public static Vector3 ProjectMousePosition(Vector2 mousePos, Microsoft.Xna.Framework.Graphics.Viewport viewport, Matrix world, Matrix view, Matrix projection, float depth)
{
Vector3 nearSource = new Vector3(mousePos.X, mousePos.Y, 0);
Vector3 farSource = new Vector3(mousePos.X, mousePos.Y, 1);
Vector3 nearPoint = viewport.Unproject(nearSource, projection, view, world);
Vector3 farPoint = viewport.Unproject(farSource, projection, view, world);
Ray ray = new Ray(nearPoint, Vector3.Normalize(farPoint - nearPoint));
Plane plane = new Plane(new Vector3(0, 0, -1), depth);
float denominator = Vector3.Dot(plane.Normal, ray.Direction);
float numerator = Vector3.Dot(plane.Normal, ray.Position) + plane.D;
float t = -(numerator / denominator);
return(nearPoint + ray.Direction * t);
}
public void UnprojectTest1()
{
Vector3 vector = Utilities.GenerateVector3();
Vector3 vectorExpected = vector;
float x = (float)Math.Floor(Utilities.GenerateFloat());
float y = (float)Math.Floor(Utilities.GenerateFloat());
float width = (float)Math.Floor(Utilities.GenerateFloat() + x);
float height = (float)Math.Floor(Utilities.GenerateFloat() + y);
float minZ = Utilities.GenerateFloat();
float maxZ = Utilities.GenerateFloat() + minZ + 1f;
Matrix worldViewProjection = Utilities.GenerateMatrix();
Matrix worldViewProjectionExpected = worldViewProjection;
Vector3 result;
Microsoft.Xna.Framework.Graphics.Viewport viewport = new Microsoft.Xna.Framework.Graphics.Viewport()
{
X = (int)x,
Y = (int)y,
Width = (int)width,
Height = (int)height,
MinDepth = minZ,
MaxDepth = maxZ
};
Vector3 resultExpected = Utilities.ConvertFrom(viewport.Unproject(
Utilities.ConvertToXna(vector),
Utilities.ConvertToXna(worldViewProjection),
Utilities.ConvertToXna(Matrix.Identity),
Utilities.ConvertToXna(Matrix.Identity)));
Vector3.Unproject(ref vector, x, y, width, height, minZ, maxZ, ref worldViewProjection, out result);
Utilities.AreEqual(vectorExpected, vector);
Utilities.AreEqual(worldViewProjectionExpected, worldViewProjection);
Utilities.AreEqual(resultExpected, result);
}
private Vector3 Unproject(Vector3 vector)
{
//Projects the vector from screen coordinates into 3D space
return(Viewport.Unproject(vector, CameraProjection, view, world * Attitude));
}