|
public static CalculateNormals ( IList |
||
| positions | IList |
/// The positions. /// |
| triangleIndices | IList |
/// The triangle indices. /// |
| return | System.Windows.Media.Media3D.Vector3DCollection | |
/// <summary>
/// Calculates the texture for the specified model.
/// </summary>
/// <param name="model">
/// The model.
/// </param>
/// <param name="mesh">
/// The mesh.
/// </param>
public override void Calculate(TerrainModel model, MeshGeometry3D mesh)
{
var normals = MeshGeometryHelper.CalculateNormals(mesh);
var texcoords = new PointCollection();
var up = new Vector3D(0, 0, 1);
for (int i = 0; i < normals.Count; i++)
{
double slope = Math.Acos(Vector3D.DotProduct(normals[i], up)) * 180 / Math.PI;
double u = slope / 40;
if (u > 1)
{
u = 1;
}
if (u < 0)
{
u = 0;
}
texcoords.Add(new Point(u, u));
}
this.TextureCoordinates = texcoords;
this.Material = MaterialHelper.CreateMaterial(this.Brush);
}
/// <summary>
/// Calculates the texture of the specified model.
/// </summary>
/// <param name="model">
/// The model.
/// </param>
/// <param name="mesh">
/// The mesh.
/// </param>
public override void Calculate(TerrainModel model, MeshGeometry3D mesh)
{
var normals = MeshGeometryHelper.CalculateNormals(mesh);
var texcoords = new PointCollection();
for (int i = 0; i < normals.Count; i++)
{
double slopedir = Math.Atan2(normals[i].Y, normals[i].X) * 180 / Math.PI;
if (slopedir < 0)
{
slopedir += 360;
}
double u = slopedir / 360;
texcoords.Add(new Point(u, u));
}
this.TextureCoordinates = texcoords;
this.Material = MaterialHelper.CreateMaterial(this.Brush);
}
/// <summary>
/// Writes a <see cref="GeometryModel3D"/> to a <see cref="BinaryWriter"/> in STL binary format.
/// </summary>
/// <param name="writer">The <see cref="BinaryWriter"/> to write to.</param>
/// <param name="model">The model to write.</param>
/// <param name="t">All vertices are transformed with this transform before written</param>
protected override void ExportModel(BinaryWriter writer, GeometryModel3D model, Transform3D t)
{
var mesh = (MeshGeometry3D)model.Geometry;
var normals = mesh.Normals;
if (normals == null || normals.Count != mesh.Positions.Count)
{
normals = MeshGeometryHelper.CalculateNormals(mesh);
}
// TODO: Also handle non-uniform scale
var matrix = t.Clone().Value;
matrix.OffsetX = 0;
matrix.OffsetY = 0;
matrix.OffsetZ = 0;
var normalTransform = new MatrixTransform3D(matrix);
for (int i = 0; i < mesh.TriangleIndices.Count; i += 3)
{
int i0 = mesh.TriangleIndices[i + 0];
int i1 = mesh.TriangleIndices[i + 1];
int i2 = mesh.TriangleIndices[i + 2];
// Normal
var faceNormal = normalTransform.Transform(normals[i0] + normals[i1] + normals[i2]);
faceNormal.Normalize();
WriteVector(writer, faceNormal);
// Vertices
WriteVertex(writer, t.Transform(mesh.Positions[i0]));
WriteVertex(writer, t.Transform(mesh.Positions[i1]));
WriteVertex(writer, t.Transform(mesh.Positions[i2]));
// Attributes
const ushort attribute = 0;
writer.Write(attribute);
}
}
/// <summary>
/// Writes a <see cref="GeometryModel3D"/> to a <see cref="BinaryWriter"/> in STL binary format.
/// </summary>
/// <param name="writer">The <see cref="BinaryWriter"/> to write to.</param>
/// <param name="model">The model to write.</param>
/// <param name="t">All vertices are transformed with this transform before written</param>
protected override void ExportModel(BinaryWriter writer, GeometryModel3D model, Transform3D t)
{
var mesh = (MeshGeometry3D)model.Geometry;
var normals = mesh.Normals;
if (normals == null || normals.Count != mesh.Positions.Count)
{
normals = MeshGeometryHelper.CalculateNormals(mesh);
}
// TODO: Also handle non-uniform scale
var matrix = t.Clone().Value;
matrix.OffsetX = 0;
matrix.OffsetY = 0;
matrix.OffsetZ = 0;
var normalTransform = new MatrixTransform3D(matrix);
var material = model.Material;
var dm = material as DiffuseMaterial;
var mg = material as MaterialGroup;
if (mg != null)
{
foreach (var m in mg.Children)
{
if (m is DiffuseMaterial)
{
dm = m as DiffuseMaterial;
}
}
}
ushort attribute = 0;
if (dm != null)
{
var scb = dm.Brush as SolidColorBrush;
if (scb != null)
{
byte r = scb.Color.R;
byte g = scb.Color.G;
byte b = scb.Color.B;
attribute = (ushort)((1 << 15) | ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3));
}
}
for (int i = 0; i < mesh.TriangleIndices.Count; i += 3)
{
int i0 = mesh.TriangleIndices[i + 0];
int i1 = mesh.TriangleIndices[i + 1];
int i2 = mesh.TriangleIndices[i + 2];
// Normal
var faceNormal = normalTransform.Transform(normals[i0] + normals[i1] + normals[i2]);
faceNormal.Normalize();
WriteVector(writer, faceNormal);
// Vertices
WriteVertex(writer, t.Transform(mesh.Positions[i0]));
WriteVertex(writer, t.Transform(mesh.Positions[i1]));
WriteVertex(writer, t.Transform(mesh.Positions[i2]));
// Attributes
writer.Write(attribute);
}
}
