private void makeIndicesSetData()
{
// set indices clockwise from point of view ... surfaces really left handed
int i = 0;
for (int z = 0; z < height - 1; z++)
{
for (int x = 0; x < width - 1; x++)
{
indices[i++] = z * width + x;
indices[i++] = z * width + x + 1;
indices[i++] = (z + 1) * width + x;
indices[i++] = (z + 1) * width + x;
indices[i++] = z * width + x + 1;
indices[i++] = (z + 1) * width + x + 1;
}
}
// create VertexBuffer and store on GPU
vb = new VertexBuffer(display, typeof(VertexPositionColor), vertex.Length, BufferUsage.WriteOnly);
vb.SetData <VertexPositionColor>(vertex); // , 0, vertex.Length);
// create IndexBuffer and store on GPU
ib = new IndexBuffer(display, typeof(int), indices.Length, BufferUsage.WriteOnly);
IB.SetData <int>(indices);
}
public Terrain(Scene aScene, string label, Vector3 position, Vector3 orientAxis, float radians, string heightFile, string colorFile)
: base(aScene, label, position, orientAxis, radians)
{
int i;
range = scene.Range;
width = height = range;
nVertices = width * height;
terrainHeight = new int[width, height];
vertex = new VertexPositionColor[nVertices];
nIndices = (width - 1) * (height - 1) * 6;
indices = new int[nIndices]; // there are 6 indices 2 faces / 4 vertices
spacing = scene.Spacing;
// set display information
display = scene.Display;
effect = scene.SceneEffect;
vertexDeclaration = new VertexDeclaration(display, VertexPositionColor.VertexElements);
// create heightMap values from heightTexture
heightTexture = scene.Content.Load <Texture2D>(heightFile);
heightMap = new Microsoft.Xna.Framework.Graphics.Color[width * height];
heightTexture.GetData <Microsoft.Xna.Framework.Graphics.Color>(heightMap);
// create colorMap values from colorTexture
colorTexture = scene.Content.Load <Texture2D>(colorFile);
colorMap = new Microsoft.Xna.Framework.Graphics.Color[width * height];
colorTexture.GetData <Microsoft.Xna.Framework.Graphics.Color>(colorMap);
// create vertices for terrain
Vector4 vector4;
int vertexHeight;
i = 0;
for (int z = 0; z < height; z++)
{
for (int x = 0; x < width; x++)
{
vector4 = heightMap[i].ToVector4(); // convert packed Rgba32 values to floats
vertexHeight = (int)(vector4.X * 255); // scale vertexHeight 0..255
vertexHeight *= multiplier; // multiply height
terrainHeight[x, z] = vertexHeight; // save height for navigation
vertex[i] = new VertexPositionColor(
new Vector3(x * spacing, vertexHeight, z * spacing),
new Color(colorMap[i].ToVector4())
);
i++;
}
}
// free up unneeded maps
colorMap = null;
heightMap = null;
// set indices clockwise from point of view
i = 0;
for (int z = 0; z < height - 1; z++)
{
for (int x = 0; x < width - 1; x++)
{
indices[i++] = z * width + x;
indices[i++] = z * width + x + 1;
indices[i++] = (z + 1) * width + x;
indices[i++] = (z + 1) * width + x;
indices[i++] = z * width + x + 1;
indices[i++] = (z + 1) * width + x + 1;
}
}
// create VertexBuffer and store on GPU
vb = new VertexBuffer(display, VertexPositionColor.SizeInBytes * vertex.Length, BufferUsage.WriteOnly);
vb.SetData <VertexPositionColor>(vertex, 0, vertex.Length);
// create IndexBuffer and store on GPU
ib = new IndexBuffer(display, typeof(int), indices.Length, BufferUsage.WriteOnly);
IB.SetData <int>(indices);
}
