private Vector3 AddNormalToVectorSum(Vector3 sum, XYZType normal)
{
var newSum = new Vector3()
{
X = sum[0] + normal.x,
Y = sum[1] + normal.y,
Z = sum[2] + normal.z
};
return(newSum);
}
private XYZType[] GetNewNormals()
{
var sampleHeight = _size.Height - 1;
var sampleWidth = _size.Width - 1;
var normals = new XYZType[sampleHeight * sampleWidth];
for (var z = 0; z < sampleHeight; ++z)
{
for (var x = 0; x < sampleWidth; ++x)
{
var normal = GetNormalForPosition(x, z);
var sampleIndex = (z * sampleHeight) + x;
normals[sampleIndex] = normal;
}
}
return(normals);
}
private XYZType GetNormalForPosition(int x, int z)
{
var index = GetIndexFromPosition(x, z);
var right = GetRelativeIndex(RelativePosition.Right, index);
var bottom = GetRelativeIndex(RelativePosition.BottomMiddle, index);
var vertex1 = new Vector3(HeightMap[index].x, HeightMap[index].y, HeightMap[index].z);
var vertex2 = new Vector3(HeightMap[right].x, HeightMap[right].y, HeightMap[right].z);
var vertex3 = new Vector3(HeightMap[bottom].x, HeightMap[bottom].y, HeightMap[bottom].z);
var vector1 = vertex1 - vertex3;
var vector2 = vertex3 - vertex2;
var crossProduct = Vector3.Cross(vector1, vector2);
var normal = new XYZType()
{
x = crossProduct.X,
y = crossProduct.Y,
z = crossProduct.Z
};
return(normal);
}