public static bool CanSee(GraphicsDevice graphics, World world, Camera camera, Vector3 target, int maxDistance)
{
var projectionMatrix = camera.ProjectionMatrix;
var viewMatrix = camera.ViewMatrix;
var nearsource = new Vector3(graphics.Viewport.Width / 2f,
graphics.Viewport.Height / 2f, 0f);
var farsource = new Vector3(graphics.Viewport.Width / 2f,
graphics.Viewport.Height / 2f, 1f);
var nearPoint = graphics.Viewport.Unproject(nearsource,
projectionMatrix, viewMatrix, Matrix.Identity);
var farPoint = graphics.Viewport.Unproject(farsource,
projectionMatrix, viewMatrix, Matrix.Identity);
var direction = farPoint - nearPoint;
direction.Normalize();
var plotter = new PlotCell3f(new Vector3(1, 1, 1));
var myPosition = camera.Position;
var d = (target - myPosition);
d.Normalize();
plotter.Plot(myPosition, d, maxDistance ^ 2);
while (plotter.Next())
{
var v = plotter.Get();
var b = (Block)world.GetBlock(v);
if (b != null && b.Renderable && b.HasHitbox && b.GetBoundingBox(v.Floor()).Intersects(new BoundingBox(v, v)))
{
plotter.End();
return(false);
}
if (Vector3.DistanceSquared(v, target) < 1f)
{
return(true);
}
}
return(false);
}
public static Vector3 Raytrace(GraphicsDevice graphics, World world, Camera camera)
{
var projectionMatrix = camera.ProjectionMatrix;
var viewMatrix = camera.ViewMatrix;
var nearsource = new Vector3(graphics.Viewport.Width / 2f,
graphics.Viewport.Height / 2f, 0f);
var farsource = new Vector3(graphics.Viewport.Width / 2f,
graphics.Viewport.Height / 2f, 1f);
var nearPoint = graphics.Viewport.Unproject(nearsource,
projectionMatrix, viewMatrix, Matrix.Identity);
var farPoint = graphics.Viewport.Unproject(farsource,
projectionMatrix, viewMatrix, Matrix.Identity);
var direction = farPoint - nearPoint;
direction.Normalize();
var plotter = new PlotCell3f(new Vector3(1, 1, 1));
plotter.Plot(camera.Position, direction, 5 * 2);
while (plotter.Next())
{
var v = plotter.Get();
var b = (Block)world.GetBlock(v);
if (b != null && b.Renderable && b.HasHitbox && b.GetBoundingBox(v.Floor()).Intersects(new BoundingBox(v, v)))
{
plotter.End();
return(v);
}
}
return(new Vector3(0, -255, 0));
}
