public SCNGeometry ImportOBJ(string path)
{
string[] fileContents = File.ReadLines(path).ToArray();
GetLines(fileContents);
polygonCount = indexLines.Length;
int[] vertexIndexPrefix = SplitIndices(indexLines).Item1;
int[] vertexIndices = SplitIndices(indexLines).Item2;
int[] normalIndices = SplitIndices(indexLines).Item3;
SCNVector3[] vertexPoints = LinesToPoints(vertexLines);
SCNVector3[] normalPoints = LinesToPoints(normalLines);
SCNVector3[] vertices = OrderPoints(vertexPoints, vertexIndices);
SCNVector3[] normals = OrderPoints(normalPoints, normalIndices);
vertexIndices = ReorderIndices(vertexIndexPrefix, vertexIndices);
NSData vertexIndexData = IndexData(vertexIndices);
SCNGeometrySource vertexSource = SCNGeometrySource.FromVertices(vertices);
SCNGeometrySource normalSource = SCNGeometrySource.FromNormals(normals);
SCNGeometryElement vertexElement = SCNGeometryElement.FromData(vertexIndexData, SCNGeometryPrimitiveType.Polygon, polygonCount, sizeof(int));
return(SCNGeometry.Create(new[] { vertexSource, normalSource }, new[] { vertexElement }));
}
private SCNGeometry CreateTrailMesh(List <SCNVector3> positions, List <SCNVector4> colors)
{
SCNGeometry result = null;
if (positions.Count >= 4)
{
var array = new byte[positions.Count];
for (byte i = 0; i < positions.Count; i++)
{
array[i] = i;
}
var positionSource = SCNGeometrySource.FromVertices(positions.ToArray());
var colorSource = SCNGeometrySourceExtensions.Create(colors);
var element = SCNGeometryElement.FromData(NSData.FromArray(array), SCNGeometryPrimitiveType.TriangleStrip, positions.Count - 2, 2);
result = SCNGeometry.Create(new SCNGeometrySource[] { positionSource, colorSource }, new SCNGeometryElement[] { element });
var material = result.FirstMaterial;
if (material == null)
{
throw new Exception("created geometry without material");
}
material.DoubleSided = true;
material.LightingModelName = SCNLightingModel.Constant;
material.BlendMode = SCNBlendMode.Add;
material.WritesToDepthBuffer = false;
}
return(result);
}
public SCNGeometry MakeMeshGeometry(SCNVector3[] vertices, SCNVector3[] normals, List <int> faces)
{
var geometrySources = new[] { SCNGeometrySource.FromVertices(vertices), SCNGeometrySource.FromNormals(normals) };
var array = faces.SelectMany(v => BitConverter.GetBytes(v)).ToArray();
var indexData = NSData.FromArray(array);
var elementSource = SCNGeometryElement.FromData(indexData, SCNGeometryPrimitiveType.Triangles, (nint)(faces.Count / 3), (nint)sizeof(int));
var geometry = SCNGeometry.Create(geometrySources, new[] { elementSource });
geometry.WantsAdaptiveSubdivision = false;
return(geometry);
}
public static SCNGeometry ToSCNGeometry(this Solid csg)
{
if (csg.Polygons.Count == 0)
{
return(SCNGeometry.Create());
}
else
{
var verts =
csg.
Polygons.
SelectMany(x => x.Vertices).
Select(ToSCNVector3).
ToArray();
var norms =
csg.
Polygons.
SelectMany(x =>
{
var n = x.Plane.Normal.ToSCNVector3();
return(x.Vertices.Select(_ => n));
}).
ToArray();
var vertsSource = SCNGeometrySource.FromVertices(verts);
var normsSource = SCNGeometrySource.FromNormals(norms);
var sources = new[] { vertsSource, normsSource };
var triStream = new System.IO.MemoryStream();
var triWriter = new System.IO.BinaryWriter(triStream);
var triCount = 0;
var vi = 0;
foreach (var p in csg.Polygons)
{
for (var i = 2; i < p.Vertices.Count; i++)
{
triWriter.Write(vi);
triWriter.Write(vi + i - 1);
triWriter.Write(vi + i);
}
triCount += p.Vertices.Count - 2;
vi += p.Vertices.Count;
}
triWriter.Flush();
var triData = NSData.FromArray(triStream.ToArray());
var elem = SCNGeometryElement.FromData(triData, SCNGeometryPrimitiveType.Triangles, triCount, 4);
var elements = new[] { elem };
var g = SCNGeometry.Create(sources, elements);
g.FirstMaterial.Diffuse.ContentColor = NSColor.LightGray;
return(g);
}
}
static internal SCNGeometrySource [] CreateGeometrySources(nfloat width, nfloat height)
{
return(new [] {
SCNGeometrySource.FromVertices(new [] {
new SCNVector3(0, 0, 0),
new SCNVector3(0, height, 0),
new SCNVector3(width, height, 0),
new SCNVector3(width, 0, 0)
}),
SCNGeometrySource.FromNormals(new [] {
new SCNVector3(0, 0, 1),
new SCNVector3(0, 0, 1),
new SCNVector3(0, 0, 1),
new SCNVector3(0, 0, 1)
}),
SCNGeometrySource.FromTextureCoordinates(new [] {
new CGPoint(0, 0),
new CGPoint(0, 1),
new CGPoint(1, 1),
new CGPoint(1, 0)
})
});
}
