BEPUphysics.UpdateableSystems.FluidVolume.GetSubmergedHeight C# (CSharp) Метод

        float GetSubmergedHeight(EntityCollidable collidable, float maxLength, float boundingBoxHeight, ref Vector3 rayOrigin, ref Vector3 xSpacing, ref Vector3 zSpacing, int i, int j, out Vector3 volumeCenter)
        {
            Ray ray;
            Vector3.Multiply(ref xSpacing, i, out ray.Position);
            Vector3.Multiply(ref zSpacing, j, out ray.Direction);
            Vector3.Add(ref ray.Position, ref ray.Direction, out ray.Position);
            Vector3.Add(ref ray.Position, ref rayOrigin, out ray.Position);

            ray.Direction = upVector;
            //do a bottom-up raycast.
            RayHit rayHit;
            //Only go up to maxLength.  If it's further away than maxLength, then it's above the water and it doesn't contribute anything.
            if (collidable.RayCast(ray, maxLength, out rayHit))
            {
                //Position the ray to point from the other side.
                Vector3.Multiply(ref ray.Direction, boundingBoxHeight, out ray.Direction);
                Vector3.Add(ref ray.Position, ref ray.Direction, out ray.Position);
                Vector3.Negate(ref upVector, out ray.Direction);

                //Transform the hit into local space.
                RigidTransform.TransformByInverse(ref rayHit.Location, ref surfaceTransform, out rayHit.Location);
                float bottomY = rayHit.Location.Y;
                float bottom = rayHit.T;
                Vector3 bottomPosition = rayHit.Location;
                if (collidable.RayCast(ray, boundingBoxHeight - rayHit.T, out rayHit))
                {
                    //Transform the hit into local space.
                    RigidTransform.TransformByInverse(ref rayHit.Location, ref surfaceTransform, out rayHit.Location);
                    Vector3.Add(ref rayHit.Location, ref bottomPosition, out volumeCenter);
                    Vector3.Multiply(ref volumeCenter, .5f, out volumeCenter);
                    return Math.Min(-bottomY, boundingBoxHeight - rayHit.T - bottom);
                }
                //This inner raycast should always hit, but just in case it doesn't due to some numerical problem, give it a graceful way out.
                volumeCenter = Vector3.Zero;
                return 0;
            }
            volumeCenter = Vector3.Zero;
            return 0;
        }