/// <summary>
/// This is the method that actually does the work.
/// </summary>
/// <param name="DA">The DA object can be used to retrieve data from input parameters and
/// to store data in output parameters.</param>
protected override void SolveInstance(IGH_DataAccess DA)
{
// 1. Declare placeholder variables
List<Curve> struts = new List<Curve>();
double radius = 0;
// 2. Attempt to fetch data inputs
if (!DA.GetDataList(0, struts)) { return; }
if (!DA.GetData(1, ref radius)) { return; }
// 3. Validate data
if (struts == null || struts.Count == 0) { return; }
if (radius <= 0) { return; }
// 4. Set some variables
int sides = 6; // Number of sides on each strut
double tol = RhinoDoc.ActiveDoc.ModelAbsoluteTolerance;
// 5. Instantiate ExoMesh object
// This constructor cleans the curve network (removes duplicates), and formats it as an ExoMesh.
ExoMesh exoMesh = new ExoMesh(struts);
//====================================================================================
// PART A - Compute radii
// Set the start/end radii of each sleeve, based on user input.
//====================================================================================
// C0. Set radii
foreach (ExoSleeve sleeve in exoMesh.Sleeves)
{
sleeve.StartRadius = radius;
sleeve.EndRadius = radius;
}
//====================================================================================
// PART B - Compute plate offsets
// Each plate is offset from its parent node, to avoid mesh overlaps.
// We also ensure that the no plates are engulfed by the hulls, so we're looking for
// a convex plate layout. If any plate vertex gets engulfed, meshing will fail.
//====================================================================================
// B0. Loop over nodes
for (int i = 0; i < exoMesh.Hulls.Count; i++)
{
// If node has only 1 strut, skip it
if (exoMesh.Hulls[i].SleeveIndices.Count < 2)
{
continue;
}
// Compute the offsets required to avoid plate overlaps
bool success = exoMesh.ComputeOffsets(i, tol);
// To improve convex hull shape at 'sharp' nodes, we add an extra plate
exoMesh.FixSharpNodes(i, sides);
}
// IDEA : add a new loop here that adjusts radii to avoid overlapping struts
//====================================================================================
// PART C - Construct sleeve meshes and hull points
//
//====================================================================================
// E0. Loop over all sleeves
for (int i = 0; i < exoMesh.Sleeves.Count; i++)
{
Mesh sleeveMesh = exoMesh.MakeSleeve(i, sides);
// append the new sleeve mesh to the full lattice mesh
exoMesh.Mesh.Append(sleeveMesh);
}
//====================================================================================
// PART D - Construct hull meshes
// Generates convex hulls, then removes the faces that lie on the plates.
//====================================================================================
// D0. Loop over all hulls
for (int i = 0; i < exoMesh.Hulls.Count; i++)
{
ExoHull node = exoMesh.Hulls[i];
int plateCount = exoMesh.Hulls[i].PlateIndices.Count;
// If node has a single plate, create an endmesh
if (plateCount < 2)
{
Mesh endMesh = exoMesh.MakeEndFace(i, sides);
exoMesh.Mesh.Append(endMesh);
}
// If node has more than 1 plate, create a hullmesh
else
{
Mesh hullMesh = exoMesh.MakeConvexHull(i, sides, tol, true);
exoMesh.Mesh.Append(hullMesh);
}
}
// 6. Post-process the final mesh.
exoMesh.Mesh.Vertices.CombineIdentical(true, true);
exoMesh.Mesh.FaceNormals.ComputeFaceNormals();
exoMesh.Mesh.UnifyNormals();
exoMesh.Mesh.Normals.ComputeNormals();
// 7. Set output
DA.SetData(0, exoMesh.Mesh);
}
/// <summary>
/// This is the method that actually does the work.
/// </summary>
/// <param name="DA">The DA object can be used to retrieve data from input parameters and
/// to store data in output parameters.</param>
protected override void SolveInstance(IGH_DataAccess DA)
{
// 1. Declare placeholder variables
List<Curve> struts = new List<Curve>();
string gradientString = null;
double maxRadius = 0;
double minRadius = 0;
// 2. Attempt to fetch data inputs
if (!DA.GetDataList(0, struts)) { return; }
if (!DA.GetData(1, ref gradientString)) { return; }
if (!DA.GetData(2, ref maxRadius)) { return; }
if (!DA.GetData(3, ref minRadius)) { return; }
// 3. Validate data
if (struts == null || struts.Count == 0) { return; }
if (maxRadius <= 0 || minRadius <= 0) { return; }
// 4. Set some variables
int sides = 6; // Number of sides on each strut
double tol = RhinoDoc.ActiveDoc.ModelAbsoluteTolerance;
// 5. Instantiate ExoMesh object
// This constructor cleans the curve network (removes duplicates), and formats it as an ExoMesh.
ExoMesh exoMesh = new ExoMesh(struts);
//====================================================================================
// PART A - Compute radii
// Set the start/end radii of each sleeve, based on spatial gradient.
//====================================================================================
// A0. Prepare bounding box domain for normalized gradient string
BoundingBox fullBox = new BoundingBox();
foreach (ExoSleeve sleeve in exoMesh.Sleeves)
{
var strutBox = sleeve.Curve.GetBoundingBox(Plane.WorldXY);
fullBox.Union(strutBox);
}
double boxSizeX = fullBox.Max.X - fullBox.Min.X;
double boxSizeY = fullBox.Max.Y - fullBox.Min.Y;
double boxSizeZ = fullBox.Max.Z - fullBox.Min.Z;
gradientString = GH_ExpressionSyntaxWriter.RewriteForEvaluator(gradientString);
// A1. Set radii
foreach (ExoSleeve sleeve in exoMesh.Sleeves)
{
// Start node
ExoHull node = exoMesh.Hulls[sleeve.HullPair.I];
var parser = new Grasshopper.Kernel.Expressions.GH_ExpressionParser();
parser.AddVariable("x", (node.Point3d.X - fullBox.Min.X) / boxSizeX);
parser.AddVariable("y", (node.Point3d.Y - fullBox.Min.Y) / boxSizeY);
parser.AddVariable("z", (node.Point3d.Z - fullBox.Min.Z) / boxSizeZ);
sleeve.StartRadius = minRadius + (parser.Evaluate(gradientString)._Double) * (maxRadius - minRadius);
parser.ClearVariables();
// End node
node = exoMesh.Hulls[sleeve.HullPair.J];
parser.AddVariable("x", (node.Point3d.X - fullBox.Min.X) / boxSizeX);
parser.AddVariable("y", (node.Point3d.Y - fullBox.Min.Y) / boxSizeY);
parser.AddVariable("z", (node.Point3d.Z - fullBox.Min.Z) / boxSizeZ);
sleeve.EndRadius = minRadius + (parser.Evaluate(gradientString)._Double) * (maxRadius - minRadius);
parser.ClearVariables();
}
//====================================================================================
// PART B - Compute plate offsets
// Each plate is offset from its parent node, to avoid mesh overlaps.
// We also need to ensure that no plates are engulfed by the hulls, so we're
// looking for a convex plate layout. If any plate vertex gets engulfed, meshing will fail.
//====================================================================================
// B0. Loop over nodes
for (int i = 0; i < exoMesh.Hulls.Count; i++)
{
// If node has only 1 strut, skip it
if (exoMesh.Hulls[i].SleeveIndices.Count < 2)
{
continue;
}
// Compute the offsets required to avoid plate overlaps
bool success = exoMesh.ComputeOffsets(i, tol);
// To improve convex hull shape at 'sharp' nodes, we add an extra plate
exoMesh.FixSharpNodes(i, sides);
}
// IDEA : add a new loop here that adjusts radii to avoid overlapping struts
//====================================================================================
// PART C - Construct sleeve meshes and hull points
//
//====================================================================================
// C0. Loop over all sleeves
for (int i = 0; i < exoMesh.Sleeves.Count; i++)
{
Mesh sleeveMesh = exoMesh.MakeSleeve(i, sides);
// Append the new sleeve mesh to the full lattice mesh
exoMesh.Mesh.Append(sleeveMesh);
}
//====================================================================================
// PART D - Construct hull meshes
// Generates convex hulls, then removes the faces that lie on the plates.
//====================================================================================
// D0. Loop over all hulls
for (int i = 0; i < exoMesh.Hulls.Count; i++)
{
ExoHull node = exoMesh.Hulls[i];
int plateCount = exoMesh.Hulls[i].PlateIndices.Count;
// If node has a single plate, create an endmesh
if (plateCount < 2)
{
Mesh endMesh = exoMesh.MakeEndFace(i, sides);
exoMesh.Mesh.Append(endMesh);
}
// If node has more than 1 plate, create a hullmesh
else
{
Mesh hullMesh = exoMesh.MakeConvexHull(i, sides, tol, true);
exoMesh.Mesh.Append(hullMesh);
}
}
// 6. Post-process the final mesh.
exoMesh.Mesh.Vertices.CombineIdentical(true, true);
exoMesh.Mesh.FaceNormals.ComputeFaceNormals();
exoMesh.Mesh.UnifyNormals();
exoMesh.Mesh.Normals.ComputeNormals();
// 7. Set output
DA.SetData(0, exoMesh.Mesh);
}