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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "Wm5GraphicsPCH.h"
#include "Wm5BillboardNode.h"
using namespace Wm5;
WM5_IMPLEMENT_RTTI(Wm5, Node, BillboardNode);
WM5_IMPLEMENT_STREAM(BillboardNode);
WM5_IMPLEMENT_FACTORY(BillboardNode);
//----------------------------------------------------------------------------
BillboardNode::BillboardNode (Camera* camera)
:
mCamera(camera)
{
}
//----------------------------------------------------------------------------
BillboardNode::~BillboardNode ()
{
}
//----------------------------------------------------------------------------
void BillboardNode::UpdateWorldData (double applicationTime)
{
// Compute the billboard's world transforms based on its parent's world
// transform and its local transforms. Notice that you should not call
// Node::UpdateWorldData since that function updates its children. The
// children of a BillboardNode cannot be updated until the billboard is
// aligned with the camera.
Spatial::UpdateWorldData(applicationTime);
if (mCamera)
{
// Inverse-transform the camera to the model space of the billboard.
APoint modelPos = WorldTransform.Inverse()*mCamera->GetPosition();
// To align the billboard, the projection of the camera to the
// xz-plane of the billboard's model space determines the angle of
// rotation about the billboard's model y-axis. If the projected
// camera is on the model axis (x = 0 and z = 0), ATan2 returns zero
// (rather than NaN), so there is no need to trap this degenerate
// case and handle it separately.
float angle = Mathf::ATan2(modelPos[0], modelPos[2]);
HMatrix orient(AVector::UNIT_Y, angle);
WorldTransform.SetRotate(WorldTransform.GetRotate()*orient);
}
// Update the children now that the billboard orientation is known.
std::vector<SpatialPtr>::iterator iter = mChild.begin();
std::vector<SpatialPtr>::iterator end = mChild.end();
for (/**/; iter != end; ++iter)
{
Spatial* child = *iter;
if (child)
{
child->Update(applicationTime, false);
}
}
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Name support.
//----------------------------------------------------------------------------
Object* BillboardNode::GetObjectByName (const std::string& name)
{
Object* found = Object::GetObjectByName(name);
if (found)
{
return found;
}
WM5_GET_OBJECT_BY_NAME(mCamera, name, found);
return 0;
}
//----------------------------------------------------------------------------
void BillboardNode::GetAllObjectsByName (const std::string& name,
std::vector<Object*>& objects)
{
Node::GetAllObjectsByName(name, objects);
WM5_GET_ALL_OBJECTS_BY_NAME(mCamera, name, objects);
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Streaming support.
//----------------------------------------------------------------------------
BillboardNode::BillboardNode (LoadConstructor value)
:
Node(value),
mCamera(0)
{
}
//----------------------------------------------------------------------------
void BillboardNode::Load (InStream& source)
{
WM5_BEGIN_DEBUG_STREAM_LOAD(source);
Node::Load(source);
source.ReadPointer(mCamera);
WM5_END_DEBUG_STREAM_LOAD(BillboardNode, source);
}
//----------------------------------------------------------------------------
void BillboardNode::Link (InStream& source)
{
Node::Link(source);
source.ResolveLink(mCamera);
}
//----------------------------------------------------------------------------
void BillboardNode::PostLink ()
{
Node::PostLink();
}
//----------------------------------------------------------------------------
bool BillboardNode::Register (OutStream& target) const
{
if (Node::Register(target))
{
target.Register(mCamera);
return true;
}
return false;
}
//----------------------------------------------------------------------------
void BillboardNode::Save (OutStream& target) const
{
WM5_BEGIN_DEBUG_STREAM_SAVE(target);
Node::Save(target);
target.WritePointer(mCamera);
WM5_END_DEBUG_STREAM_SAVE(BillboardNode, target);
}
//----------------------------------------------------------------------------
int BillboardNode::GetStreamingSize () const
{
int size = Node::GetStreamingSize();
size += WM5_POINTERSIZE(mCamera);
return size;
}
//----------------------------------------------------------------------------
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