Computer-aided design - Importing IGES and STEP files

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STEP and IGES files can be directly translated into Medusa's NURBSShape if they only contain NURBS objects. Helper functions, which do that, are provided in the Medusa-Extras repository. For their usage, OpenCASCADE library must be installed on the system.

Some example CAD models are also provided in the repository, code that discretizes a tiger model using the strategy described in Determining the interior of the domain by oversampling the boundary is shown below

NURBSShape<Vec3d, Vec2d> shape = translate_STEP("examples/tiger.step");
double h = 2;

// Oversample the domain.
DomainDiscretization<Vec3d> oversampled_domain = shape.discretizeBoundaryWithStep(h / 5);

for (int i = 0; i < oversampled_domain.size(); i++) {
    oversampled_domain.normal(i) *= -1;
}

// Construct the contains function.
KDTree<Vec3d> contains_tree;
oversampled_domain.makeDiscreteContainsStructure(contains_tree);
auto contains_function = [&] (const Vec3d p) {
    return oversampled_domain.discreteContains(p, contains_tree);
};

// Fill the boundary normally.
DomainDiscretization<Vec3d> domain = shape.discretizeBoundaryWithStep(h);

// Fill the interior with the contains function.
KDTreeMutable<Vec3d> tree;
GeneralFill<Vec3d> gf;
gf(domain, h, tree, contains_function);

Using the provided plot script, we get