/// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="field"></param>
/// <param name="getColor"></param>
/// <returns></returns>
public static Mesh ToPolySoup <T>(this GridField2d <T> field, Func <T, Color> getColor)
where T : struct
{
Mesh mesh = new Mesh();
var verts = mesh.Vertices;
var colors = mesh.VertexColors;
var faces = mesh.Faces;
var values = field.Values;
(var dx, var dy) = (field.Scale * 0.5);
int index = 0;
// add vertices
for (int i = 0; i < field.CountY; i++)
{
for (int j = 0; j < field.CountX; j++)
{
Vec2d p = field.CoordinateAt(j, i);
verts.Add(p.X - dx, p.Y - dy, 0.0);
verts.Add(p.X + dx, p.Y - dy, 0.0);
verts.Add(p.X - dx, p.Y + dy, 0.0);
verts.Add(p.X + dx, p.Y + dy, 0.0);
var c = getColor(values[index++]);
for (int k = 0; k < 4; k++)
{
colors.Add(c);
}
}
}
// add faces
for (int i = 0; i < verts.Count; i += 4)
{
faces.AddFace(i, i + 1, i + 3, i + 2);
}
return(mesh);
}
/// <summary>
/// Converts the field to a colored heightfield mesh.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="field"></param>
/// <param name="getColor"></param>
/// <param name="getHeight"></param>
/// <returns></returns>
public static Mesh ToMesh <T>(this GridField2d <T> field, Func <T, Color> getColor, Func <T, double> getHeight)
where T : struct
{
Mesh mesh = new Mesh();
var verts = mesh.Vertices;
var colors = mesh.VertexColors;
var faces = mesh.Faces;
var values = field.Values;
int index = 0;
for (int j = 0; j < field.CountY; j++)
{
for (int i = 0; i < field.CountX; i++)
{
var t = values[index++];
Vec2d p = field.CoordinateAt(i, j);
verts.Add(p.X, p.Y, getHeight(t));
colors.Add(getColor(t));
}
}
int nx = field.CountX;
int ny = field.CountY;
for (int j = 0; j < ny - 1; j++)
{
for (int i = 0; i < nx - 1; i++)
{
index = field.IndexAtUnsafe(i, j);
faces.AddFace(index, index + 1, index + 1 + nx, index + nx);
}
}
return(mesh);
}
/// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="field"></param>
/// <param name="getColor"></param>
/// <param name="selection"></param>
/// <returns></returns>
public static Mesh MeshSelection <T>(this GridField2d <T> field, Func <T, Color> getColor, IEnumerable <int> selection)
where T : struct
{
var mesh = new Mesh();
var verts = mesh.Vertices;
var colors = mesh.VertexColors;
var faces = mesh.Faces;
var values = field.Values;
(var dx, var dy) = (field.Scale * 0.5);
// add vertices
foreach (int index in selection)
{
var p = field.CoordinateAt(index);
verts.Add(p.X - dx, p.Y - dy, 0.0);
verts.Add(p.X + dx, p.Y - dy, 0.0);
verts.Add(p.X - dx, p.Y + dy, 0.0);
verts.Add(p.X + dx, p.Y + dy, 0.0);
var c = getColor(values[index]);
for (int k = 0; k < 4; k++)
{
colors.Add(c);
}
}
// add faces
for (int i = 0; i < verts.Count; i += 4)
{
faces.AddFace(i, i + 1, i + 3, i + 2);
}
return(mesh);
}