private static DMesh3 BooleanUnion(DMesh3 mesh1, DMesh3 mesh2)
{
BoundedImplicitFunction3d meshA = meshToImplicitF(mesh1, 64, 0.2f);
BoundedImplicitFunction3d meshB = meshToImplicitF(mesh2, 64, 0.2f);
//take the difference of the bolus mesh minus the tools
ImplicitUnion3d mesh = new ImplicitUnion3d()
{
A = meshA, B = meshB
};
//calculate the boolean mesh
MarchingCubes c = new MarchingCubes();
c.Implicit = mesh;
c.RootMode = MarchingCubes.RootfindingModes.LerpSteps;
c.RootModeSteps = 5;
c.Bounds = mesh.Bounds();
c.CubeSize = c.Bounds.MaxDim / 128;
c.Bounds.Expand(3 * c.CubeSize);
c.Generate();
MeshNormals.QuickCompute(c.Mesh);
int triangleCount = c.Mesh.TriangleCount / 2;
Reducer r = new Reducer(c.Mesh);
r.ReduceToTriangleCount(triangleCount);
return(c.Mesh);
}
public static ImplicitUnion3d ImplicitUnion(BoundedImplicitFunction3d meshA, BoundedImplicitFunction3d meshB)
{
var union = new ImplicitUnion3d()
{
A = meshA, B = meshB
};
return(union);
}
public static void test_marching_cubes_implicits()
{
DMesh3 mesh = TestUtil.LoadTestInputMesh("bunny_solid.obj");
MeshTransforms.Translate(mesh, -mesh.CachedBounds.Center);
double meshCellsize = mesh.CachedBounds.MaxDim / 32;
MeshSignedDistanceGrid levelSet = new MeshSignedDistanceGrid(mesh, meshCellsize);
levelSet.ExactBandWidth = 3;
levelSet.UseParallel = true;
levelSet.ComputeMode = MeshSignedDistanceGrid.ComputeModes.NarrowBandOnly;
levelSet.Compute();
var meshIso = new DenseGridTrilinearImplicit(levelSet.Grid, levelSet.GridOrigin, levelSet.CellSize);
ImplicitOffset3d offsetMeshIso = new ImplicitOffset3d()
{
A = meshIso, Offset = 2.0
};
double r = 15.0;
ImplicitSphere3d sphere1 = new ImplicitSphere3d()
{
Origin = Vector3d.Zero,
Radius = r
};
ImplicitSphere3d sphere2 = new ImplicitSphere3d()
{
Origin = r * Vector3d.AxisX,
Radius = r
};
ImplicitAxisAlignedBox3d aabox1 = new ImplicitAxisAlignedBox3d()
{
AABox = new AxisAlignedBox3d(r * 0.5 * Vector3d.One, r, r * 0.75, r * 0.5)
};
ImplicitBox3d box1 = new ImplicitBox3d()
{
Box = new Box3d(new Frame3f(r * 0.5 * Vector3d.One, Vector3d.One.Normalized),
new Vector3d(r, r * 0.75, r * 0.5))
};
ImplicitLine3d line1 = new ImplicitLine3d()
{
Segment = new Segment3d(Vector3d.Zero, r * Vector3d.One),
Radius = 3.0
};
ImplicitHalfSpace3d half1 = new ImplicitHalfSpace3d()
{
Origin = Vector3d.Zero, Normal = Vector3d.One.Normalized
};
ImplicitUnion3d union = new ImplicitUnion3d()
{
A = sphere1, B = line1
};
ImplicitDifference3d difference = new ImplicitDifference3d()
{
A = meshIso, B = aabox1
};
ImplicitIntersection3d intersect = new ImplicitIntersection3d()
{
A = meshIso, B = half1
};
ImplicitNaryUnion3d nunion = new ImplicitNaryUnion3d()
{
Children = new List <BoundedImplicitFunction3d>()
{
offsetMeshIso, sphere1, sphere2
}
};
ImplicitNaryDifference3d ndifference = new ImplicitNaryDifference3d()
{
A = offsetMeshIso,
BSet = new List <BoundedImplicitFunction3d>()
{
sphere1, sphere2
}
};
ImplicitBlend3d blend = new ImplicitBlend3d()
{
A = sphere1, B = sphere2
};
BoundedImplicitFunction3d root = intersect;
AxisAlignedBox3d bounds = root.Bounds();
int numcells = 64;
MarchingCubes c = new MarchingCubes();
c.RootMode = MarchingCubes.RootfindingModes.LerpSteps;
c.RootModeSteps = 5;
c.Implicit = root;
c.Bounds = bounds;
c.CubeSize = bounds.MaxDim / numcells;
c.Bounds.Expand(3 * c.CubeSize);
c.Generate();
MeshNormals.QuickCompute(c.Mesh);
TestUtil.WriteTestOutputMesh(c.Mesh, "marching_cubes_implicit.obj");
}
