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/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------

Copyright (c) 2006-2010, ASSIMP Development Team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
with or without modification, are permitted provided that the following 
conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the ASSIMP team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/

/** @file Implementation of the 3ds importer class */

#include "AssimpPCH.h"
#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER

// internal headers
#include "3DSLoader.h"
#include "TargetAnimation.h"

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Setup final material indices, generae a default material if necessary
void Discreet3DSImporter::ReplaceDefaultMaterial()
{
	
	// Try to find an existing material that matches the
	// typical default material setting:
	// - no textures
	// - diffuse color (in grey!)
	// NOTE: This is here to workaround the fact that some
	// exporters are writing a default material, too.
	unsigned int idx = 0xcdcdcdcd;
	for (unsigned int i = 0; i < mScene->mMaterials.size();++i)
	{
		std::string s = mScene->mMaterials[i].mName;
		for (std::string::iterator it = s.begin(); it != s.end(); ++it)
			*it = ::tolower(*it);

		if (std::string::npos == s.find("default"))continue;

		if (mScene->mMaterials[i].mDiffuse.r !=
			mScene->mMaterials[i].mDiffuse.g ||
			mScene->mMaterials[i].mDiffuse.r !=
			mScene->mMaterials[i].mDiffuse.b)continue;

		if (mScene->mMaterials[i].sTexDiffuse.mMapName.length()   != 0	||
			mScene->mMaterials[i].sTexBump.mMapName.length()      != 0	|| 
			mScene->mMaterials[i].sTexOpacity.mMapName.length()   != 0	||
			mScene->mMaterials[i].sTexEmissive.mMapName.length()  != 0	||
			mScene->mMaterials[i].sTexSpecular.mMapName.length()  != 0	||
			mScene->mMaterials[i].sTexShininess.mMapName.length() != 0 )
		{
			continue;
		}
		idx = i;
	}
	if (0xcdcdcdcd == idx)idx = (unsigned int)mScene->mMaterials.size();

	// now iterate through all meshes and through all faces and
	// find all faces that are using the default material
	unsigned int cnt = 0;
	for (std::vector<D3DS::Mesh>::iterator
		i =  mScene->mMeshes.begin();
		i != mScene->mMeshes.end();++i)
	{
		for (std::vector<unsigned int>::iterator
			a =  (*i).mFaceMaterials.begin();
			a != (*i).mFaceMaterials.end();++a)
		{
			// NOTE: The additional check seems to be necessary,
			// some exporters seem to generate invalid data here
			if (0xcdcdcdcd == (*a))
			{
				(*a) = idx;
				++cnt;
			}
			else if ( (*a) >= mScene->mMaterials.size())
			{
				(*a) = idx;
				DefaultLogger::get()->warn("Material index overflow in 3DS file. Using default material");
				++cnt;
			}
		}
	}
	if (cnt && idx == mScene->mMaterials.size())
	{
		// We need to create our own default material
		D3DS::Material sMat;
		sMat.mDiffuse = aiColor3D(0.3f,0.3f,0.3f);
		sMat.mName = "%%%DEFAULT";
		mScene->mMaterials.push_back(sMat);

		DefaultLogger::get()->info("3DS: Generating default material");
	}
}

// ------------------------------------------------------------------------------------------------
// Check whether all indices are valid. Otherwise we'd crash before the validation step is reached
void Discreet3DSImporter::CheckIndices(D3DS::Mesh& sMesh)
{
	for (std::vector< D3DS::Face >::iterator i =  sMesh.mFaces.begin(); i != sMesh.mFaces.end();++i)
	{
		// check whether all indices are in range
		for (unsigned int a = 0; a < 3;++a)
		{
			if ((*i).mIndices[a] >= sMesh.mPositions.size())
			{
				DefaultLogger::get()->warn("3DS: Vertex index overflow)");
				(*i).mIndices[a] = (uint32_t)sMesh.mPositions.size()-1;
			}
			if ( !sMesh.mTexCoords.empty() && (*i).mIndices[a] >= sMesh.mTexCoords.size())
			{
				DefaultLogger::get()->warn("3DS: Texture coordinate index overflow)");
				(*i).mIndices[a] = (uint32_t)sMesh.mTexCoords.size()-1;
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Generate out unique verbose format representation
void Discreet3DSImporter::MakeUnique(D3DS::Mesh& sMesh)
{
	// TODO: really necessary? I don't think. Just a waste of memory and time
	// to do it now in a separate buffer. 

	// Allocate output storage
	std::vector<aiVector3D> vNew  (sMesh.mFaces.size() * 3);
	std::vector<aiVector3D> vNew2;
	if (sMesh.mTexCoords.size())
		vNew2.resize(sMesh.mFaces.size() * 3);

	for (unsigned int i = 0, base = 0; i < sMesh.mFaces.size();++i)
	{
		D3DS::Face& face = sMesh.mFaces[i];

		// Positions
		for (unsigned int a = 0; a < 3;++a,++base)
		{
			vNew[base] = sMesh.mPositions[face.mIndices[a]];
			if (sMesh.mTexCoords.size())
				vNew2[base] = sMesh.mTexCoords[face.mIndices[a]];

			face.mIndices[a] = base;
		}
	}
	sMesh.mPositions = vNew;
	sMesh.mTexCoords = vNew2;
}

// ------------------------------------------------------------------------------------------------
// Convert a 3DS texture to texture keys in an aiMaterial
void CopyTexture(MaterialHelper& mat, D3DS::Texture& texture, aiTextureType type)
{
	// Setup the texture name
	aiString tex;
	tex.Set( texture.mMapName);
	mat.AddProperty( &tex, AI_MATKEY_TEXTURE(type,0));

	// Setup the texture blend factor
	if (is_not_qnan(texture.mTextureBlend))
		mat.AddProperty<float>( &texture.mTextureBlend, 1, AI_MATKEY_TEXBLEND(type,0));

	// Setup the texture mapping mode
	mat.AddProperty<int>((int*)&texture.mMapMode,1,AI_MATKEY_MAPPINGMODE_U(type,0));
	mat.AddProperty<int>((int*)&texture.mMapMode,1,AI_MATKEY_MAPPINGMODE_V(type,0));

	// Mirroring - double the scaling values 
	// FIXME: this is not really correct ...
	if (texture.mMapMode == aiTextureMapMode_Mirror)
	{
		texture.mScaleU *= 2.f;
		texture.mScaleV *= 2.f;
		texture.mOffsetU /= 2.f;
		texture.mOffsetV /= 2.f;
	}
	
	// Setup texture UV transformations
	mat.AddProperty<float>(&texture.mOffsetU,5,AI_MATKEY_UVTRANSFORM(type,0));
}

// ------------------------------------------------------------------------------------------------
// Convert a 3DS material to an aiMaterial
void Discreet3DSImporter::ConvertMaterial(D3DS::Material& oldMat,
	MaterialHelper& mat)
{
	// NOTE: Pass the background image to the viewer by bypassing the
	// material system. This is an evil hack, never do it again!
	if (0 != mBackgroundImage.length() && bHasBG)
	{
		aiString tex;
		tex.Set( mBackgroundImage);
		mat.AddProperty( &tex, AI_MATKEY_GLOBAL_BACKGROUND_IMAGE);

		// Be sure this is only done for the first material
		mBackgroundImage = std::string("");
	}

	// At first add the base ambient color of the scene to the material
	oldMat.mAmbient.r += mClrAmbient.r;
	oldMat.mAmbient.g += mClrAmbient.g;
	oldMat.mAmbient.b += mClrAmbient.b;

	aiString name;
	name.Set( oldMat.mName);
	mat.AddProperty( &name, AI_MATKEY_NAME);

	// Material colors
	mat.AddProperty( &oldMat.mAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
	mat.AddProperty( &oldMat.mDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
	mat.AddProperty( &oldMat.mSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
	mat.AddProperty( &oldMat.mEmissive, 1, AI_MATKEY_COLOR_EMISSIVE);

	// Phong shininess and shininess strength
	if (D3DS::Discreet3DS::Phong == oldMat.mShading || 
		D3DS::Discreet3DS::Metal == oldMat.mShading)
	{
		if (!oldMat.mSpecularExponent || !oldMat.mShininessStrength)
		{
			oldMat.mShading = D3DS::Discreet3DS::Gouraud;
		}
		else
		{
			mat.AddProperty( &oldMat.mSpecularExponent, 1, AI_MATKEY_SHININESS);
			mat.AddProperty( &oldMat.mShininessStrength, 1, AI_MATKEY_SHININESS_STRENGTH);
		}
	}

	// Opacity
	mat.AddProperty<float>( &oldMat.mTransparency,1,AI_MATKEY_OPACITY);

	// Bump height scaling
	mat.AddProperty<float>( &oldMat.mBumpHeight,1,AI_MATKEY_BUMPSCALING);

	// Two sided rendering?
	if (oldMat.mTwoSided)
	{
		int i = 1;
		mat.AddProperty<int>(&i,1,AI_MATKEY_TWOSIDED);
	}

	// Shading mode
	aiShadingMode eShading = aiShadingMode_NoShading;
	switch (oldMat.mShading)
	{
		case D3DS::Discreet3DS::Flat:
			eShading = aiShadingMode_Flat; break;

		// I don't know what "Wire" shading should be,
		// assume it is simple lambertian diffuse shading
		case D3DS::Discreet3DS::Wire:
			{
				// Set the wireframe flag
				unsigned int iWire = 1;
				mat.AddProperty<int>( (int*)&iWire,1,AI_MATKEY_ENABLE_WIREFRAME);
			}

		case D3DS::Discreet3DS::Gouraud:
			eShading = aiShadingMode_Gouraud; break;

		// assume cook-torrance shading for metals.
		case D3DS::Discreet3DS::Phong :
			eShading = aiShadingMode_Phong; break;

		case D3DS::Discreet3DS::Metal :
			eShading = aiShadingMode_CookTorrance; break;

			// FIX to workaround a warning with GCC 4 who complained
			// about a missing case Blinn: here - Blinn isn't a valid
			// value in the 3DS Loader, it is just needed for ASE
		case D3DS::Discreet3DS::Blinn :
			eShading = aiShadingMode_Blinn; break;
	}
	mat.AddProperty<int>( (int*)&eShading,1,AI_MATKEY_SHADING_MODEL);

	// DIFFUSE texture
	if( oldMat.sTexDiffuse.mMapName.length() > 0)
		CopyTexture(mat,oldMat.sTexDiffuse, aiTextureType_DIFFUSE);

	// SPECULAR texture
	if( oldMat.sTexSpecular.mMapName.length() > 0)
		CopyTexture(mat,oldMat.sTexSpecular, aiTextureType_SPECULAR);

	// OPACITY texture
	if( oldMat.sTexOpacity.mMapName.length() > 0)
		CopyTexture(mat,oldMat.sTexOpacity, aiTextureType_OPACITY);

	// EMISSIVE texture
	if( oldMat.sTexEmissive.mMapName.length() > 0)
		CopyTexture(mat,oldMat.sTexEmissive, aiTextureType_EMISSIVE);

	// BUMP texture
	if( oldMat.sTexBump.mMapName.length() > 0)
		CopyTexture(mat,oldMat.sTexBump, aiTextureType_HEIGHT);

	// SHININESS texture
	if( oldMat.sTexShininess.mMapName.length() > 0)
		CopyTexture(mat,oldMat.sTexShininess, aiTextureType_SHININESS);

	// REFLECTION texture
	if( oldMat.sTexReflective.mMapName.length() > 0)
		CopyTexture(mat,oldMat.sTexReflective, aiTextureType_REFLECTION);

	// Store the name of the material itself, too
	if( oldMat.mName.length())	{
		aiString tex;
		tex.Set( oldMat.mName);
		mat.AddProperty( &tex, AI_MATKEY_NAME);
	}
}

// ------------------------------------------------------------------------------------------------
// Split meshes by their materials and generate output aiMesh'es
void Discreet3DSImporter::ConvertMeshes(aiScene* pcOut)
{
	std::vector<aiMesh*> avOutMeshes;
	avOutMeshes.reserve(mScene->mMeshes.size() * 2);

	unsigned int iFaceCnt = 0,num = 0;
	aiString name;

	// we need to split all meshes by their materials
	for (std::vector<D3DS::Mesh>::iterator i =  mScene->mMeshes.begin(); i != mScene->mMeshes.end();++i)	{
		boost::scoped_array< std::vector<unsigned int> > aiSplit(new std::vector<unsigned int>[mScene->mMaterials.size()]);

		name.length = ASSIMP_itoa10(name.data,num++);

		unsigned int iNum = 0;
		for (std::vector<unsigned int>::const_iterator a =  (*i).mFaceMaterials.begin();
			a != (*i).mFaceMaterials.end();++a,++iNum)
		{
			aiSplit[*a].push_back(iNum);
		}
		// now generate submeshes
		for (unsigned int p = 0; p < mScene->mMaterials.size();++p)
		{
			if (aiSplit[p].empty())	{
				continue;
			}
			aiMesh* meshOut = new aiMesh();
			meshOut->mName = name;
			meshOut->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

			// be sure to setup the correct material index
			meshOut->mMaterialIndex = p;

			// use the color data as temporary storage
			meshOut->mColors[0] = (aiColor4D*)(&*i);
			avOutMeshes.push_back(meshOut);

			// convert vertices
			meshOut->mNumFaces = (unsigned int)aiSplit[p].size();
			meshOut->mNumVertices = meshOut->mNumFaces*3;

			// allocate enough storage for faces
			meshOut->mFaces = new aiFace[meshOut->mNumFaces];
			iFaceCnt += meshOut->mNumFaces;

			meshOut->mVertices = new aiVector3D[meshOut->mNumVertices];
			meshOut->mNormals  = new aiVector3D[meshOut->mNumVertices];
			if ((*i).mTexCoords.size())
			{
				meshOut->mTextureCoords[0] = new aiVector3D[meshOut->mNumVertices];
			}
			for (unsigned int q = 0, base = 0; q < aiSplit[p].size();++q)
			{
				register unsigned int index = aiSplit[p][q];
				aiFace& face = meshOut->mFaces[q];

				face.mIndices = new unsigned int[3];
				face.mNumIndices = 3;

				for (unsigned int a = 0; a < 3;++a,++base)
				{
					unsigned int idx = (*i).mFaces[index].mIndices[a];
					meshOut->mVertices[base]  = (*i).mPositions[idx];
					meshOut->mNormals [base]  = (*i).mNormals[idx];

					if ((*i).mTexCoords.size())
						meshOut->mTextureCoords[0][base] = (*i).mTexCoords[idx];

					face.mIndices[a] = base;
				}
			}
		}
	}

	// Copy them to the output array
	pcOut->mNumMeshes = (unsigned int)avOutMeshes.size();
	pcOut->mMeshes = new aiMesh*[pcOut->mNumMeshes]();
	for (unsigned int a = 0; a < pcOut->mNumMeshes;++a) {
		pcOut->mMeshes[a] = avOutMeshes[a];
	}

	// We should have at least one face here
	if (!iFaceCnt) {
		throw DeadlyImportError("No faces loaded. The mesh is empty");
	}
}

// ------------------------------------------------------------------------------------------------
// Add a node to the scenegraph and setup its final transformation
void Discreet3DSImporter::AddNodeToGraph(aiScene* pcSOut,aiNode* pcOut,
	D3DS::Node* pcIn, aiMatrix4x4& absTrafo)
{
	std::vector<unsigned int> iArray;
	iArray.reserve(3);

	aiMatrix4x4 abs;

	// Find all meshes with the same name as the node
	for (unsigned int a = 0; a < pcSOut->mNumMeshes;++a)
	{
		const D3DS::Mesh* pcMesh = (const D3DS::Mesh*)pcSOut->mMeshes[a]->mColors[0];
		ai_assert(NULL != pcMesh);

		if (pcIn->mName == pcMesh->mName)
			iArray.push_back(a);
	}
	if (!iArray.empty())
	{
		// The matrix should be identical for all meshes with the 
		// same name. It HAS to be identical for all meshes .....
		D3DS::Mesh* imesh = ((D3DS::Mesh*)pcSOut->mMeshes[iArray[0]]->mColors[0]);

		// Compute the inverse of the transformation matrix to move the
		// vertices back to their relative and local space
		aiMatrix4x4 mInv = imesh->mMat, mInvTransposed = imesh->mMat;
		mInv.Inverse();mInvTransposed.Transpose();
		aiVector3D pivot = pcIn->vPivot;

		pcOut->mNumMeshes = (unsigned int)iArray.size();
		pcOut->mMeshes = new unsigned int[iArray.size()];
		for (unsigned int i = 0;i < iArray.size();++i)	{
			const unsigned int iIndex = iArray[i];
			aiMesh* const mesh = pcSOut->mMeshes[iIndex];

			// Transform the vertices back into their local space
			// fixme: consider computing normals after this, so we don't need to transform them
			const aiVector3D* const pvEnd = mesh->mVertices+mesh->mNumVertices;
			aiVector3D* pvCurrent = mesh->mVertices, *t2 = mesh->mNormals;

			for (;pvCurrent != pvEnd;++pvCurrent,++t2) {
				*pvCurrent = mInv * (*pvCurrent);
				*t2 = mInvTransposed * (*t2);
			}

			// Handle negative transformation matrix determinant -> invert vertex x
			if (imesh->mMat.Determinant() < 0.0f)
			{
				/* we *must* have normals */
				for (pvCurrent = mesh->mVertices,t2 = mesh->mNormals;pvCurrent != pvEnd;++pvCurrent,++t2) {
					pvCurrent->x *= -1.f;
					t2->x *= -1.f;
				}
				DefaultLogger::get()->info("3DS: Flipping mesh X-Axis");
			}

			// Handle pivot point
			if(pivot.x || pivot.y || pivot.z)
			{
				for (pvCurrent = mesh->mVertices;pvCurrent != pvEnd;++pvCurrent)	{
					*pvCurrent -= pivot;	
				}
			}

			// Setup the mesh index
			pcOut->mMeshes[i] = iIndex;
		}
	}

	// Setup the name of the node
	pcOut->mName.Set(pcIn->mName);

	// Now build the transformation matrix of the node
	// ROTATION
	if (pcIn->aRotationKeys.size()){

		// FIX to get to Assimp's quaternion conventions
		for (std::vector<aiQuatKey>::iterator it = pcIn->aRotationKeys.begin(); it != pcIn->aRotationKeys.end(); ++it) {
			(*it).mValue.w *= -1.f;
		}

		pcOut->mTransformation = aiMatrix4x4( pcIn->aRotationKeys[0].mValue.GetMatrix() );
	}
	else if (pcIn->aCameraRollKeys.size()) 
	{
		aiMatrix4x4::RotationZ(AI_DEG_TO_RAD(- pcIn->aCameraRollKeys[0].mValue),
			pcOut->mTransformation);
	}

	// SCALING
	aiMatrix4x4& m = pcOut->mTransformation;
	if (pcIn->aScalingKeys.size())
	{
		const aiVector3D& v = pcIn->aScalingKeys[0].mValue;
		m.a1 *= v.x; m.b1 *= v.x; m.c1 *= v.x;
		m.a2 *= v.y; m.b2 *= v.y; m.c2 *= v.y;
		m.a3 *= v.z; m.b3 *= v.z; m.c3 *= v.z;
	}

	// TRANSLATION
	if (pcIn->aPositionKeys.size())
	{
		const aiVector3D& v = pcIn->aPositionKeys[0].mValue;
		m.a4 += v.x;
		m.b4 += v.y;
		m.c4 += v.z;
	}

	// Generate animation channels for the node
	if (pcIn->aPositionKeys.size()  > 1  || pcIn->aRotationKeys.size()   > 1 ||
		pcIn->aScalingKeys.size()   > 1  || pcIn->aCameraRollKeys.size() > 1 ||
		pcIn->aTargetPositionKeys.size() > 1)
	{
		aiAnimation* anim = pcSOut->mAnimations[0];
		ai_assert(NULL != anim);

		if (pcIn->aCameraRollKeys.size() > 1)
		{
			DefaultLogger::get()->debug("3DS: Converting camera roll track ...");

			// Camera roll keys - in fact they're just rotations
			// around the camera's z axis. The angles are given
			// in degrees (and they're clockwise).
			pcIn->aRotationKeys.resize(pcIn->aCameraRollKeys.size());
			for (unsigned int i = 0; i < pcIn->aCameraRollKeys.size();++i)
			{
				aiQuatKey&  q = pcIn->aRotationKeys[i];
				aiFloatKey& f = pcIn->aCameraRollKeys[i];

				q.mTime  = f.mTime;

				// FIX to get to Assimp quaternion conventions
				q.mValue = aiQuaternion(0.f,0.f,AI_DEG_TO_RAD( /*-*/ f.mValue));
			}
		}
#if 0
		if (pcIn->aTargetPositionKeys.size() > 1)
		{
			DefaultLogger::get()->debug("3DS: Converting target track ...");

			// Camera or spot light - need to convert the separate
			// target position channel to our representation
			TargetAnimationHelper helper;

			if (pcIn->aPositionKeys.empty())
			{
				// We can just pass zero here ...
				helper.SetFixedMainAnimationChannel(aiVector3D());
			}
			else  helper.SetMainAnimationChannel(&pcIn->aPositionKeys);
			helper.SetTargetAnimationChannel(&pcIn->aTargetPositionKeys);

			// Do the conversion
			std::vector<aiVectorKey> distanceTrack;
			helper.Process(&distanceTrack);

			// Now add a new node as child, name it <ourName>.Target
			// and assign the distance track to it. This is that the
			// information where the target is and how it moves is
			// not lost
			D3DS::Node* nd = new D3DS::Node();
			pcIn->push_back(nd);

			nd->mName = pcIn->mName + ".Target";

			aiNodeAnim* nda = anim->mChannels[anim->mNumChannels++] = new aiNodeAnim();
			nda->mNodeName.Set(nd->mName);

			nda->mNumPositionKeys = (unsigned int)distanceTrack.size();
			nda->mPositionKeys = new aiVectorKey[nda->mNumPositionKeys];
			::memcpy(nda->mPositionKeys,&distanceTrack[0],
				sizeof(aiVectorKey)*nda->mNumPositionKeys);
		}
#endif

		// Cameras or lights define their transformation in their parent node and in the
		// corresponding light or camera chunks. However, we read and process the latter
		// to to be able to return valid cameras/lights even if no scenegraph is given.
		for (unsigned int n = 0; n < pcSOut->mNumCameras;++n)	{
			if (pcSOut->mCameras[n]->mName == pcOut->mName) {
				pcSOut->mCameras[n]->mLookAt = aiVector3D(0.f,0.f,1.f);
			}
		}
		for (unsigned int n = 0; n < pcSOut->mNumLights;++n)	{
			if (pcSOut->mLights[n]->mName == pcOut->mName) {
				pcSOut->mLights[n]->mDirection = aiVector3D(0.f,0.f,1.f);
			}
		}

		// Allocate a new node anim and setup its name
		aiNodeAnim* nda = anim->mChannels[anim->mNumChannels++] = new aiNodeAnim();
		nda->mNodeName.Set(pcIn->mName);

		// POSITION keys
		if (pcIn->aPositionKeys.size()  > 0)
		{
			nda->mNumPositionKeys = (unsigned int)pcIn->aPositionKeys.size();
			nda->mPositionKeys = new aiVectorKey[nda->mNumPositionKeys];
			::memcpy(nda->mPositionKeys,&pcIn->aPositionKeys[0],
				sizeof(aiVectorKey)*nda->mNumPositionKeys);
		}

		// ROTATION keys
		if (pcIn->aRotationKeys.size()  > 0)
		{
			nda->mNumRotationKeys = (unsigned int)pcIn->aRotationKeys.size();
			nda->mRotationKeys = new aiQuatKey[nda->mNumRotationKeys];

			// Rotations are quaternion offsets
			aiQuaternion abs;
			for (unsigned int n = 0; n < nda->mNumRotationKeys;++n)
			{
				const aiQuatKey& q = pcIn->aRotationKeys[n];

				abs = (n ? abs * q.mValue : q.mValue);
				nda->mRotationKeys[n].mTime  = q.mTime;
				nda->mRotationKeys[n].mValue = abs.Normalize();
			}
		}

		// SCALING keys
		if (pcIn->aScalingKeys.size()  > 0)
		{
			nda->mNumScalingKeys = (unsigned int)pcIn->aScalingKeys.size();
			nda->mScalingKeys = new aiVectorKey[nda->mNumScalingKeys];
			::memcpy(nda->mScalingKeys,&pcIn->aScalingKeys[0],
				sizeof(aiVectorKey)*nda->mNumScalingKeys);
		}
	}

	// Allocate storage for children 
	pcOut->mNumChildren = (unsigned int)pcIn->mChildren.size();
	pcOut->mChildren = new aiNode*[pcIn->mChildren.size()];

	// Recursively process all children
	const unsigned int size = pcIn->mChildren.size();
	for (unsigned int i = 0; i < size;++i)
	{
		pcOut->mChildren[i] = new aiNode();
		pcOut->mChildren[i]->mParent = pcOut;
		AddNodeToGraph(pcSOut,pcOut->mChildren[i],pcIn->mChildren[i],abs);
	}
}

// ------------------------------------------------------------------------------------------------
// Find out how many node animation channels we'll have finally
void CountTracks(D3DS::Node* node, unsigned int& cnt)
{
	//////////////////////////////////////////////////////////////////////////////
	// We will never generate more than one channel for a node, so
	// this is rather easy here.

	if (node->aPositionKeys.size()  > 1  || node->aRotationKeys.size()   > 1   ||
		node->aScalingKeys.size()   > 1  || node->aCameraRollKeys.size() > 1 ||
		node->aTargetPositionKeys.size()  > 1)
	{
		++cnt;

		// account for the additional channel for the camera/spotlight target position
		if (node->aTargetPositionKeys.size()  > 1)++cnt;
	}

	// Recursively process all children
	for (unsigned int i = 0; i < node->mChildren.size();++i)
		CountTracks(node->mChildren[i],cnt);
}

// ------------------------------------------------------------------------------------------------
// Generate the output node graph
void Discreet3DSImporter::GenerateNodeGraph(aiScene* pcOut)
{
	pcOut->mRootNode = new aiNode();
	if (0 == mRootNode->mChildren.size())
	{
		//////////////////////////////////////////////////////////////////////////////
		// It seems the file is so fucked up that it has not even a hierarchy.
		// generate a flat hiearachy which looks like this:
		//
		//                ROOT_NODE
		//                   |
		//   ----------------------------------------
		//   |       |       |            |         |  
		// MESH_0  MESH_1  MESH_2  ...  MESH_N    CAMERA_0 ....
		//
		DefaultLogger::get()->warn("No hierarchy information has been found in the file. ");

		pcOut->mRootNode->mNumChildren = pcOut->mNumMeshes + 
			mScene->mCameras.size() + mScene->mLights.size();

		pcOut->mRootNode->mChildren = new aiNode* [ pcOut->mRootNode->mNumChildren ];
		pcOut->mRootNode->mName.Set("<3DSDummyRoot>");

		// Build dummy nodes for all meshes
		unsigned int a = 0;
		for (unsigned int i = 0; i < pcOut->mNumMeshes;++i,++a)
		{
			aiNode* pcNode = pcOut->mRootNode->mChildren[a] = new aiNode();
			pcNode->mParent = pcOut->mRootNode;
			pcNode->mMeshes = new unsigned int[1];
			pcNode->mMeshes[0] = i;
			pcNode->mNumMeshes = 1;

			// Build a name for the node
			pcNode->mName.length = sprintf(pcNode->mName.data,"3DSMesh_%i",i);	
		}

		// Build dummy nodes for all cameras
		for (unsigned int i = 0; i < (unsigned int )mScene->mCameras.size();++i,++a)
		{
			aiNode* pcNode = pcOut->mRootNode->mChildren[a] = new aiNode();
			pcNode->mParent = pcOut->mRootNode;

			// Build a name for the node
			pcNode->mName = mScene->mCameras[i]->mName;
		}

		// Build dummy nodes for all lights
		for (unsigned int i = 0; i < (unsigned int )mScene->mLights.size();++i,++a)
		{
			aiNode* pcNode = pcOut->mRootNode->mChildren[a] = new aiNode();
			pcNode->mParent = pcOut->mRootNode;

			// Build a name for the node
			pcNode->mName = mScene->mLights[i]->mName;
		}
	}
	else
	{
		// First of all: find out how many scaling, rotation and translation
		// animation tracks we'll have afterwards
		unsigned int numChannel = 0;
		CountTracks(mRootNode,numChannel);

		if (numChannel)
		{
			// Allocate a primary animation channel
			pcOut->mNumAnimations = 1;
			pcOut->mAnimations    = new aiAnimation*[1];
			aiAnimation* anim     = pcOut->mAnimations[0] = new aiAnimation();

			anim->mName.Set("3DSMasterAnim");

			// Allocate enough storage for all node animation channels, 
			// but don't set the mNumChannels member - we'll use it to
			// index into the array
			anim->mChannels = new aiNodeAnim*[numChannel];
		}

		aiMatrix4x4 m;
		AddNodeToGraph(pcOut,  pcOut->mRootNode, mRootNode,m);
	}

	// We used the first vertex color set to store some emporary values so we need to cleanup here
	for (unsigned int a = 0; a < pcOut->mNumMeshes;++a)
		pcOut->mMeshes[a]->mColors[0] = NULL;

	// Now rotate the whole scene 90 degrees around the x axis to convert to internal coordinate system
	pcOut->mRootNode->mTransformation = aiMatrix4x4(1.f,0.f,0.f,0.f,
		0.f,0.f,1.f,0.f,0.f,-1.f,0.f,0.f,0.f,0.f,0.f,1.f) * pcOut->mRootNode->mTransformation;

	// If the root node is unnamed name it "<3DSRoot>"
	if (::strstr( pcOut->mRootNode->mName.data, "UNNAMED" ) ||
		(pcOut->mRootNode->mName.data[0] == '$' && pcOut->mRootNode->mName.data[1] == '$') )
	{
		pcOut->mRootNode->mName.Set("<3DSRoot>");
	}
}

// ------------------------------------------------------------------------------------------------
// Convert all meshes in the scene and generate the final output scene.
void Discreet3DSImporter::ConvertScene(aiScene* pcOut)
{
	// Allocate enough storage for all output materials
	pcOut->mNumMaterials = (unsigned int)mScene->mMaterials.size();
	pcOut->mMaterials    = new aiMaterial*[pcOut->mNumMaterials];

	//  ... and convert the 3DS materials to aiMaterial's
	for (unsigned int i = 0; i < pcOut->mNumMaterials;++i)
	{
		MaterialHelper* pcNew = new MaterialHelper();
		ConvertMaterial(mScene->mMaterials[i],*pcNew);
		pcOut->mMaterials[i] = pcNew;
	}

	// Generate the output mesh list
	ConvertMeshes(pcOut);

	// Now copy all light sources to the output scene
	pcOut->mNumLights = (unsigned int)mScene->mLights.size();
	if (pcOut->mNumLights)
	{
		pcOut->mLights = new aiLight*[pcOut->mNumLights];
		::memcpy(pcOut->mLights,&mScene->mLights[0],sizeof(void*)*pcOut->mNumLights);
	}

	// Now copy all cameras to the output scene
	pcOut->mNumCameras = (unsigned int)mScene->mCameras.size();
	if (pcOut->mNumCameras)
	{
		pcOut->mCameras = new aiCamera*[pcOut->mNumCameras];
		::memcpy(pcOut->mCameras,&mScene->mCameras[0],sizeof(void*)*pcOut->mNumCameras);
	}
}

#endif // !! ASSIMP_BUILD_NO_3DS_IMPORTER