/// <summary>
/// Store a triangle, adding new vertices for it
/// to our vertex lookup dictionary if needed and
/// accumulating its volume and centroid contribution.
/// </summary>
void StoreTriangle(
IList <XYZ> vertices,
PolymeshFacet triangle,
XYZ normal)
{
// Retrieve the three triangle vertices
Transform currentTransform = CurrentTransform;
XYZ[] p = new XYZ[] {
currentTransform.OfPoint(vertices[triangle.V1]),
currentTransform.OfPoint(vertices[triangle.V2]),
currentTransform.OfPoint(vertices[triangle.V3])
};
// Ensure the three are ordered counter-clockwise
//XYZ v = p[1] - p[0];
//XYZ w = p[2] - p[0];
//Debug.Assert( Util.IsRightHanded( v, w, normal ),
// "expected counter-clockwise vertex order" );
// Centroid and volume calculation
_centroid_volume.AddTriangle(p);
// Store vertex, facet and normals
for (int i = 0; i < 3; ++i)
{
PointInt q = new PointInt(p[i]);
_triangles.Add(_vertices.AddVertex(q));
_normalIndices.Add(_normals.AddNormal(
currentTransform.OfVector(normal)));
}
}
public void OnPolymesh(PolymeshTopology node)
{
XMesh m = new XMesh();
m.Name = "Mesh" + XData.Objects.Last().Meshs.Count;
Transform t = Transforms.Peek();
for (int i = 0; i < node.NumberOfFacets; i++)
{
PolymeshFacet f = node.GetFacet(i);
m.Triangles.Add(f.V1);
m.Triangles.Add(f.V2);
m.Triangles.Add(f.V3);
}
for (int i = 0; i < node.NumberOfPoints; i++)
{
XYZ p = t.OfPoint(node.GetPoint(i));
m.Vertexs.Add(new XVec3(p.X, p.Y, p.Z));
}
for (int i = 0; i < node.NumberOfNormals; i++)
{
XYZ n = t.OfVector(node.GetNormal(i));
m.Normals.Add(new XVec3(n.X, n.Y, n.Z));
}
for (int i = 0; i < node.NumberOfUVs; i++)
{
UV u = node.GetUV(i);
m.UVs.Add(new XVec2(u.U, u.V));
}
m.MaterialID = matLink[matid];
XData.Objects.Last().Meshs.Add(m);
string log = null;
if (EnableLog)
{
log = "Mesh\n,Name:" + m.Name + "\nVertex:" + m.Vertexs.Count;
}
meshLog.Add(log);
}
/// <summary>
/// 当输出3d面的镶嵌多边形时，将调用此方法。
/// </summary>
/// <param name="polymesh">表示多边形网格拓扑的节点</param>
void IExportContext.OnPolymesh(PolymeshTopology polymesh)
{
ModelGeometry exportedGeometry = new ModelGeometry
{
Points = polymesh.GetPoints(),
Normals = polymesh.GetNormals(),
Uvs = polymesh.GetUVs(),
Transform = transformationStack.Peek(),
DistributionOfNormals = polymesh.DistributionOfNormals,
Indices = new List <int>(polymesh.GetFacets().Count * 3)
};
if (exportedGeometry.Transform.IsConformal && exportedGeometry.Transform.HasReflection)
{
using (IEnumerator <PolymeshFacet> enumerator = polymesh.GetFacets().GetEnumerator())
{
while (enumerator.MoveNext())
{
PolymeshFacet current = enumerator.Current;
exportedGeometry.Indices.Add(current.V1);
exportedGeometry.Indices.Add(current.V3);
exportedGeometry.Indices.Add(current.V2);
}
goto Fine;
}
}
foreach (PolymeshFacet current2 in polymesh.GetFacets())
{
exportedGeometry.Indices.Add(current2.V1);
exportedGeometry.Indices.Add(current2.V2);
exportedGeometry.Indices.Add(current2.V3);
}
Fine:
if (isElementDoubleSided)
{
exportedGeometry.MakeDoubleSided();
}
documentAndMaterialIdToGeometries[currentDocumentAndMaterialId].Add(exportedGeometry);
}
