public override void Draw(RenderContext renderContext, GameTime gameTime)
{
if (renderContext.layerPass != RenderContext.LayerPass.MAIN_PASS)
{
return;
}
if (Game1.RECORDING)
{
MoveShip(renderContext.graphicsDevice);
}
SphereVector unitPosition = new SphereVector(position.Normalized());
SphereVector up = unitPosition.WalkNorth(Math.PI / 2);
SphereVector right = new SphereVector(up.Cross(unitPosition).Normalized());
double rotation = Math.Atan2(forward.Dot(-right), forward.Dot(up)); // we want up to be 0 and a positive rotation to be cw
Matrixd shipWVP = CreateShipWVP(renderContext, rotation);
foreach (ModelMesh mesh in GlobalContent.StartingShuttle.Meshes)
{
foreach (BasicEffect eff in mesh.Effects)
{
eff.EnableDefaultLighting();
eff.World = shipWVP.toMatrix();
eff.VertexColorEnabled = false;
eff.Alpha = 1;
}
mesh.Draw();
}
}
private Matrixd CreateShipWVP(RenderContext renderContext, double rotation)
{
double fakeScale = Math.Max(Math.Pow(2, 21 - camera.cameraZoom), 1); // make the ship bigger to account for depth buffer limitations
Vector3d shipPos = position;
// earth radius 6371 km
double shipScale = fakeScale / 6371000;
double distanceFromCamera = 30; // in meters
Matrixd world = Matrixd.CreateRotationZ(-camera.cameraRotX) * Matrixd.CreateRotationX(camera.cameraRotY); // eh.... think hard on this later
double distance = 9 * Math.Pow(0.5, camera.cameraZoom);
shipPos += position.WalkNorth(-Math.PI / 4) * (distance * 2 - distanceFromCamera * shipScale); // why distance * 2??
Matrixd view = CameraMatrixManager.GetWorldViewd(distance);
Matrixd projection = CameraMatrixManager.GetWorldProjectiond(distance, renderContext.graphicsDevice.Viewport.AspectRatio);
Matrixd worldWVP = world * view * projection;
Matrixd shipRot = Matrixd.CreateRotationZ(rotation + Math.PI) * Matrixd.CreateRotationX(Math.PI / 2 - camera.cameraRotY) * Matrixd.CreateRotationZ(camera.cameraRotX);
return(shipRot * Matrixd.CreateScale(shipScale) * Matrixd.CreateTranslation(shipPos) * worldWVP);
}
public double RotateWithMouse(GraphicsDevice graphicsDevice)
{
SphereVector unitPosition = new SphereVector(position.Normalized());
SphereVector up2 = unitPosition.WalkNorth(Math.PI / 2);
SphereVector right2 = new SphereVector(up2.Cross(unitPosition).Normalized());
double screenSpaceRotation = Math.Atan2(-forward.Dot(up2), forward.Dot(right2)); // we want up to be 0 and a positive rotation to be cw
Point mousePos = Mouse.GetState().Position;
Vector2d mouseV = new Vector2d((mousePos.X / (double)graphicsDevice.Viewport.Width - 0.5) * graphicsDevice.Viewport.AspectRatio, mousePos.Y / (double)graphicsDevice.Viewport.Height - 0.5);
double mouseRotation = Math.Atan2(mouseV.Y, mouseV.X);
double diff1 = (mouseRotation + 4 * Math.PI - screenSpaceRotation) % (2 * Math.PI);
double diff2 = (screenSpaceRotation + 4 * Math.PI - mouseRotation) % (2 * Math.PI);
double rotationSpeed;
if (diff1 < diff2)
{
return(diff1 / 10);
}
else
{
return(-diff2 / 10);
}
}
