internal static Matrixd CreateLookAt(Vector3d cameraPosition, Vector3d cameraTarget, Vector3d cameraUpVector)
{
Matrixd result = new Matrixd();
var vector = Vector3d.Normalize(cameraPosition - cameraTarget);
var vector2 = Vector3d.Normalize(Vector3d.Cross(cameraUpVector, vector));
var vector3 = Vector3d.Cross(vector, vector2);
result.M11 = vector2.X;
result.M12 = vector3.X;
result.M13 = vector.X;
result.M14 = 0f;
result.M21 = vector2.Y;
result.M22 = vector3.Y;
result.M23 = vector.Y;
result.M24 = 0f;
result.M31 = vector2.Z;
result.M32 = vector3.Z;
result.M33 = vector.Z;
result.M34 = 0f;
result.M41 = -Vector3d.Dot(vector2, cameraPosition);
result.M42 = -Vector3d.Dot(vector3, cameraPosition);
result.M43 = -Vector3d.Dot(vector, cameraPosition);
result.M44 = 1f;
return(result);
}
internal static Matrixd CreatePerspectiveFieldOfView(double fieldOfView, double aspectRatio, double nearPlaneDistance, double farPlaneDistance)
{
Matrixd result = new Matrixd();
if ((fieldOfView <= 0f) || (fieldOfView >= 3.141593f))
{
throw new ArgumentException("fieldOfView <= 0 or >= PI");
}
if (nearPlaneDistance <= 0f)
{
throw new ArgumentException("nearPlaneDistance <= 0");
}
if (farPlaneDistance <= 0f)
{
throw new ArgumentException("farPlaneDistance <= 0");
}
if (nearPlaneDistance >= farPlaneDistance)
{
throw new ArgumentException("nearPlaneDistance >= farPlaneDistance");
}
double num = 1f / Math.Tan(fieldOfView * 0.5);
double num9 = num / aspectRatio;
result.M11 = num9;
result.M12 = result.M13 = result.M14 = 0;
result.M22 = num;
result.M21 = result.M23 = result.M24 = 0;
result.M31 = result.M32 = 0f;
result.M33 = farPlaneDistance / (nearPlaneDistance - farPlaneDistance);
result.M34 = -1;
result.M41 = result.M42 = result.M44 = 0;
result.M43 = (nearPlaneDistance * farPlaneDistance) / (nearPlaneDistance - farPlaneDistance);
return(result);
}
internal static Vector3d Transform(Vector3d position, Matrixd matrix)
{
var x = (position.X * matrix.M11) + (position.Y * matrix.M21) + (position.Z * matrix.M31) + matrix.M41;
var y = (position.X * matrix.M12) + (position.Y * matrix.M22) + (position.Z * matrix.M32) + matrix.M42;
var z = (position.X * matrix.M13) + (position.Y * matrix.M23) + (position.Z * matrix.M33) + matrix.M43;
return(new Vector3d(x, y, z));
}
// more accurate version
internal static Rayd CastFromCamera(GraphicsDevice graphicsDevice, double x, double y, Matrixd projection, Matrixd view, Matrixd world)
{
// close enough to the camera position for me, I think it's a position on the near clip plane
Vector3d unprojected = Matrixd.Unproject(graphicsDevice.Viewport, new Vector3d(x, y, 0), projection, view, world);
Vector3d unprojected2 = Matrixd.Unproject(graphicsDevice.Viewport, new Vector3d(x, y, 1), projection, view, world);
return(new Rayd(unprojected, unprojected2 - unprojected));
}
internal static Matrixd CreateRotationZ(double radians)
{
var result = Matrixd.Identity();
var val1 = Math.Cos(radians);
var val2 = Math.Sin(radians);
result.M11 = val1;
result.M12 = val2;
result.M21 = -val2;
result.M22 = val1;
return(result);
}
internal static Vector3d Unproject(Viewport viewport, Vector3d source, Matrixd projection, Matrixd view, Matrixd world)
{
//return new Vector3d(viewport.Unproject(source.ToVector3(), projection.toMatrix(), view.toMatrix(), world.toMatrix()));
Matrixd matrix = Matrixd.Invert(Matrixd.Multiply(Matrixd.Multiply(world, view), projection));
Vector3d source2 = new Vector3d(0, 0, 0);
source2.X = (((source.X - viewport.X) / (viewport.Width)) * 2f) - 1f;
source2.Y = -((((source.Y - viewport.Y) / (viewport.Height)) * 2f) - 1f);
source2.Z = (source.Z - viewport.MinDepth) / (viewport.MaxDepth - viewport.MinDepth);
Vector3d vector = Vector3d.Transform(source2, matrix);
double a = (((source2.X * matrix.M14) + (source2.Y * matrix.M24)) + (source2.Z * matrix.M34)) + matrix.M44;
if (!WithinEpsilon(a, 1f))
{
vector.X = vector.X / a;
vector.Y = vector.Y / a;
vector.Z = vector.Z / a;
}
return(vector);
}
public static Matrixd Multiply(Matrixd matrix1, Matrixd matrix2)
{
var m11 = (((matrix1.M11 * matrix2.M11) + (matrix1.M12 * matrix2.M21)) + (matrix1.M13 * matrix2.M31)) + (matrix1.M14 * matrix2.M41);
var m12 = (((matrix1.M11 * matrix2.M12) + (matrix1.M12 * matrix2.M22)) + (matrix1.M13 * matrix2.M32)) + (matrix1.M14 * matrix2.M42);
var m13 = (((matrix1.M11 * matrix2.M13) + (matrix1.M12 * matrix2.M23)) + (matrix1.M13 * matrix2.M33)) + (matrix1.M14 * matrix2.M43);
var m14 = (((matrix1.M11 * matrix2.M14) + (matrix1.M12 * matrix2.M24)) + (matrix1.M13 * matrix2.M34)) + (matrix1.M14 * matrix2.M44);
var m21 = (((matrix1.M21 * matrix2.M11) + (matrix1.M22 * matrix2.M21)) + (matrix1.M23 * matrix2.M31)) + (matrix1.M24 * matrix2.M41);
var m22 = (((matrix1.M21 * matrix2.M12) + (matrix1.M22 * matrix2.M22)) + (matrix1.M23 * matrix2.M32)) + (matrix1.M24 * matrix2.M42);
var m23 = (((matrix1.M21 * matrix2.M13) + (matrix1.M22 * matrix2.M23)) + (matrix1.M23 * matrix2.M33)) + (matrix1.M24 * matrix2.M43);
var m24 = (((matrix1.M21 * matrix2.M14) + (matrix1.M22 * matrix2.M24)) + (matrix1.M23 * matrix2.M34)) + (matrix1.M24 * matrix2.M44);
var m31 = (((matrix1.M31 * matrix2.M11) + (matrix1.M32 * matrix2.M21)) + (matrix1.M33 * matrix2.M31)) + (matrix1.M34 * matrix2.M41);
var m32 = (((matrix1.M31 * matrix2.M12) + (matrix1.M32 * matrix2.M22)) + (matrix1.M33 * matrix2.M32)) + (matrix1.M34 * matrix2.M42);
var m33 = (((matrix1.M31 * matrix2.M13) + (matrix1.M32 * matrix2.M23)) + (matrix1.M33 * matrix2.M33)) + (matrix1.M34 * matrix2.M43);
var m34 = (((matrix1.M31 * matrix2.M14) + (matrix1.M32 * matrix2.M24)) + (matrix1.M33 * matrix2.M34)) + (matrix1.M34 * matrix2.M44);
var m41 = (((matrix1.M41 * matrix2.M11) + (matrix1.M42 * matrix2.M21)) + (matrix1.M43 * matrix2.M31)) + (matrix1.M44 * matrix2.M41);
var m42 = (((matrix1.M41 * matrix2.M12) + (matrix1.M42 * matrix2.M22)) + (matrix1.M43 * matrix2.M32)) + (matrix1.M44 * matrix2.M42);
var m43 = (((matrix1.M41 * matrix2.M13) + (matrix1.M42 * matrix2.M23)) + (matrix1.M43 * matrix2.M33)) + (matrix1.M44 * matrix2.M43);
var m44 = (((matrix1.M41 * matrix2.M14) + (matrix1.M42 * matrix2.M24)) + (matrix1.M43 * matrix2.M34)) + (matrix1.M44 * matrix2.M44);
return(new Matrixd(m11, m12, m13, m14, m21, m22, m23, m24, m31, m32, m33, m34, m41, m42, m43, m44));
}
public static Matrixd CreateOrthographicOffCenter(double left, double right, double bottom, double top, double zNearPlane, double zFarPlane)
{
Matrixd result = new Matrixd();
result.M11 = (2.0 / (right - left));
result.M12 = 0.0f;
result.M13 = 0.0f;
result.M14 = 0.0f;
result.M21 = 0.0f;
result.M22 = (2.0 / (top - bottom));
result.M23 = 0.0f;
result.M24 = 0.0f;
result.M31 = 0.0f;
result.M32 = 0.0f;
result.M33 = (1.0 / (zNearPlane - zFarPlane));
result.M34 = 0.0f;
result.M41 = ((left + right) / (left - right));
result.M42 = ((top + bottom) / (bottom - top));
result.M43 = (zNearPlane / (zNearPlane - zFarPlane));
result.M44 = 1.0f;
return(result);
}
public static Matrixd operator *(Matrixd matrix1, Matrixd matrix2)
{
return(Matrixd.Multiply(matrix1, matrix2));
}
public static Matrixd Invert(Matrixd matrix)
{
Matrixd result = new Matrixd();
double num1 = matrix.M11;
double num2 = matrix.M12;
double num3 = matrix.M13;
double num4 = matrix.M14;
double num5 = matrix.M21;
double num6 = matrix.M22;
double num7 = matrix.M23;
double num8 = matrix.M24;
double num9 = matrix.M31;
double num10 = matrix.M32;
double num11 = matrix.M33;
double num12 = matrix.M34;
double num13 = matrix.M41;
double num14 = matrix.M42;
double num15 = matrix.M43;
double num16 = matrix.M44;
double num17 = (num11 * num16 - num12 * num15);
double num18 = (num10 * num16 - num12 * num14);
double num19 = (num10 * num15 - num11 * num14);
double num20 = (num9 * num16 - num12 * num13);
double num21 = (num9 * num15 - num11 * num13);
double num22 = (num9 * num14 - num10 * num13);
double num23 = (num6 * num17 - num7 * num18 + num8 * num19);
double num24 = -(num5 * num17 - num7 * num20 + num8 * num21);
double num25 = (num5 * num18 - num6 * num20 + num8 * num22);
double num26 = -(num5 * num19 - num6 * num21 + num7 * num22);
double num27 = (1.0 / (num1 * num23 + num2 * num24 + num3 * num25 + num4 * num26));
result.M11 = num23 * num27;
result.M21 = num24 * num27;
result.M31 = num25 * num27;
result.M41 = num26 * num27;
result.M12 = -(num2 * num17 - num3 * num18 + num4 * num19) * num27;
result.M22 = (num1 * num17 - num3 * num20 + num4 * num21) * num27;
result.M32 = -(num1 * num18 - num2 * num20 + num4 * num22) * num27;
result.M42 = (num1 * num19 - num2 * num21 + num3 * num22) * num27;
double num28 = (num7 * num16 - num8 * num15);
double num29 = (num6 * num16 - num8 * num14);
double num30 = (num6 * num15 - num7 * num14);
double num31 = (num5 * num16 - num8 * num13);
double num32 = (num5 * num15 - num7 * num13);
double num33 = (num5 * num14 - num6 * num13);
result.M13 = (num2 * num28 - num3 * num29 + num4 * num30) * num27;
result.M23 = -(num1 * num28 - num3 * num31 + num4 * num32) * num27;
result.M33 = (num1 * num29 - num2 * num31 + num4 * num33) * num27;
result.M43 = -(num1 * num30 - num2 * num32 + num3 * num33) * num27;
double num34 = (num7 * num12 - num8 * num11);
double num35 = (num6 * num12 - num8 * num10);
double num36 = (num6 * num11 - num7 * num10);
double num37 = (num5 * num12 - num8 * num9);
double num38 = (num5 * num11 - num7 * num9);
double num39 = (num5 * num10 - num6 * num9);
result.M14 = -(num2 * num34 - num3 * num35 + num4 * num36) * num27;
result.M24 = (num1 * num34 - num3 * num37 + num4 * num38) * num27;
result.M34 = -(num1 * num35 - num2 * num37 + num4 * num39) * num27;
result.M44 = (num1 * num36 - num2 * num38 + num3 * num39) * num27;
return(result);
}
