public DxMeshEntity Intersect(
Vector3 rayPos,
Vector3 rayDir)
{
double mindist = double.MaxValue;
AdnPoint point = null;
DxMeshEntity closestEntity = null;
AdnRay ray = new AdnRay(
new AdnPoint(
rayPos.X - _center.X,
rayPos.Y - _center.Y,
rayPos.Z - _center.Z),
new AdnVector(
rayDir.X,
rayDir.Y,
rayDir.Z));
foreach (var entity in _meshEntities.Values)
{
if (entity.Intersects(ray, ref point))
{
double dist = ray.Origin.SquaredDistanceTo(point);
if (dist < mindist)
{
mindist = dist;
closestEntity = entity;
}
}
}
return closestEntity;
}
public bool Intersects(
AdnRay ray,
ref AdnPoint point)
{
point = null;
// Perform intersection test on bounding box
// first for performances
if (!_boundingBox.Intersects(ray))
return false;
double mindist = double.PositiveInfinity;
for (int idx = 0; idx < _vertexBuffer.ElementCount; idx += 3)
{
AdnPoint p = null;
if (ray.Intersect(
_vertices[idx],
_vertices[idx + 1],
_vertices[idx + 2],
out p))
{
double dist = ray.Origin.SquaredDistanceTo(p);
if (dist < mindist)
{
mindist = dist;
point = p;
}
}
}
return (point != null);
}
public bool Intersects(AdnRay ray)
{
if (ray.Intersect(_vertices[0], _vertices[1], _vertices[2]))
return true;
if (ray.Intersect(_vertices[2], _vertices[3], _vertices[0]))
return true;
if (ray.Intersect(_vertices[1], _vertices[5], _vertices[4]))
return true;
if (ray.Intersect(_vertices[4], _vertices[2], _vertices[1]))
return true;
if (ray.Intersect(_vertices[3], _vertices[2], _vertices[4]))
return true;
if (ray.Intersect(_vertices[4], _vertices[7], _vertices[3]))
return true;
if (ray.Intersect(_vertices[0], _vertices[7], _vertices[7]))
return true;
if (ray.Intersect(_vertices[7], _vertices[0], _vertices[6]))
return true;
if (ray.Intersect(_vertices[0], _vertices[1], _vertices[6]))
return true;
if (ray.Intersect(_vertices[1], _vertices[5], _vertices[6]))
return true;
if (ray.Intersect(_vertices[4], _vertices[7], _vertices[6]))
return true;
if (ray.Intersect(_vertices[6], _vertices[5], _vertices[4]))
return true;
return false;
}
