/// <summary>
/// Generate a flat plane.
/// </summary>
/// <param name="size">Size of the plane.</param>
/// <param name="vertexCount">Number of vertex per side.</param>
/// <param name="textureRepeate">Number of texture repeate.</param>
/// <returns>A flat plane.</returns>
public static Model GeneratePlane(float size, int vertexCount, int textureRepeate, IHeightMap heightMap)
{
int count = vertexCount * vertexCount;
Vertex[] vertecies = new Vertex[count];
int[] indices = new int[6 * (vertexCount - 1) * (vertexCount - 1)];
int vertexPointer = 0;
for (int y = 0; y < vertexCount; y++)
{
for (int x = 0; x < vertexCount; x++)
{
Vector2 vertexPosition = new Vector2((size / (vertexCount - 1)) * x, (size / (vertexCount - 1)) * y);
vertecies[vertexPointer] = new Vertex(new Vector3(vertexPosition.X, heightMap.GetHeight(x / (float)vertexCount, y / (float)vertexCount), vertexPosition.Y),
heightMap.GetNormal(x / (float)vertexCount, y / (float)vertexCount),
new Point2D(x / ((float)vertexCount - 1) * textureRepeate, (float)y / ((float)vertexCount - 1) * textureRepeate));
vertexPointer++;
}
}
int pointer = 0;
for (int y = 0; y < vertexCount - 1; y++)
{
for (int x = 0; x < vertexCount - 1; x++)
{
int topLeft = (y * vertexCount) + x;
int topRight = topLeft + 1;
int bottomLeft = ((y + 1) * vertexCount) + x;
int bottomRight = bottomLeft + 1;
indices[pointer++] = topLeft;
indices[pointer++] = bottomLeft;
indices[pointer++] = topRight;
indices[pointer++] = topRight;
indices[pointer++] = bottomLeft;
indices[pointer++] = bottomRight;
}
}
return(new Model(vertecies, indices));
}
public static Mesh3V3N CreateFromHeightMap(int columns, int rows, IHeightMap heightMap)
{
var vertices = new List <Vertex3V3N>();
for (var x = 0; x <= columns; x++)
{
for (var y = 0; y <= rows; y++)
{
var height = heightMap.GetHeight(x, y);
vertices.Add(new Vertex3V3N
{
Position = new Vector3(x, (float)height, y),
Normal = (Vector3)heightMap.GetNormal(x, y)
});
}
}
var faces = CreateFaces(columns, rows);
return(new Mesh3V3N(vertices, faces).Transformed(Matrix4.CreateTranslation(-columns / 2f, 0, -rows / 2f) * Matrix4.CreateScale((float)(1.0 / columns), 1, (float)(1.0 / rows))));
}
public static Mesh3V3N CreateFromHeightMap(int columns, int rows, IHeightMap heightMap)
{
var vertices = new List<Vertex3V3N>();
for (var x = 0; x <= columns; x++)
{
for (var y = 0; y <= rows; y++)
{
var height = heightMap.GetHeight(x, y);
vertices.Add(new Vertex3V3N
{
Position = new Vector3(x, (float)height, y),
Normal = (Vector3)heightMap.GetNormal(x, y)
});
}
}
var faces = new List<Face3>();
for (var x = 0; x < columns; x++)
{
for (var y = 0; y < rows; y++)
{
var verticesInColumn = rows + 1;
var v0 = x * verticesInColumn + y;
var v1 = (x + 1) * verticesInColumn + y;
var v2 = (x + 1) * verticesInColumn + y + 1;
var v3 = x * verticesInColumn + y + 1;
Face3 f0;
Face3 f1;
if (y % 2 == 0)
{
if (x % 2 == 0)
{
f0 = new Face3 { V0 = v0, V1 = v1, V2 = v2 };
f1 = new Face3 { V0 = v0, V1 = v2, V2 = v3 };
}
else
{
f0 = new Face3 { V0 = v0, V1 = v1, V2 = v3 };
f1 = new Face3 { V0 = v1, V1 = v2, V2 = v3 };
}
}
else
{
if (x % 2 == 0)
{
f0 = new Face3 { V0 = v0, V1 = v1, V2 = v3 };
f1 = new Face3 { V0 = v1, V1 = v2, V2 = v3 };
}
else
{
f0 = new Face3 { V0 = v0, V1 = v1, V2 = v2 };
f1 = new Face3 { V0 = v0, V1 = v2, V2 = v3 };
}
}
faces.Add(f0);
faces.Add(f1);
}
}
return new Mesh3V3N(vertices, faces).Transformed(Matrix4.CreateTranslation(-columns / 2, 0, -rows / 2) * Matrix4.CreateScale((float)(1.0 / columns), 1, (float)(1.0 / rows)));
}