/// <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>
/// Applies a 3d rotation on the face and returns the face thats closest to the rotated face
/// </summary>
/// <param name="radX"></param>
/// <param name="radY"></param>
/// <param name="radZ"></param>
/// <returns></returns>
public BlockFacing FaceWhenRotatedBy(float radX, float radY, float radZ)
{
float[] matrix = Mat4f.Create();
Mat4f.RotateX(matrix, matrix, radX);
Mat4f.RotateY(matrix, matrix, radY);
Mat4f.RotateZ(matrix, matrix, radZ);
float[] pos = new float[] { Normalf.X, Normalf.Y, Normalf.Z, 1 };
pos = Mat4f.MulWithVec4(matrix, pos);
float smallestAngle = GameMath.PI;
BlockFacing facing = null;
for (int i = 0; i < ALLFACES.Length; i++)
{
BlockFacing f = ALLFACES[i];
float angle = (float)Math.Acos(f.Normalf.Dot(pos));
if (angle < smallestAngle)
{
smallestAngle = angle;
facing = f;
}
}
return(facing);
}
/// <summary>
/// Performs a 3-dimensional rotation on the cuboid and returns a new axis-aligned cuboid resulting from this rotation. Not sure it it makes any sense to use this for other rotations than 90 degree intervals.
/// </summary>
public Cuboidf RotatedCopy(float degX, float degY, float degZ, Vec3d origin)
{
float radX = degX * GameMath.DEG2RAD;
float radY = degY * GameMath.DEG2RAD;
float radZ = degZ * GameMath.DEG2RAD;
float[] matrix = Mat4f.Create();
Mat4f.RotateX(matrix, matrix, radX);
Mat4f.RotateY(matrix, matrix, radY);
Mat4f.RotateZ(matrix, matrix, radZ);
float[] min = new float[] { X1 - (float)origin.X, Y1 - (float)origin.Y, Z1 - (float)origin.Z, 1 };
float[] max = new float[] { X2 - (float)origin.X, Y2 - (float)origin.Y, Z2 - (float)origin.Z, 1 };
min = Mat4f.MulWithVec4(matrix, min);
max = Mat4f.MulWithVec4(matrix, max);
float tmp;
if (max[0] < min[0])
{
tmp = max[0];
max[0] = min[0];
min[0] = tmp;
}
if (max[1] < min[1])
{
tmp = max[1];
max[1] = min[1];
min[1] = tmp;
}
if (max[2] < min[2])
{
tmp = max[2];
max[2] = min[2];
min[2] = tmp;
}
Cuboidf cube = new Cuboidf()
{
X1 = min[0] + (float)origin.X,
Y1 = min[1] + (float)origin.Y,
Z1 = min[2] + (float)origin.Z,
X2 = max[0] + (float)origin.X,
Y2 = max[1] + (float)origin.Y,
Z2 = max[2] + (float)origin.Z
};
return(cube);
}
