/// <summary>
///
/// </summary>
/// <param name="selectRay">A ray in Xna Coords that was cast according to the viewport</param>
/// <param name="add">Whether to add the selected triangle to the selection</param>
public void UpdateSelectedTriangle(Ray selectRay, bool add)
{
if (!add)
{
Vertices.Clear();
Indices.Clear();
}
var pos3D = selectRay.Position;
var dir3D = selectRay.Direction;
PositionUtil.TransformXnaCoordsToWoWCoords(ref pos3D);
PositionUtil.TransformXnaCoordsToWoWCoords(ref dir3D);
var ray3D = new Ray(pos3D, dir3D);
var pos2D = new Vector2(pos3D.X, pos3D.Y);
var dir2D = new Vector2(dir3D.X, dir3D.Y).NormalizedCopy();
var ray2D = new Ray2D(pos2D, dir2D);
var closestTime = float.MaxValue;
var closestVec0 = Vector3.Zero;
var closestVec1 = Vector3.Zero;
var closestVec2 = Vector3.Zero;
foreach (var tile in _adtManager.MapTiles)
{
var results = new List <Index3>();
if (!tile.GetPotentialColliders(ray2D, results))
{
continue;
}
foreach (var tri in results)
{
var vec0 = tile.TerrainVertices[tri.Index0];
var vec1 = tile.TerrainVertices[tri.Index1];
var vec2 = tile.TerrainVertices[tri.Index2];
float time;
if (!Intersection.RayTriangleIntersect(ray3D, vec0, vec1, vec2, out time))
{
continue;
}
if (time > closestTime)
{
continue;
}
closestTime = time;
closestVec0 = vec0;
closestVec1 = vec1;
closestVec2 = vec2;
}
}
if (closestTime == float.MaxValue)
{
return;
}
AddSelectedTriangle(closestVec0, closestVec1, closestVec2);
}