protected static IndexBuffer ToWireframeBuffer(Rhino.Geometry.Mesh mesh, out int linesCount)
{
linesCount = (mesh.Faces.Count * 3) + mesh.Faces.QuadCount;
if (linesCount > 0)
{
var ib = new IndexBuffer(linesCount * IndexLine.GetSizeInShortInts());
ib.Map(linesCount * IndexLine.GetSizeInShortInts());
using (var istream = ib.GetIndexStreamLine())
{
foreach (var face in mesh.Faces)
{
istream.AddLine(new IndexLine(face.A, face.B));
istream.AddLine(new IndexLine(face.B, face.C));
istream.AddLine(new IndexLine(face.C, face.D));
if (face.IsQuad)
{
istream.AddLine(new IndexLine(face.D, face.A));
}
}
}
ib.Unmap();
return(ib);
}
return(null);
}
// A helper function, analogous to ProcessFaces.
private void ProcessEdges(RenderingPassBufferStorage bufferStorage)
{
List <IList <XYZ> > edges = bufferStorage.EdgeXYZs;
if (edges.Count == 0)
{
return;
}
// Edges are encoded as line segment primitives whose vertices contain only position information.
bufferStorage.FormatBits = VertexFormatBits.Position;
int edgeVertexBufferSizeInFloats = VertexPosition.GetSizeInFloats() * bufferStorage.VertexBufferCount;
List <int> numVerticesInEdgesBefore = new List <int>();
numVerticesInEdgesBefore.Add(0);
bufferStorage.VertexBuffer = new VertexBuffer(edgeVertexBufferSizeInFloats);
bufferStorage.VertexBuffer.Map(edgeVertexBufferSizeInFloats);
{
VertexStreamPosition vertexStream = bufferStorage.VertexBuffer.GetVertexStreamPosition();
foreach (IList <XYZ> xyzs in edges)
{
foreach (XYZ vertex in xyzs)
{
vertexStream.AddVertex(new VertexPosition(vertex + m_offset));
}
numVerticesInEdgesBefore.Add(numVerticesInEdgesBefore.Last() + xyzs.Count);
}
}
bufferStorage.VertexBuffer.Unmap();
int edgeNumber = 0;
bufferStorage.IndexBufferCount = bufferStorage.PrimitiveCount * IndexLine.GetSizeInShortInts();
int indexBufferSizeInShortInts = 1 * bufferStorage.IndexBufferCount;
bufferStorage.IndexBuffer = new IndexBuffer(indexBufferSizeInShortInts);
bufferStorage.IndexBuffer.Map(indexBufferSizeInShortInts);
{
IndexStreamLine indexStream = bufferStorage.IndexBuffer.GetIndexStreamLine();
foreach (IList <XYZ> xyzs in edges)
{
int startIndex = numVerticesInEdgesBefore[edgeNumber];
for (int i = 1; i < xyzs.Count; i++)
{
// Add two indices that define a line segment.
indexStream.AddLine(new IndexLine((int)(startIndex + i - 1),
(int)(startIndex + i)));
}
edgeNumber++;
}
}
bufferStorage.IndexBuffer.Unmap();
bufferStorage.VertexFormat = new VertexFormat(bufferStorage.FormatBits);
bufferStorage.EffectInstance = new EffectInstance(bufferStorage.FormatBits);
}
public static int GetPrimitiveSize(PrimitiveType primitive)
{
switch (primitive)
{
case PrimitiveType.LineList: return(IndexLine.GetSizeInShortInts());
case PrimitiveType.PointList: return(IndexPoint.GetSizeInShortInts());
case PrimitiveType.TriangleList: return(IndexTriangle.GetSizeInShortInts());
default: break;
}
return(IndexTriangle.GetSizeInShortInts());
}
static IndexBuffer IndexLinesBuffer(int pointsCount)
{
Debug.Assert(pointsCount <= VertexThreshold);
if (indexLinesBuffer == null)
{
indexLinesBuffer = new IndexBuffer(VertexThreshold * IndexLine.GetSizeInShortInts());
indexLinesBuffer.Map(VertexThreshold * IndexLine.GetSizeInShortInts());
using (var istream = indexLinesBuffer.GetIndexStreamLine())
{
for (int vi = 0; vi < VertexThreshold - 1; ++vi)
{
istream.AddLine(new IndexLine(vi, vi + 1));
}
}
indexLinesBuffer.Unmap();
}
Debug.Assert(indexLinesBuffer.IsValid());
return(indexLinesBuffer);
}
protected static IndexBuffer ToEdgeBuffer
(
Rhino.Geometry.Mesh mesh,
Primitive.Part part,
out int linesCount
)
{
if (part.VertexCount != mesh.Vertices.Count)
{
if (part.VertexCount > 0)
{
linesCount = -part.VertexCount;
return(IndexPointsBuffer(part.VertexCount));
}
linesCount = 0;
}
else
{
var edgeIndices = new List <IndexPair>();
if (mesh.Ngons.Count > 0)
{
foreach (var ngon in mesh.Ngons)
{
var boundary = ngon.BoundaryVertexIndexList();
if ((boundary?.Length ?? 0) > 1)
{
for (int b = 0; b < boundary.Length - 1; ++b)
{
edgeIndices.Add(new IndexPair((int)boundary[b], (int)boundary[b + 1]));
}
edgeIndices.Add(new IndexPair((int)boundary[boundary.Length - 1], (int)boundary[0]));
}
}
}
else
{
var vertices = mesh.TopologyVertices;
var edges = mesh.TopologyEdges;
var edgeCount = edges.Count;
for (int e = 0; e < edgeCount; ++e)
{
if (edges.IsEdgeUnwelded(e) || edges.GetConnectedFaces(e).Length < 2)
{
var pair = edges.GetTopologyVertices(e);
pair.I = vertices.MeshVertexIndices(pair.I)[0];
pair.J = vertices.MeshVertexIndices(pair.J)[0];
edgeIndices.Add(pair);
}
}
}
linesCount = edgeIndices.Count;
if (linesCount > 0)
{
var ib = new IndexBuffer(linesCount * IndexLine.GetSizeInShortInts());
ib.Map(linesCount * IndexLine.GetSizeInShortInts());
using (var istream = ib.GetIndexStreamLine())
{
foreach (var edge in edgeIndices)
{
Debug.Assert(0 <= edge.I && edge.I < part.VertexCount);
Debug.Assert(0 <= edge.J && edge.J < part.VertexCount);
istream.AddLine(new IndexLine(edge.I, edge.J));
}
}
ib.Unmap();
return(ib);
}
}
return(null);
}