDSII Mask File

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