public bool Visit(ShapeNode node)
{
if (node.Enabled)
{
TestIntersects(node);
}
return(true);
}
public override IDAEShapeNode CreateShapeNode(string name, IDAEMaterial material, IDAEGeometry geometry)
{
var shape = new ShapeNode();
shape.Name = name;
shape.Material = material as Material;
shape.Geometry = geometry as IGeometry;
return(shape);
}
private bool TestIntersects(SceneNode node)
{
if (!(node is ShapeNode) && (node.BoundingBox == null || !node.BoundingBox.IsValid))
{
return(true);
}
Matrix4 trans = node.GetWorldTransform(_root).Value;
Vector3 max = (trans * new Vector4(node.BoundingBox.Max.Value, 1.0f)).DivW.XYZ;
Vector3 center = (trans * new Vector4(node.BoundingBox.Center.Value, 1.0f)).DivW.XYZ;
float radius = (center - max).Length;
// plane equation
float d = _pickRay.Direction.Dot(center);
// intersection point on plane
float s = (d - _pickRay.Direction.Dot(_pickRay.Origin)) / _pickRay.Direction.Dot(_pickRay.Direction);
if (s >= 0 || (_pickRay.Origin - center).Length < radius)
{
Vector3 f = _pickRay.Origin + (_pickRay.Direction * s);
float dist = (f - center).Length; // distance of ray from sphere center
if (dist < radius) // ray intersects bounding sphere
{
if (node is ShapeNode)
{
ShapeNode shapeNode = node as ShapeNode;
// transform pick ray to object space
Matrix4 invTrans = node.GetInverseWorldTransform(_root).Value;
PickRay localPickRay = new PickRay();
localPickRay.Origin = (invTrans * new Vector4(_pickRay.Origin, 1)).XYZ;
localPickRay.Direction = (invTrans * new Vector4(_pickRay.Direction, 0)).XYZ;
// pick triangles in geometry
Vector3?localPickPoint = shapeNode.Geometry.Pick(localPickRay);
if (localPickPoint != null)
{
Vector3 pickPoint = (trans * new Vector4(localPickPoint.Value, 1)).DivW.XYZ;
float zDist = (_pickRay.Origin - pickPoint).Length;
if (_closestNode == null || zDist < _closestZDist)
{
_closestZDist = zDist;
_closestNode = shapeNode;
_pickPoint = pickPoint;
}
}
}
return(true); // is in bounding sphere
}
}
return(false);
}
public void Add(ShapeNode node)
{
List <ShapeNode> shapeList;
if (MaterialGroups.ContainsKey(node.Material))
{
shapeList = MaterialGroups[node.Material];
}
else
{
shapeList = GetOrCreateShapeList();
MaterialGroups.Add(node.Material, shapeList);
}
shapeList.Add(node);
}
private PickingResult?Pick(SceneNode root, PickRay ray)
{
_pickRay = ray;
_root = root;
_closestNode = null;
_closestZDist = 0;
root.Accept(this);
if (_closestNode != null)
{
PickingResult result = new PickingResult();
result.PickedNode = _closestNode;
result.PickingPoint = _pickPoint;
return(result);
}
return(null);
}
public bool Visit(ShapeNode node)
{
node.Preload(_renderer);
return(true);
}
public bool Visit(ShapeNode node)
{
CheckNode(node);
return(_continue);
}