OPC_OBBCollider.cpp

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*
 *	OPCODE - Optimized Collision Detection
 *	Copyright (C) 2001 Pierre Terdiman
 *	Homepage: http://www.codercorner.com/Opcode.htm
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Contains code for an OBB collider.
 *	\file		OPC_OBBCollider.cpp
 *	\author		Pierre Terdiman
 *	\date		January, 1st, 2002
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Contains an OBB-vs-tree collider.
 *
 *	\class		OBBCollider
 *	\author		Pierre Terdiman
 *	\version	1.3
 *	\date		January, 1st, 2002
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Precompiled Header
#include "Stdafx.h"

using namespace Opcode;
using namespace IceMaths;

#include "OPC_BoxBoxOverlap.h"
#include "OPC_TriBoxOverlap.h"

#define SET_CONTACT(prim_index, flag)											\
	/* Set contact status */													\
	mFlags |= flag;																\
	mTouchedPrimitives->Add(prim_index);

//! OBB-triangle test
#define OBB_PRIM(prim_index, flag)												\
	/* Request vertices from the app */											\
	VertexPointers VP;	mIMesh->GetTriangle(VP, prim_index);					\
	/* Transform them in a common space with scales */										\
	TransformPoint(mLeafVerts[0], *VP.Vertex[0], mSRModelToBox, mTModelToBox);	\
	TransformPoint(mLeafVerts[1], *VP.Vertex[1], mSRModelToBox, mTModelToBox);	\
	TransformPoint(mLeafVerts[2], *VP.Vertex[2], mSRModelToBox, mTModelToBox);	\
	/* Perform triangle-box overlap test */										\
	if(TriBoxOverlap())															\
	{																			\
		SET_CONTACT(prim_index, flag)											\
	}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Constructor.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
OBBCollider::OBBCollider() : mFullBoxBoxTest(true)
{
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Destructor.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
OBBCollider::~OBBCollider()
{
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Validates current settings. You should call this method after all the settings and callbacks have been defined.
 *	\return		null if everything is ok, else a string describing the problem
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const char* OBBCollider::ValidateSettings()
{
	if(TemporalCoherenceEnabled() && !FirstContactEnabled())	return "Temporal coherence only works with ""First contact"" mode!";

	return VolumeCollider::ValidateSettings();
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Generic collision query for generic OPCODE models. After the call, access the results:
 *	- with GetContactStatus()
 *	- with GetNbTouchedPrimitives()
 *	- with GetTouchedPrimitives()
 *
 *	\param		cache		[in/out] a box cache
 *	\param		box			[in] collision OBB in local space
 *	\param		model		[in] Opcode model to collide with
 *	\param		worldb		[in] OBB's world matrix, or null
 *	\param		worldm		[in] model's world matrix, or null
 *	\return		true if success
 *	\warning	SCALE NOT SUPPORTED IN THE BOX WORLD MATRIX. The matrix must contain rotation & translation parts only.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
bool OBBCollider::Collide(OBBCache& cache, const IceMaths::OBB& box, const Model& model, const IceMaths::Matrix4x4* worldb, const IceMaths::Matrix4x4* worldm)
{
	// Checkings
	if(!Setup(&model))	return false;

	// Init collision query
	if(InitQuery(cache, box, worldb, worldm))	return true;

	if(!model.HasLeafNodes())
	{
		if(model.IsQuantized())
		{
			const AABBQuantizedNoLeafTree* Tree = (const AABBQuantizedNoLeafTree*)model.GetTree();

			// Setup dequantization coeffs
			mCenterCoeff	= Tree->mCenterCoeff;
			mExtentsCoeff	= Tree->mExtentsCoeff;

			// Perform collision query
			if(SkipPrimitiveTests())	_CollideNoPrimitiveTest(Tree->GetNodes());
			else						_Collide(Tree->GetNodes());
		}
		else
		{
			const AABBNoLeafTree* Tree = (const AABBNoLeafTree*)model.GetTree();

			// Perform collision query
			if(SkipPrimitiveTests())	_CollideNoPrimitiveTest(Tree->GetNodes());
			else						_Collide(Tree->GetNodes());
		}
	}
	else
	{
		if(model.IsQuantized())
		{
			const AABBQuantizedTree* Tree = (const AABBQuantizedTree*)model.GetTree();

			// Setup dequantization coeffs
			mCenterCoeff	= Tree->mCenterCoeff;
			mExtentsCoeff	= Tree->mExtentsCoeff;

			// Perform collision query
			if(SkipPrimitiveTests())	_CollideNoPrimitiveTest(Tree->GetNodes());
			else						_Collide(Tree->GetNodes());
		}
		else
		{
			const AABBCollisionTree* Tree = (const AABBCollisionTree*)model.GetTree();

			// Perform collision query
			if(SkipPrimitiveTests())	_CollideNoPrimitiveTest(Tree->GetNodes());
			else						_Collide(Tree->GetNodes());
		}
	}

	return true;
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Initializes a collision query :
 *	- reset stats & contact status
 *	- setup matrices
 *	- check temporal coherence
 *
 *	\param		cache		[in/out] a box cache
 *	\param		box			[in] obb in local space
 *	\param		worldb		[in] obb's world matrix, or null
 *	\param		worldm		[in] model's world matrix, or null
 *	\return		TRUE if we can return immediately
 *	\warning	SCALE NOT SUPPORTED IN OBB WORLD MATRIX. The matrix must contain rotation & translation parts only.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
BOOL OBBCollider::InitQuery(OBBCache& cache, const IceMaths::OBB& box, const IceMaths::Matrix4x4* worldb, const IceMaths::Matrix4x4* worldm)
{
	// 1) Call the base method
	VolumeCollider::InitQuery();

	// 2) Compute obb in world space
	mBoxExtents = box.mExtents;

	IceMaths::Matrix4x4 WorldB;

	if(worldb)
	{
		// normalizes world matrix and gets scale
		Point obbScale;
		Matrix4x4 normWorldB;
		NormalizePRSMatrix( normWorldB, obbScale, *worldb );

		WorldB = Matrix4x4( box.mRot * Matrix3x3(normWorldB) );

		// note that scale is pre-applied to center and extents
		WorldB.SetTrans((box.mCenter*obbScale) * normWorldB);
		mBoxExtents *= obbScale;
	}
	else
	{
		WorldB = box.mRot;
		WorldB.SetTrans(box.mCenter);
	}

	// Setup matrices
	IceMaths::Matrix4x4 InvWorldB;
	InvertPRMatrix(InvWorldB, WorldB);

	if(worldm)
	{
		// Matrix normalization & scaling stripping
		IceMaths::Matrix4x4 normWorldM;
		NormalizePRSMatrix( normWorldM, mLocalScale, *worldm );

		// uses the PR part of the world matrix
		IceMaths::Matrix4x4 InvWorldM;
		InvertPRMatrix(InvWorldM, normWorldM);

		IceMaths::Matrix4x4 WorldBtoM = WorldB * InvWorldM;
		IceMaths::Matrix4x4 WorldMtoB = normWorldM * InvWorldB;
		mSRModelToBox = *worldm * InvWorldB; // for scales

		mRModelToBox = WorldMtoB;		WorldMtoB.GetTrans(mTModelToBox);
		mRBoxToModel = WorldBtoM;		WorldBtoM.GetTrans(mTBoxToModel);
	}
	else
	{
		mLocalScale.Set(1.0,1.0,1.0);
		mSRModelToBox = mRModelToBox = InvWorldB;	InvWorldB.GetTrans(mTModelToBox);
		mRBoxToModel = WorldB;		WorldB.GetTrans(mTBoxToModel);
	}

	// 3) Setup destination pointer
	mTouchedPrimitives = &cache.TouchedPrimitives;

	// 4) Special case: 1-triangle meshes [Opcode 1.3]
	if(mCurrentModel && mCurrentModel->HasSingleNode())
	{
		if(!SkipPrimitiveTests())
		{
			// We simply perform the BV-Prim overlap test each time. We assume single triangle has index 0.
			mTouchedPrimitives->Reset();

			// Perform overlap test between the unique triangle and the box (and set contact status if needed)
			OBB_PRIM(udword(0), OPC_CONTACT)

			// Return immediately regardless of status
			return TRUE;
		}
	}

	// 5) Check temporal coherence:
	if(TemporalCoherenceEnabled())
	{
		// Here we use temporal coherence
		// => check results from previous frame before performing the collision query
		if(FirstContactEnabled())
		{
			// We're only interested in the first contact found => test the unique previously touched face
			if(mTouchedPrimitives->GetNbEntries())
			{
				// Get index of previously touched face = the first entry in the array
				udword PreviouslyTouchedFace = mTouchedPrimitives->GetEntry(0);

				// Then reset the array:
				// - if the overlap test below is successful, the index we'll get added back anyway
				// - if it isn't, then the array should be reset anyway for the normal query
				mTouchedPrimitives->Reset();

				// Perform overlap test between the cached triangle and the box (and set contact status if needed)
				OBB_PRIM(PreviouslyTouchedFace, OPC_TEMPORAL_CONTACT)

				// Return immediately if possible
				if(GetContactStatus())	return TRUE;
			}
			// else no face has been touched during previous query
			// => we'll have to perform a normal query
		}
		else
		{
			// ### rewrite this
			IceMaths::OBB TestBox(mTBoxToModel, mBoxExtents, mRBoxToModel);

			// We're interested in all contacts =>test the new real box N(ew) against the previous fat box P(revious):
			if(IsCacheValid(cache) && TestBox.IsInside(cache.FatBox))
			{
				// - if N is included in P, return previous list
				// => we simply leave the list (mTouchedFaces) unchanged

				// Set contact status if needed
				if(mTouchedPrimitives->GetNbEntries())	mFlags |= OPC_TEMPORAL_CONTACT;

				// In any case we don't need to do a query
				return TRUE;
			}
			else
			{
				// - else do the query using a fat N

				// Reset cache since we'll about to perform a real query
				mTouchedPrimitives->Reset();

				// Make a fat box so that coherence will work for subsequent frames
				TestBox.mExtents *= cache.FatCoeff;
				mBoxExtents *= cache.FatCoeff;

				// Update cache with query data (signature for cached faces)
				cache.FatBox = TestBox;
			}
		}
	}
	else
	{
		// Here we don't use temporal coherence => do a normal query
		mTouchedPrimitives->Reset();
	}

	// Now we can precompute box-box data

	// Precompute absolute box-to-model rotation matrix
	for(udword i=0;i<3;i++)
	{
		for(udword j=0;j<3;j++)
		{
			// Epsilon value prevents floating-point inaccuracies (strategy borrowed from RAPID)
			mAR.m[i][j] = 1e-6f + fabsf(mRBoxToModel.m[i][j]);
		}
	}

	// Precompute bounds for box-in-box test
	mB0 = mBoxExtents - mTModelToBox;
	mB1 = - mBoxExtents - mTModelToBox;

	// Precompute box-box data - Courtesy of Erwin de Vries
	mBBx1 = mBoxExtents.x*mAR.m[0][0] + mBoxExtents.y*mAR.m[1][0] + mBoxExtents.z*mAR.m[2][0];
	mBBy1 = mBoxExtents.x*mAR.m[0][1] + mBoxExtents.y*mAR.m[1][1] + mBoxExtents.z*mAR.m[2][1];
	mBBz1 = mBoxExtents.x*mAR.m[0][2] + mBoxExtents.y*mAR.m[1][2] + mBoxExtents.z*mAR.m[2][2];

	mBB_1 = mBoxExtents.y*mAR.m[2][0] + mBoxExtents.z*mAR.m[1][0];
	mBB_2 = mBoxExtents.x*mAR.m[2][0] + mBoxExtents.z*mAR.m[0][0];
	mBB_3 = mBoxExtents.x*mAR.m[1][0] + mBoxExtents.y*mAR.m[0][0];
	mBB_4 = mBoxExtents.y*mAR.m[2][1] + mBoxExtents.z*mAR.m[1][1];
	mBB_5 = mBoxExtents.x*mAR.m[2][1] + mBoxExtents.z*mAR.m[0][1];
	mBB_6 = mBoxExtents.x*mAR.m[1][1] + mBoxExtents.y*mAR.m[0][1];
	mBB_7 = mBoxExtents.y*mAR.m[2][2] + mBoxExtents.z*mAR.m[1][2];
	mBB_8 = mBoxExtents.x*mAR.m[2][2] + mBoxExtents.z*mAR.m[0][2];
	mBB_9 = mBoxExtents.x*mAR.m[1][2] + mBoxExtents.y*mAR.m[0][2];

	return FALSE;
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Checks the OBB completely contains the box. In which case we can end the query sooner.
 *	\param		bc	[in] box center
 *	\param		be	[in] box extents
 *	\return		true if the OBB contains the whole box
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
inline_ BOOL OBBCollider::OBBContainsBox(const IceMaths::Point& bc_, const IceMaths::Point& be_)
{
	// Applies the model's local scale
	const IceMaths::Point bc = bc_ * mLocalScale;
	const IceMaths::Point be = be_ * mLocalScale;

	// I assume if all 8 box vertices are inside the OBB, so does the whole box.
	// Sounds ok but maybe there's a better way?
/*
#define TEST_PT(a,b,c)																												\
	p.x=a;	p.y=b;	p.z=c;		p+=bc;																								\
	f = p.x * mRModelToBox.m[0][0] + p.y * mRModelToBox.m[1][0] + p.z * mRModelToBox.m[2][0];	if(f>mB0.x || f<mB1.x) return FALSE;\
	f = p.x * mRModelToBox.m[0][1] + p.y * mRModelToBox.m[1][1] + p.z * mRModelToBox.m[2][1];	if(f>mB0.y || f<mB1.y) return FALSE;\
	f = p.x * mRModelToBox.m[0][2] + p.y * mRModelToBox.m[1][2] + p.z * mRModelToBox.m[2][2];	if(f>mB0.z || f<mB1.z) return FALSE;

	Point p;
	float f;

	TEST_PT(be.x, be.y, be.z)
	TEST_PT(-be.x, be.y, be.z)
	TEST_PT(be.x, -be.y, be.z)
	TEST_PT(-be.x, -be.y, be.z)
	TEST_PT(be.x, be.y, -be.z)
	TEST_PT(-be.x, be.y, -be.z)
	TEST_PT(be.x, -be.y, -be.z)
	TEST_PT(-be.x, -be.y, -be.z)

	return TRUE;
*/

	// Yes there is:
	// - compute model-box's AABB in OBB space
	// - test AABB-in-AABB
	float NCx = bc.x * mRModelToBox.m[0][0] + bc.y * mRModelToBox.m[1][0] + bc.z * mRModelToBox.m[2][0];
	float NEx = fabsf(mRModelToBox.m[0][0] * be.x) + fabsf(mRModelToBox.m[1][0] * be.y) + fabsf(mRModelToBox.m[2][0] * be.z);

	if(mB0.x < NCx+NEx)	return FALSE;
	if(mB1.x > NCx-NEx)	return FALSE;

	float NCy = bc.x * mRModelToBox.m[0][1] + bc.y * mRModelToBox.m[1][1] + bc.z * mRModelToBox.m[2][1];
	float NEy = fabsf(mRModelToBox.m[0][1] * be.x) + fabsf(mRModelToBox.m[1][1] * be.y) + fabsf(mRModelToBox.m[2][1] * be.z);

	if(mB0.y < NCy+NEy)	return FALSE;
	if(mB1.y > NCy-NEy)	return FALSE;

	float NCz = bc.x * mRModelToBox.m[0][2] + bc.y * mRModelToBox.m[1][2] + bc.z * mRModelToBox.m[2][2];
	float NEz = fabsf(mRModelToBox.m[0][2] * be.x) + fabsf(mRModelToBox.m[1][2] * be.y) + fabsf(mRModelToBox.m[2][2] * be.z);

	if(mB0.z < NCz+NEz)	return FALSE;
	if(mB1.z > NCz-NEz)	return FALSE;

	return TRUE;
}

#define TEST_BOX_IN_OBB(center, extents)	\
	if(OBBContainsBox(center, extents))		\
	{										\
		/* Set contact status */			\
		mFlags |= OPC_CONTACT;				\
		_Dump(node);						\
		return;								\
	}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for normal AABB trees.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_Collide(const AABBCollisionNode* node)
{
	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(node->mAABB.mExtents, node->mAABB.mCenter))	return;

	TEST_BOX_IN_OBB(node->mAABB.mCenter, node->mAABB.mExtents)

	if(node->IsLeaf())
	{
		OBB_PRIM(node->GetPrimitive(), OPC_CONTACT)
	}
	else
	{
		_Collide(node->GetPos());

		if(ContactFound()) return;

		_Collide(node->GetNeg());
	}
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for normal AABB trees, without primitive tests.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_CollideNoPrimitiveTest(const AABBCollisionNode* node)
{
	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(node->mAABB.mExtents, node->mAABB.mCenter))	return;

	TEST_BOX_IN_OBB(node->mAABB.mCenter, node->mAABB.mExtents)

	if(node->IsLeaf())
	{
		SET_CONTACT(node->GetPrimitive(), OPC_CONTACT)
	}
	else
	{
		_CollideNoPrimitiveTest(node->GetPos());

		if(ContactFound()) return;

		_CollideNoPrimitiveTest(node->GetNeg());
	}
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for quantized AABB trees.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_Collide(const AABBQuantizedNode* node)
{
	// Dequantize box
	const QuantizedAABB& Box = node->mAABB;
	const IceMaths::Point Center(float(Box.mCenter[0]) * mCenterCoeff.x, float(Box.mCenter[1]) * mCenterCoeff.y, float(Box.mCenter[2]) * mCenterCoeff.z);
	const IceMaths::Point Extents(float(Box.mExtents[0]) * mExtentsCoeff.x, float(Box.mExtents[1]) * mExtentsCoeff.y, float(Box.mExtents[2]) * mExtentsCoeff.z);

	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(Extents, Center))	return;

	TEST_BOX_IN_OBB(Center, Extents)

	if(node->IsLeaf())
	{
		OBB_PRIM(node->GetPrimitive(), OPC_CONTACT)
	}
	else
	{
		_Collide(node->GetPos());

		if(ContactFound()) return;

		_Collide(node->GetNeg());
	}
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for quantized AABB trees, without primitive tests.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_CollideNoPrimitiveTest(const AABBQuantizedNode* node)
{
	// Dequantize box
	const QuantizedAABB& Box = node->mAABB;
	const IceMaths::Point Center(float(Box.mCenter[0]) * mCenterCoeff.x, float(Box.mCenter[1]) * mCenterCoeff.y, float(Box.mCenter[2]) * mCenterCoeff.z);
	const IceMaths::Point Extents(float(Box.mExtents[0]) * mExtentsCoeff.x, float(Box.mExtents[1]) * mExtentsCoeff.y, float(Box.mExtents[2]) * mExtentsCoeff.z);

	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(Extents, Center))	return;

	TEST_BOX_IN_OBB(Center, Extents)

	if(node->IsLeaf())
	{
		SET_CONTACT(node->GetPrimitive(), OPC_CONTACT)
	}
	else
	{
		_CollideNoPrimitiveTest(node->GetPos());

		if(ContactFound()) return;

		_CollideNoPrimitiveTest(node->GetNeg());
	}
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for no-leaf AABB trees.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_Collide(const AABBNoLeafNode* node)
{
	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(node->mAABB.mExtents, node->mAABB.mCenter))	return;

	TEST_BOX_IN_OBB(node->mAABB.mCenter, node->mAABB.mExtents)

	if(node->HasPosLeaf())	{ OBB_PRIM(node->GetPosPrimitive(), OPC_CONTACT) }
	else					_Collide(node->GetPos());

	if(ContactFound()) return;

	if(node->HasNegLeaf())	{ OBB_PRIM(node->GetNegPrimitive(), OPC_CONTACT) }
	else					_Collide(node->GetNeg());
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for no-leaf AABB trees, without primitive tests.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_CollideNoPrimitiveTest(const AABBNoLeafNode* node)
{
	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(node->mAABB.mExtents, node->mAABB.mCenter))	return;

	TEST_BOX_IN_OBB(node->mAABB.mCenter, node->mAABB.mExtents)

	if(node->HasPosLeaf())	{ SET_CONTACT(node->GetPosPrimitive(), OPC_CONTACT) }
	else					_CollideNoPrimitiveTest(node->GetPos());

	if(ContactFound()) return;

	if(node->HasNegLeaf())	{ SET_CONTACT(node->GetNegPrimitive(), OPC_CONTACT) }
	else					_CollideNoPrimitiveTest(node->GetNeg());
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for quantized no-leaf AABB trees.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_Collide(const AABBQuantizedNoLeafNode* node)
{
	// Dequantize box
	const QuantizedAABB& Box = node->mAABB;
	const IceMaths::Point Center(float(Box.mCenter[0]) * mCenterCoeff.x, float(Box.mCenter[1]) * mCenterCoeff.y, float(Box.mCenter[2]) * mCenterCoeff.z);
	const IceMaths::Point Extents(float(Box.mExtents[0]) * mExtentsCoeff.x, float(Box.mExtents[1]) * mExtentsCoeff.y, float(Box.mExtents[2]) * mExtentsCoeff.z);

	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(Extents, Center))	return;

	TEST_BOX_IN_OBB(Center, Extents)

	if(node->HasPosLeaf())	{ OBB_PRIM(node->GetPosPrimitive(), OPC_CONTACT) }
	else					_Collide(node->GetPos());

	if(ContactFound()) return;

	if(node->HasNegLeaf())	{ OBB_PRIM(node->GetNegPrimitive(), OPC_CONTACT) }
	else					_Collide(node->GetNeg());
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Recursive collision query for quantized no-leaf AABB trees, without primitive tests.
 *	\param		node	[in] current collision node
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void OBBCollider::_CollideNoPrimitiveTest(const AABBQuantizedNoLeafNode* node)
{
	// Dequantize box
	const QuantizedAABB& Box = node->mAABB;
	const IceMaths::Point Center(float(Box.mCenter[0]) * mCenterCoeff.x, float(Box.mCenter[1]) * mCenterCoeff.y, float(Box.mCenter[2]) * mCenterCoeff.z);
	const IceMaths::Point Extents(float(Box.mExtents[0]) * mExtentsCoeff.x, float(Box.mExtents[1]) * mExtentsCoeff.y, float(Box.mExtents[2]) * mExtentsCoeff.z);

	// Perform OBB-AABB overlap test
	if(!BoxBoxOverlap(Extents, Center))	return;

	TEST_BOX_IN_OBB(Center, Extents)

	if(node->HasPosLeaf())	{ SET_CONTACT(node->GetPosPrimitive(), OPC_CONTACT) }
	else					_CollideNoPrimitiveTest(node->GetPos());

	if(ContactFound()) return;

	if(node->HasNegLeaf())	{ SET_CONTACT(node->GetNegPrimitive(), OPC_CONTACT) }
	else					_CollideNoPrimitiveTest(node->GetNeg());
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Constructor.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
HybridOBBCollider::HybridOBBCollider()
{
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Destructor.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
HybridOBBCollider::~HybridOBBCollider()
{
}

bool HybridOBBCollider::Collide(OBBCache& cache, const IceMaths::OBB& box, const HybridModel& model, const IceMaths::Matrix4x4* worldb, const IceMaths::Matrix4x4* worldm)
{
	// We don't want primitive tests here!
	mFlags |= OPC_NO_PRIMITIVE_TESTS;

	// Checkings
	if(!Setup(&model))	return false;

	// Init collision query
	if(InitQuery(cache, box, worldb, worldm))	return true;

	// Special case for 1-leaf trees
	if(mCurrentModel && mCurrentModel->HasSingleNode())
	{
		// Here we're supposed to perform a normal query, except our tree has a single node, i.e. just a few triangles
		udword Nb = mIMesh->GetNbTriangles();

		// Loop through all triangles
		for(udword i=0;i<Nb;i++)
		{
			OBB_PRIM(i, OPC_CONTACT)
		}
		return true;
	}

	// Override destination array since we're only going to get leaf boxes here
	mTouchedBoxes.Reset();
	mTouchedPrimitives = &mTouchedBoxes;

	// Now, do the actual query against leaf boxes
	if(!model.HasLeafNodes())
	{
		if(model.IsQuantized())
		{
			const AABBQuantizedNoLeafTree* Tree = (const AABBQuantizedNoLeafTree*)model.GetTree();

			// Setup dequantization coeffs
			mCenterCoeff	= Tree->mCenterCoeff;
			mExtentsCoeff	= Tree->mExtentsCoeff;

			// Perform collision query - we don't want primitive tests here!
			_CollideNoPrimitiveTest(Tree->GetNodes());
		}
		else
		{
			const AABBNoLeafTree* Tree = (const AABBNoLeafTree*)model.GetTree();

			// Perform collision query - we don't want primitive tests here!
			_CollideNoPrimitiveTest(Tree->GetNodes());
		}
	}
	else
	{
		if(model.IsQuantized())
		{
			const AABBQuantizedTree* Tree = (const AABBQuantizedTree*)model.GetTree();

			// Setup dequantization coeffs
			mCenterCoeff	= Tree->mCenterCoeff;
			mExtentsCoeff	= Tree->mExtentsCoeff;

			// Perform collision query - we don't want primitive tests here!
			_CollideNoPrimitiveTest(Tree->GetNodes());
		}
		else
		{
			const AABBCollisionTree* Tree = (const AABBCollisionTree*)model.GetTree();

			// Perform collision query - we don't want primitive tests here!
			_CollideNoPrimitiveTest(Tree->GetNodes());
		}
	}

	// We only have a list of boxes so far
	if(GetContactStatus())
	{
		// Reset contact status, since it currently only reflects collisions with leaf boxes
		Collider::InitQuery();

		// Change dest container so that we can use built-in overlap tests and get collided primitives
		cache.TouchedPrimitives.Reset();
		mTouchedPrimitives = &cache.TouchedPrimitives;

		// Read touched leaf boxes
		udword Nb = mTouchedBoxes.GetNbEntries();
		const udword* Touched = mTouchedBoxes.GetEntries();

		const LeafTriangles* LT = model.GetLeafTriangles();
		const udword* Indices = model.GetIndices();

		// Loop through touched leaves
		while(Nb--)
		{
			const LeafTriangles& CurrentLeaf = LT[*Touched++];

			// Each leaf box has a set of triangles
			udword NbTris = CurrentLeaf.GetNbTriangles();
			if(Indices)
			{
				const udword* T = &Indices[CurrentLeaf.GetTriangleIndex()];

				// Loop through triangles and test each of them
				while(NbTris--)
				{
					udword TriangleIndex = *T++;
					OBB_PRIM(TriangleIndex, OPC_CONTACT)
				}
			}
			else
			{
				udword BaseIndex = CurrentLeaf.GetTriangleIndex();

				// Loop through triangles and test each of them
				while(NbTris--)
				{
					udword TriangleIndex = BaseIndex++;
					OBB_PRIM(TriangleIndex, OPC_CONTACT)
				}
			}
		}
	}

	return true;
}