[MonoGame] Ray BoundingBox Intersection Bug

φConst · 29. März 2016, 01:39

Guten Abend,
Ist das etwa ein Ray Bug, oder mein Fehler:(Anhang)

Code:

public DefaultCubeStructure? Remove(Ray r, float max_distance)
{
var Chunk = GetChunkArea(Camera3D.CameraPosition);
int? DistanceToCube = null;
DefaultCubeStructure? Cube = null;
if (Chunk != null)
{
for (int i = Chunk.RenderingCubes.Count - 1; i >= 0; i--)
{
int Index = Chunk.RenderingCubes[i];
DistanceToCube = (int?)Chunk.ChunkData[Index].BoundingBox.Intersects(r);
if (DistanceToCube.HasValue && DistanceToCube > (int)max_distance)
{
BoundingBoxRenderer.Render(Chunk.ChunkData[Index].BoundingBox, Global.GlobalShares.GlobalDevice, Camera3D.ViewMatrix, Camera3D.ProjectionMatrix, Color.Red);
Cube = Chunk.ChunkData[Index];
break;
}
}
}
return Cube;
}

Woran liegt das?

Danke.

φConst · 29. März 2016, 17:56

Hab's..

Die Remove-Methode gibt alle Cubes zurück, die vom Ray geschnitten wird.

Einfach nach Distanz sortieren, dann klappt's pefekt.

public IEnumerable<BoundingBox> Remove(Ray r, float max_distance)
{
var Chunk = GetChunkArea(Camera3D.CameraPosition);
float DistanceToCube = .0f;
int Face = 0;
if (Chunk != null)
{
for (int i = Chunk.IndexRenderer.Count - 1; i >= 0; i--)
{
int Index = Chunk.IndexRenderer[i];
DistanceToCube = 0;
if (BoundingBoxRenderer.IntersectRayVsBox(Chunk.ChunkData[Index].BoundingBox, r, out DistanceToCube, out Face))
yield return Chunk.ChunkData[Index].BoundingBox;
}
}
}

Zur Extraktion des Würfels, dass anvisiert ist:

var Value = ChunkManager.Remove(Camera3D.Ray, 13).ToList();
Value = Value.OrderBy(p => (p.Min - Camera3D.CameraPosition).Length()).ToList();
if(Value.Count > 0)
BoundingBoxRenderer.Render(Value[0], GraphicsDevice, Camera3D.ViewMatrix, Camera3D.ProjectionMatrix, Color.Red);

Liebe Grüße.

Lösung