public bool Raycast(Ray ray, ref RayTriangleHit closestRayTriangleHitInfo,
ref Triangle closestTriangle)
{
if (!_boundingBox.Raycast(ray, closestRayTriangleHitInfo.Distance)) return false;
bool hitFound = false;
var hitInfo = new RayTriangleHit();
foreach (Triangle triangle in _directTriangleChildren)
{
if (triangle.RayCast(ray, ref hitInfo) && (closestRayTriangleHitInfo.Distance > hitInfo.Distance))
{
closestRayTriangleHitInfo = hitInfo;
closestTriangle = triangle;
hitFound = true;
}
}
for (int i = 0; i < 8; i++)
{
if (_children[i] != null)
{
bool childHit = _children[i].Raycast(ray, ref closestRayTriangleHitInfo, ref closestTriangle);
hitFound |= childHit;
}
}
return hitFound;
}
/// <summary>
/// Casts a ray against mesh
/// </summary>
/// <param name="ray">Ray to be cast</param>
/// <param name="maxDistance">Maximum distance to trace ray</param>
/// <param name="hitInfo">Will contain hit information if true is returned</param>
/// <returns>Distance along the ray the hit was found</returns>
public bool Raycast(Ray ray, float maxDistance, ref RaycastHit hitInfo)
{
#if DEBUG
Interlocked.Increment(ref Counters.RaysCast);
#endif
var localRayDirection = ray.Direction.RotatedBy(_invRotation);
var localRayOrigin = (ray.Origin - Position).RotatedBy(_invRotation);
var localRay = new Ray(localRayOrigin, localRayDirection);
var hit = new RayTriangleHit {Distance = maxDistance};
Triangle closestTriangle = null;
bool hitFound = _octree.Raycast(localRay, ref hit, ref closestTriangle);
if (!hitFound) return false;
Vector3 normal = _normalSampler.Sample(closestTriangle, hit.U, hit.V).RotatedBy(_rotation);
hitInfo = new RaycastHit(hit, closestTriangle, this, ray, normal);
return true;
}
public bool RayCast(Ray ray, ref RayTriangleHit hitInfo)
{
#if DEBUG
Interlocked.Increment(ref Counters.RayTriangleTests);
#endif
if (Vector3.IsDotGreaterThanZero(Normal, ray.Direction))
{
#if DEBUG
Interlocked.Increment(ref Counters.BackfaceCulls);
#endif
return false;
}
Vector3 pVec = Vector3.Cross(ray.Direction, _edge2);
float determinant = Vector3.Dot(_edge1, pVec);
// ReSharper disable once CompareOfFloatsByEqualityOperator
float invDeterminant = 1 / determinant;
Vector3 tVec = ray.Origin - V1;
float u = Vector3.Dot(tVec, pVec) * invDeterminant;
if (u < 0 || u > 1) return false;
Vector3 qVec = Vector3.Cross(tVec, _edge1);
float v = Vector3.Dot(ray.Direction, qVec) * invDeterminant;
if (v < 0 || u + v > 1) return false;
float distance = Vector3.Dot(_edge2, qVec) * invDeterminant;
if (distance < 0) return false;
hitInfo.U = u;
hitInfo.V = v;
hitInfo.Distance = distance;
#if DEBUG
Interlocked.Increment(ref Counters.RayHits);
#endif
return true;
}
