private void CalculateNormals(ref VertexMultitextured[] terrainVertices)
{
for (int i = 0; i < terrainVertices.Length; i++)
terrainVertices[i].Normal = new Vector3(0, 0, 0);
for (int i = 0; i < indices.Length / 3; i++)
{
int index1 = indices[i * 3];
int index2 = indices[i * 3 + 1];
int index3 = indices[i * 3 + 2];
Vector3 side1 = terrainVertices[index1].Position - terrainVertices[index3].Position;
Vector3 side2 = terrainVertices[index1].Position - terrainVertices[index2].Position;
Vector3 normal = Vector3.Cross(side1, side2);
terrainVertices[index1].Normal += normal;
terrainVertices[index2].Normal += normal;
terrainVertices[index3].Normal += normal;
}
for (int i = 0; i < terrainVertices.Length; i++)
terrainVertices[i].Normal.Normalize();
}
public void CreateTerrain()
{
VertexMultitextured[] terrainVertices = new VertexMultitextured[terrainWidth * terrainHeight];
for (int x = 0; x < terrainWidth; x++)
{
for (int y = 0; y < terrainHeight; y++)
{
float height = heightMap[x, y];// GetHeight(x, y); //* 10 +20;
terrainVertices[x + y * terrainWidth].Position = new Vector3(x, heightMap[x, y], y);
terrainVertices[x + y * terrainWidth].TextureCoordinate.X = (float)x / 30.0f;
terrainVertices[x + y * terrainWidth].TextureCoordinate.Y = (float)y / 30.0f;
terrainVertices[x + y * terrainWidth].TexWeights.X = MathHelper.Clamp(1.0f - Math.Abs(height - 0) / 8.0f, 0, 1);
terrainVertices[x + y * terrainWidth].TexWeights.Y = MathHelper.Clamp(1.0f - Math.Abs(height - 12) / 6.0f, 0, 1);
terrainVertices[x + y * terrainWidth].TexWeights.Z = MathHelper.Clamp(1.0f - Math.Abs(height - 20) / 6.0f, 0, 1);
terrainVertices[x + y * terrainWidth].TexWeights.W = MathHelper.Clamp(1.0f - Math.Abs(height - 30) / 6.0f, 0, 1);
float total = terrainVertices[x + y * terrainWidth].TexWeights.X;
total += terrainVertices[x + y * terrainWidth].TexWeights.Y;
total += terrainVertices[x + y * terrainWidth].TexWeights.Z;
total += terrainVertices[x + y * terrainWidth].TexWeights.W;
terrainVertices[x + y * terrainWidth].TexWeights.X /= total;
terrainVertices[x + y * terrainWidth].TexWeights.Y /= total;
terrainVertices[x + y * terrainWidth].TexWeights.Z /= total;
terrainVertices[x + y * terrainWidth].TexWeights.W /= total;
/* vertexArray.Add(new VertexMultitextured(new Vector3(i, heightMap[i, j], j),
new Color(0, 0, (byte)(heightMap[i, j]*10+20),255),));*/
}
}
SetUpIndices();
CalculateNormals(ref terrainVertices);
vertexPositionColor = terrainVertices;
PrepareBuffers();
//LightDirection = new Vector3(0.5f, -0.7f, -1.0f);
LightDirection = new Vector3(1.0f, -1.0f, -1.0f);
LightDirection.Normalize();
}