void generate_mesh(DenseGrid3f supportGrid, DenseGridTrilinearImplicit distanceField)
{
DenseGridTrilinearImplicit volume = new DenseGridTrilinearImplicit(
supportGrid, GridOrigin, CellSize);
BoundedImplicitFunction3d inputF = volume;
if (SubtractMesh)
{
BoundedImplicitFunction3d sub = distanceField;
if (SubtractMeshOffset > 0)
{
sub = new ImplicitOffset3d()
{
A = distanceField, Offset = SubtractMeshOffset
}
}
;
ImplicitDifference3d subtract = new ImplicitDifference3d()
{
A = volume, B = sub
};
inputF = subtract;
}
ImplicitHalfSpace3d cutPlane = new ImplicitHalfSpace3d()
{
Origin = Vector3d.Zero, Normal = Vector3d.AxisY
};
ImplicitDifference3d cut = new ImplicitDifference3d()
{
A = inputF, B = cutPlane
};
MarchingCubes mc = new MarchingCubes()
{
Implicit = cut, Bounds = grid_bounds, CubeSize = CellSize
};
mc.Bounds.Min.y = -2 * mc.CubeSize;
mc.Bounds.Min.x -= 2 * mc.CubeSize; mc.Bounds.Min.z -= 2 * mc.CubeSize;
mc.Bounds.Max.x += 2 * mc.CubeSize; mc.Bounds.Max.z += 2 * mc.CubeSize;
mc.Generate();
SupportMesh = mc.Mesh;
}
}
public virtual void Generate()
{
AxisAlignedBox3d graphBox = Graph.CachedBounds;
graphBox.Expand(2 * PostRadius);
double cellSize = (SamplerCellSizeHint == 0) ? (PostRadius / 5) : SamplerCellSizeHint;
ImplicitFieldSampler3d sampler = new ImplicitFieldSampler3d(graphBox, cellSize);
ActualCellSize = cellSize;
// sample segments into graph
ImplicitLine3d line = new ImplicitLine3d()
{
Radius = PostRadius
};
foreach (int eid in Graph.EdgeIndices())
{
Index2i ev = Graph.GetEdgeV(eid);
Vector3d v0 = Graph.GetVertex(ev.a);
Vector3d v1 = Graph.GetVertex(ev.b);
double r = PostRadius;
int upper_vid = (v0.y > v1.y) ? ev.a : ev.b;
if (TipVertices.Contains(upper_vid))
{
r = TipRadius;
}
line.Segment = new Segment3d(v0, v1);
line.Radius = r;
sampler.Sample(line, line.Radius / 2);
}
foreach (int vid in GroundVertices)
{
Vector3d v = Graph.GetVertex(vid);
sampler.Sample(new ImplicitSphere3d()
{
Origin = v - (PostRadius / 2) * Vector3d.AxisY, Radius = GroundRadius
});
}
ImplicitHalfSpace3d cutPlane = new ImplicitHalfSpace3d()
{
Origin = Vector3d.Zero, Normal = Vector3d.AxisY
};
ImplicitDifference3d cut = new ImplicitDifference3d()
{
A = sampler.ToImplicit(), B = cutPlane
};
MarchingCubes mc = new MarchingCubes()
{
Implicit = cut, Bounds = graphBox, CubeSize = PostRadius / 3
};
mc.Bounds.Min.y = -2 * mc.CubeSize;
mc.Bounds.Min.x -= 2 * mc.CubeSize; mc.Bounds.Min.z -= 2 * mc.CubeSize;
mc.Bounds.Max.x += 2 * mc.CubeSize; mc.Bounds.Max.z += 2 * mc.CubeSize;
mc.CancelF = this.Cancelled;
mc.Generate();
ResultMesh = mc.Mesh;
}