public void TestPickingRay()
{
var ee = new EventExchange(new LogExchange());
var wm = new WindowManager {
Resolution = (1024, 1024)
};
var camera = new PerspectiveCamera(true)
{
Position = Vector3.Zero,
Yaw = 0,
Pitch = 0
};
ee.Attach(wm).Attach(camera);
ee.Raise(new SetFieldOfViewEvent(90), this);
var near = -Vector3.UnitZ * camera.NearDistance;
var proj0 = camera.ProjectWorldToNorm(near);
var projX = camera.ProjectWorldToNorm(near + camera.NearDistance * Vector3.UnitX);
var projY = camera.ProjectWorldToNorm(near + camera.NearDistance * Vector3.UnitY);
var projZ = camera.ProjectWorldToNorm(near - camera.NearDistance * Vector3.UnitZ);
var z2 = Vector3.UnitZ * (1.0f + camera.NearDistance / (camera.FarDistance - camera.NearDistance)) / 2;
Assert.Equal(Vector3.Zero, proj0);
Assert.Equal(Vector3.UnitX, projX);
Assert.Equal(Vector3.UnitY, projY);
Assert.Equal(z2, projZ);
var proj2 = camera.ProjectWorldToNorm(2 * near);
var proj2X = camera.ProjectWorldToNorm(2 * (near + camera.NearDistance * Vector3.UnitX));
var proj2Y = camera.ProjectWorldToNorm(2 * (near + camera.NearDistance * Vector3.UnitY));
var proj2Z = camera.ProjectWorldToNorm(2 * (near - camera.NearDistance * Vector3.UnitZ));
Assert.Equal(z2, proj2);
Assert.Equal(z2 + Vector3.UnitX, proj2X);
Assert.Equal(z2 + Vector3.UnitY, proj2Y);
Assert.Equal(z2 * 1.5f, proj2Z);
Assert.Equal(near, camera.UnprojectNormToWorld(proj0));
Assert.Equal(near + camera.NearDistance * Vector3.UnitX, camera.UnprojectNormToWorld(projX));
Assert.Equal(near + camera.NearDistance * Vector3.UnitY, camera.UnprojectNormToWorld(projY));
Assert.Equal(near - camera.NearDistance * Vector3.UnitZ, camera.UnprojectNormToWorld(projZ));
}
