/*internal*/
public static IEnumerable <Mesh> GetPreviewMeshes
(
this IEnumerable <DB.GeometryObject> geometries,
MeshingParameters meshingParameters
)
{
foreach (var geometry in geometries)
{
if (geometry.Visibility != DB.Visibility.Visible)
{
continue;
}
switch (geometry)
{
case DB.GeometryInstance instance:
{
var xform = instance.Transform.ToTransform();
foreach (var g in instance.SymbolGeometry.GetPreviewMeshes(meshingParameters))
{
g?.Transform(xform);
yield return(g);
}
break;
}
case DB.Mesh mesh:
{
if (mesh.NumTriangles <= 0)
{
continue;
}
var f = Geometry.Raw.RawDecoder.ToRhino(mesh);
UnitConverter.Scale(f, UnitConverter.ToRhinoUnits);
yield return(f);
break;
}
case DB.Face face:
{
var faceMesh = face.Triangulate(meshingParameters.LevelOfDetail());
var f = Geometry.Raw.RawDecoder.ToRhino(faceMesh);
UnitConverter.Scale(f, UnitConverter.ToRhinoUnits);
yield return(f);
break;
}
case DB.Solid solid:
{
if (solid.Faces.IsEmpty)
{
continue;
}
var solidFaces = solid.Faces.OfType <DB.Face>();
bool useMultipleMaterials = solidFaces.HasMultipleMaterials();
var facesMeshes = useMultipleMaterials ? null : new List <Mesh>(solid.Faces.Size);
foreach (var face in solidFaces)
{
var faceMesh = face.Triangulate(meshingParameters.LevelOfDetail());
var f = Geometry.Raw.RawDecoder.ToRhino(faceMesh);
UnitConverter.Scale(f, UnitConverter.ToRhinoUnits);
if (facesMeshes is null)
{
yield return(f);
}
else if (f is object)
{
facesMeshes.Add(f);
}
}
if (facesMeshes is object)
{
if (facesMeshes.Count > 0)
{
var mesh = new Mesh();
mesh.Append(facesMeshes);
yield return(mesh);
}
else
{
yield return(null);
}
}
break;
}
}
}
}
/// <summary>
/// Extracts a sequence of <see cref="Mesh"/> from a sequence of <see cref="DB.GeometryObject"/>.
/// </summary>
/// <remarks>
/// Empty <see cref="DB.Mesh"/> and empty <see cref="DB.Solid"/> will be skipped,
/// so output <see cref="IEnumerable{T}"/> may be shorter than the input.
/// Output is warranted to be free of nulls, an empty <see cref="Mesh"/> is returned in case of error.
/// </remarks>
/// <param name="geometries"></param>
/// <param name="meshingParameters"></param>
/// <returns>An <see cref="IEnumerable{Mesh}"/></returns>
/// <seealso cref="GetPreviewMaterials(IEnumerable{DB.GeometryObject}, DB.Document, DB.Material)"/>
internal static IEnumerable <Mesh> GetPreviewMeshes
(
this IEnumerable <DB.GeometryObject> geometries,
DB.Document doc,
MeshingParameters meshingParameters
)
{
foreach (var geometry in geometries)
{
if (geometry.Visibility != DB.Visibility.Visible)
{
continue;
}
switch (geometry)
{
case DB.GeometryInstance instance:
{
var xform = instance.Transform.ToTransform();
foreach (var g in instance.SymbolGeometry.GetPreviewMeshes(doc, meshingParameters))
{
g.Transform(xform);
yield return(g);
}
break;
}
case DB.Mesh mesh:
{
if (mesh.NumTriangles <= 0)
{
continue;
}
if (SkipGeometryObject(geometry, doc))
{
continue;
}
var f = Geometry.Raw.RawDecoder.ToRhino(mesh);
UnitConverter.Scale(f, UnitConverter.ToRhinoUnits);
yield return(f ?? new Rhino.Geometry.Mesh());
break;
}
case DB.Face face:
{
if (SkipGeometryObject(geometry, doc))
{
continue;
}
var faceMesh = face.Triangulate(meshingParameters.LevelOfDetail());
var f = Geometry.Raw.RawDecoder.ToRhino(faceMesh);
UnitConverter.Scale(f, UnitConverter.ToRhinoUnits);
yield return(f ?? new Rhino.Geometry.Mesh());
break;
}
case DB.Solid solid:
{
if (solid.Faces.IsEmpty)
{
continue;
}
if (SkipGeometryObject(geometry, doc))
{
continue;
}
var solidFaces = solid.Faces.OfType <DB.Face>();
foreach (var face in solidFaces)
{
var faceMesh = face.Triangulate(meshingParameters.LevelOfDetail());
var f = Geometry.Raw.RawDecoder.ToRhino(faceMesh);
UnitConverter.Scale(f, UnitConverter.ToRhinoUnits);
yield return(f ?? new Rhino.Geometry.Mesh());
}
break;
}
}
}
}
