/// <summary>
/// Change the height of the given vertex and its neighbors with the gaussian bell algroithm
/// </summary>
/// <param name="vertexToChange">index of the vertex to change</param>
/// <param name="heightFactor">factor to change the height</param>
private void useGaussianBell(int indexOfVertexToChange, float heightFactor)
{
int totalSize = DiamondSquareGenerator.getTotalSize(terrain.size);
float widthFactor = 0.02f;
Vector3[] tempVertices = terrain.tempVertices;
Vector3[] vertices = new Vector3[tempVertices.Length];
float[,] diffHeights = terrain.tempDiffHeights;
Color[] colors = new Color[vertices.Length];
Vector3 vertexToChange = tempVertices[indexOfVertexToChange];
for (int index = 0, z = 0; z < totalSize; z++)
{
for (int x = 0; x < totalSize; x++)
{
Vector3 vertex = tempVertices[index];
Vector3 diff = vertex - vertexToChange;
// calculates the distance in x and z direction to between the two vertices
float dist = Mathf.Sqrt(Mathf.Pow(diff.x, 2) + Mathf.Pow(diff.z, 2));
// calculate the height for the current vertex with the gaussian bell algorithm
float diffHeight = Mathf.Exp(-Mathf.Pow(widthFactor * dist, 2)) * heightFactor;
diffHeights[x, z] += diffHeight;
float height = vertex.y + diffHeights[x, z];
vertex.y = height;
vertices[index] = vertex;
colors[index] = terrain.getColorFromHeight(height);
index++;
}
}
terrain.tempDiffHeights = diffHeights;
terrain.updateMesh(vertices, colors);
}