public static Vector3 CalculateSitOnSurfaceOffset(OBB obb, Plane surfacePlane, float offsetFromSurface)
{
List <Vector3> obbCorners = obb.GetCornerPoints();
int pivotPointIndex = surfacePlane.GetFurthestPtBehind(obbCorners);
if (pivotPointIndex < 0)
{
pivotPointIndex = surfacePlane.GetClosestPtInFrontOrOnPlane(obbCorners);
}
if (pivotPointIndex >= 0)
{
Vector3 pivotPt = obbCorners[pivotPointIndex];
Vector3 prjPt = surfacePlane.ProjectPoint(pivotPt);
return((prjPt - pivotPt) + surfacePlane.normal * offsetFromSurface);
}
return(Vector3.zero);
}
public bool OverlapBox(OBB obb, List <GameObject> gameObjects)
{
if (Settings.PhysicsMode == ScenePhysicsMode.UnityColliders)
{
gameObjects.Clear();
// Retrieve the overlapped 3D objects and store them inside the output list
Collider[] overlapped3DColliders = Physics.OverlapBox(obb.Center, obb.Extents, obb.Rotation);
foreach (var collider in overlapped3DColliders)
{
gameObjects.Add(collider.gameObject);
}
// Retrieve the overlapped 2D objects. This requires some further calculations
// because colliders of 2D sprites exist in the XY plane, so we must project the
// OBB onto the XY plane, and use the min and max projected points to build an
// overlap area.
Plane xyPlane = new Plane(Vector3.forward, 0.0f);
List <Vector3> projectedCorners = xyPlane.ProjectAllPoints(obb.GetCornerPoints());
AABB projectedPtsAABB = new AABB(projectedCorners);
// The OBB has been projected onto the sprite XY plane. We can now use the AABB's min and max
// extents to construct the overlap area and use the 'OverlapAreaAll' function to retrieve the
// overlapped 2D colliders.
Collider2D[] overlapped2DColliders = Physics2D.OverlapAreaAll(projectedPtsAABB.Min, projectedPtsAABB.Max);
foreach (var collider in overlapped2DColliders)
{
gameObjects.Add(collider.gameObject);
}
return(gameObjects.Count != 0);
}
else
{
return(_sceneTree.OverlapBox(obb, gameObjects));
}
}
/// <summary>
/// Renders a wire box with lines meeting at corners.
/// </summary>
/// <param name="wireCornerLinePercentage">
/// Can have values in the [0, 1] interval and it controls the length of the
/// corner lines. A value of 0 draws lines of length 0 and a value of 1
/// draws lines of length equal to half the box length along a certain axis.
/// </param>
public static void DrawWireCornerBox(OBB box, float wireCornerLinePercentage)
{
// Store these for easy access
Mesh wireCornerLineMesh = MeshPool.Get.UnitCoordSystem;
List <Vector3> boxCorners = box.GetCornerPoints();
// Clamp percentage
wireCornerLinePercentage = Mathf.Clamp(wireCornerLinePercentage, 0.0f, 1.0f);
// Front bottom left point
Vector3 originalScale = box.Extents * wireCornerLinePercentage;
Vector3 scale = originalScale;
Vector3 position = boxCorners[(int)BoxCorner.FrontBottomLeft];
Matrix4x4 transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
// Front bottom right point
position = boxCorners[(int)BoxCorner.FrontBottomRight];
scale.x *= -1.0f;
transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
// Front top right point
position = boxCorners[(int)BoxCorner.FrontTopRight];
scale.y *= -1.0f;
transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
// Front top left point
position = boxCorners[(int)BoxCorner.FrontTopLeft];
scale = originalScale;
scale.y *= -1.0f;
transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
// Back bottom left point
position = boxCorners[(int)BoxCorner.BackBottomLeft];
scale.y = originalScale.y;
scale.x *= -1.0f;
scale.z *= -1.0f;
transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
// Back bottom right point
position = boxCorners[(int)BoxCorner.BackBottomRight];
scale.x = originalScale.x;
transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
// Back top right point
position = boxCorners[(int)BoxCorner.BackTopRight];
scale.y *= -1.0f;
transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
// Back top left point
position = boxCorners[(int)BoxCorner.BackTopLeft];
scale.x *= -1.0f;
transformMatrix = Matrix4x4.TRS(position, box.Rotation, scale);
Graphics.DrawMeshNow(wireCornerLineMesh, transformMatrix);
}
