/// <summary>
/// Rotates the face by given angle and returns the interpolated brightness of this face.
/// </summary>
/// <param name="radX"></param>
/// <param name="radY"></param>
/// <param name="radZ"></param>
/// <param name="BlockSideBrightnessByFacing">Array of brightness values between 0 and 1 per face. In index order (N, E, S, W, U, D)</param>
/// <returns></returns>
public float GetFaceBrightness(float radX, float radY, float radZ, float[] BlockSideBrightnessByFacing)
{
float[] matrix = Mat4f.Create();
Mat4f.RotateX(matrix, matrix, radX);
Mat4f.RotateY(matrix, matrix, radY);
Mat4f.RotateZ(matrix, matrix, radZ);
FastVec3f pos = Mat4f.MulWithVec3(matrix, Normalf.X, Normalf.Y, Normalf.Z);
float brightness = 0;
for (int i = 0; i < ALLFACES.Length; i++)
{
BlockFacing f = ALLFACES[i];
float angle = (float)Math.Acos(f.Normalf.Dot(pos));
if (angle >= GameMath.PIHALF)
{
continue;
}
brightness += (1 - angle / GameMath.PIHALF) * BlockSideBrightnessByFacing[f.Index];
}
return(brightness);
}
/// <summary>
/// Calculates the distance the two endpoints
/// </summary>
/// <param name="vec"></param>
/// <returns></returns>
public float Distance(FastVec3f vec)
{
return((float)Math.Sqrt(
(X - vec.X) * (X - vec.X) +
(Y - vec.Y) * (Y - vec.Y) +
(Z - vec.Z) * (Z - vec.Z)
));
}
public float Dot(FastVec3f a)
{
return(X * a.X + Y * a.Y + Z * a.Z);
}
/// <summary>
/// Sets the vector to the coordinates of given vector
/// </summary>
/// <param name="vec"></param>
public void Set(FastVec3f vec)
{
this.X = (float)vec.X;
this.Y = (float)vec.Y;
this.Z = (float)vec.Z;
}
/// <summary>
/// Adds both vectors into a new vector. Both source vectors remain unchanged.
/// </summary>
/// <param name="vec"></param>
/// <returns></returns>
public FastVec3f AddCopy(FastVec3f vec)
{
return(new FastVec3f(X + vec.X, Y + vec.Y, Z + vec.Z));
}