assimp.assimp/code/LWOMaterial.cpp

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

/** @file Implementation of the material oart of the LWO importer class */


#include "AssimpPCH.h"

// internal headers
#include "LWOLoader.h"
#include "MaterialSystem.h"
#include "ByteSwap.h"

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
template <class T>
T lerp(const T& one, const T& two, float val)
{
	return one + (two-one)*val;
}

// ------------------------------------------------------------------------------------------------
// Convert a lightwave mapping mode to our's
inline aiTextureMapMode GetMapMode(LWO::Texture::Wrap in)
{
	switch (in)
	{	
		case LWO::Texture::REPEAT:
			return aiTextureMapMode_Wrap;

		case LWO::Texture::MIRROR:
			return aiTextureMapMode_Mirror;

		case LWO::Texture::RESET:
			DefaultLogger::get()->warn("LWO2: Unsupported texture map mode: RESET");

			// fall though here
		case LWO::Texture::EDGE:
			return aiTextureMapMode_Clamp;
	}
	return (aiTextureMapMode)0;
}

// ------------------------------------------------------------------------------------------------
bool LWOImporter::HandleTextures(MaterialHelper* pcMat, const TextureList& in, aiTextureType type)
{
	ai_assert(NULL != pcMat);

	unsigned int cur = 0, temp = 0;
	aiString s;
	bool ret = false;

	for (TextureList::const_iterator it = in.begin(), end = in.end();
		 it != end;++it)
	{
		if (!(*it).enabled || !(*it).bCanUse)continue;
		ret = true;

		// Convert lightwave's mapping modes to ours. We let them
		// as they are, the GenUVcoords step will compute UV 
		// channels if they're not there.

		aiTextureMapping mapping;
		switch ((*it).mapMode)
		{
			case LWO::Texture::Planar:
				mapping = aiTextureMapping_PLANE;
				break;
			case LWO::Texture::Cylindrical:
				mapping = aiTextureMapping_CYLINDER;
				break;
			case LWO::Texture::Spherical:
				mapping = aiTextureMapping_SPHERE;
				break;
			case LWO::Texture::Cubic:
				mapping = aiTextureMapping_BOX;
				break;
			case LWO::Texture::FrontProjection:
				DefaultLogger::get()->error("LWO2: Unsupported texture mapping: FrontProjection");
				mapping = aiTextureMapping_OTHER;
				break;
			case LWO::Texture::UV:
				{
					if( 0xffffffff == (*it).mRealUVIndex )
					{
						// We have no UV index for this texture, so we can't display it
						continue;
					}

					// add the UV source index
					temp = (*it).mRealUVIndex;
					pcMat->AddProperty<int>((int*)&temp,1,AI_MATKEY_UVWSRC(type,cur));

					mapping = aiTextureMapping_UV;
				}
				break;
		};

		if (mapping != aiTextureMapping_UV)
		{
			// Setup the main axis (the enum values map one to one)
			pcMat->AddProperty<int>((int*)&(*it).majorAxis,1,AI_MATKEY_TEXMAP_AXIS(type,cur));
			DefaultLogger::get()->debug("LWO2: Setting up non-UV mapping");
		}


		// The older LWOB format does not use indirect references to clips.
		// The file name of a texture is directly specified in the tex chunk.
		if (mIsLWO2)
		{
			// find the corresponding clip
			ClipList::iterator clip = mClips.begin();
			temp = (*it).mClipIdx;
			for (ClipList::iterator end = mClips.end(); clip != end; ++clip)
			{
				if ((*clip).idx == temp)
				{
					break;
				}
			}
			if (mClips.end() == clip)
			{
				DefaultLogger::get()->error("LWO2: Clip index is out of bounds");
				temp = 0;
			}
			if (Clip::UNSUPPORTED == (*clip).type)
			{
				DefaultLogger::get()->error("LWO2: Clip type is not supported");
				continue;
			}
			AdjustTexturePath((*clip).path);
			s.Set((*clip).path);
		}
		else 
		{
			std::string ss = (*it).mFileName;
			if (!ss.length())
			{
				DefaultLogger::get()->error("LWOB: Empty file name");
				continue;
			}
			AdjustTexturePath(ss);
			s.Set(ss);
		}
		pcMat->AddProperty(&s,AI_MATKEY_TEXTURE(type,cur));

		// add the blend factor
		pcMat->AddProperty<float>(&(*it).mStrength,1,AI_MATKEY_TEXBLEND(type,cur));

		// add the blend operation
		switch ((*it).blendType)
		{
			case LWO::Texture::Normal:
			case LWO::Texture::Multiply:
				temp = (unsigned int)aiTextureOp_Multiply;
				break;

			case LWO::Texture::Subtractive:
			case LWO::Texture::Difference:
				temp = (unsigned int)aiTextureOp_Subtract;
				break;

			case LWO::Texture::Divide:
				temp = (unsigned int)aiTextureOp_Divide;
				break;

			case LWO::Texture::Additive:
				temp = (unsigned int)aiTextureOp_Add;
				break;

			default:
				temp = (unsigned int)aiTextureOp_Multiply;
				DefaultLogger::get()->warn("LWO2: Unsupported texture blend mode: alpha or displacement");

		}
		pcMat->AddProperty<int>((int*)&temp,1,AI_MATKEY_TEXOP(type,cur));

		// setup the mapping mode
		pcMat->AddProperty<int>((int*)&mapping,1,AI_MATKEY_MAPPING(type,cur));

		// add the u-wrapping
		temp = (unsigned int)GetMapMode((*it).wrapModeWidth);
		pcMat->AddProperty<int>((int*)&temp,1,AI_MATKEY_MAPPINGMODE_U(type,cur));

		// add the v-wrapping
		temp = (unsigned int)GetMapMode((*it).wrapModeHeight);
		pcMat->AddProperty<int>((int*)&temp,1,AI_MATKEY_MAPPINGMODE_V(type,cur));

		++cur;
	}
	return ret;
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::ConvertMaterial(const LWO::Surface& surf,MaterialHelper* pcMat)
{
	// copy the name of the surface
	aiString st;
	st.Set(surf.mName);
	pcMat->AddProperty(&st,AI_MATKEY_NAME);

	int i = surf.bDoubleSided ? 1 : 0;
	pcMat->AddProperty<int>(&i,1,AI_MATKEY_TWOSIDED);

	// add the refraction index and the bump intensity
	pcMat->AddProperty<float>(&surf.mIOR,1,AI_MATKEY_REFRACTI);
	pcMat->AddProperty<float>(&surf.mBumpIntensity,1,AI_MATKEY_BUMPSCALING);
	
	aiShadingMode m;
	if (surf.mSpecularValue && surf.mGlossiness)
	{
		float fGloss;
		if (mIsLWO2)
		{
			fGloss = pow( surf.mGlossiness*10.0f+2.0f, 2.0f);
		}
		else
		{
			if (16.0f >= surf.mGlossiness)fGloss = 6.0f;
			else if (64.0f >= surf.mGlossiness)fGloss = 20.0f;
			else if (256.0f >= surf.mGlossiness)fGloss = 50.0f;
			else fGloss = 80.0f;
		}

		pcMat->AddProperty<float>(&surf.mSpecularValue,1,AI_MATKEY_SHININESS_STRENGTH);
		pcMat->AddProperty<float>(&fGloss,1,AI_MATKEY_SHININESS);
		m = aiShadingMode_Phong;
	}
	else m = aiShadingMode_Gouraud;

	// specular color
	aiColor3D clr = lerp( aiColor3D(1.f,1.f,1.f), surf.mColor, surf.mColorHighlights );
	pcMat->AddProperty<aiColor3D>(&clr,1,AI_MATKEY_COLOR_SPECULAR);
	pcMat->AddProperty<float>(&surf.mSpecularValue,1,AI_MATKEY_SHININESS_STRENGTH);

	// emissive color
	// (luminosity is not really the same but it affects the surface in 
	//  a similar way. However, some scalings seems to be necessary)
	clr.g = clr.b = clr.r = surf.mLuminosity*0.8f;
	pcMat->AddProperty<aiColor3D>(&clr,1,AI_MATKEY_COLOR_EMISSIVE);

	// opacity
	if (10e10f != surf.mTransparency)
	{
		float f = 1.0f-surf.mTransparency;
		pcMat->AddProperty<float>(&f,1,AI_MATKEY_OPACITY);
	}

	// ADD TEXTURES to the material
	// TODO: find out how we can handle COLOR textures correctly...
	bool b = HandleTextures(pcMat,surf.mColorTextures,aiTextureType_DIFFUSE);
	b = (b || HandleTextures(pcMat,surf.mDiffuseTextures,aiTextureType_DIFFUSE));
	HandleTextures(pcMat,surf.mSpecularTextures,aiTextureType_SPECULAR);
	HandleTextures(pcMat,surf.mGlossinessTextures,aiTextureType_SHININESS);
	HandleTextures(pcMat,surf.mBumpTextures,aiTextureType_HEIGHT);
	HandleTextures(pcMat,surf.mOpacityTextures,aiTextureType_OPACITY);

	// now we need to know which shader we must use
	// iterate through the shader list of the surface and 
	// search for a name we know 
	for (ShaderList::const_iterator it = surf.mShaders.begin(), end = surf.mShaders.end();
		 it != end;++it)
	{
		//if (!(*it).enabled)continue;
		if ((*it).functionName == "LW_SuperCelShader" ||
			(*it).functionName == "AH_CelShader")
		{
			DefaultLogger::get()->info("Mapping LW_SuperCelShader/AH_CelShader "
				"to aiShadingMode_Toon");

			m = aiShadingMode_Toon;
			break;
		}
		else if ((*it).functionName == "LW_RealFresnel" ||
			(*it).functionName == "LW_FastFresnel")
		{
			DefaultLogger::get()->info("Mapping LW_RealFresnel/LW_FastFresnel "
				"to aiShadingMode_Fresnel");

			m = aiShadingMode_Fresnel;
			break;
		}
		else
		{
			DefaultLogger::get()->warn("LWO2: Unknown surface shader: " + (*it).functionName);
		}
	}
	if (surf.mMaximumSmoothAngle <= 0.0f)m = aiShadingMode_Flat;
	pcMat->AddProperty((int*)&m,1,AI_MATKEY_SHADING_MODEL);

	// (the diffuse value is just a scaling factor)
	// If a diffuse texture is set, we set this value to 1.0
	clr = (b ? aiColor3D(1.f,1.f,1.f) : surf.mColor);
	clr.r *= surf.mDiffuseValue;
	clr.g *= surf.mDiffuseValue;
	clr.b *= surf.mDiffuseValue;
	pcMat->AddProperty<aiColor3D>(&clr,1,AI_MATKEY_COLOR_DIFFUSE);
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::FindUVChannels(LWO::TextureList& list, LWO::Layer& layer,
	unsigned int out[AI_MAX_NUMBER_OF_TEXTURECOORDS], unsigned int& next)
{
	for (TextureList::iterator it = list.begin(), end = list.end();
		 it != end;++it)
	{
		// Ignore textures with non-UV mappings for the moment.
		if (!(*it).enabled || !(*it).bCanUse || 0xffffffff != (*it).mRealUVIndex ||
			(*it).mapMode != LWO::Texture::UV)
		{
			continue;
		}
		for (unsigned int i = 0; i < layer.mUVChannels.size();++i)
		{
			if ((*it).mUVChannelIndex == layer.mUVChannels[i].name)
			{
				// check whether we have this channel already
				for (unsigned int m = 0; m < next;++m)
				{
					if (i == out[m])
					{
						(*it).mRealUVIndex = m;
					}
				}
				if (0xffffffff == (*it).mRealUVIndex)
				{
					(*it).mRealUVIndex = next;
					out[next++] = i;
					if (AI_MAX_NUMBER_OF_TEXTURECOORDS != next)
						out[next] = 0xffffffff;
					break;
				}
			}
		}
		if (0xffffffff == (*it).mRealUVIndex)
			DefaultLogger::get()->error("LWO2: Unable to find matching UV channel for a texture");
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::FindUVChannels(LWO::Surface& surf, LWO::Layer& layer,
	unsigned int out[AI_MAX_NUMBER_OF_TEXTURECOORDS])
{
	out[0] = 0xffffffff;
	unsigned int next = 0;

	FindUVChannels(surf.mColorTextures,layer,out,next);
	FindUVChannels(surf.mDiffuseTextures,layer,out,next);
	FindUVChannels(surf.mSpecularTextures,layer,out,next);
	FindUVChannels(surf.mGlossinessTextures,layer,out,next);
	FindUVChannels(surf.mOpacityTextures,layer,out,next);
	FindUVChannels(surf.mBumpTextures,layer,out,next);
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::FindVCChannels(const LWO::Surface& surf, const LWO::Layer& layer,
	unsigned int out[AI_MAX_NUMBER_OF_COLOR_SETS])
{
	out[0] = 0xffffffff;
	if (surf.mVCMap.length())
	{
		for (unsigned int i = 0; i < layer.mVColorChannels.size();++i)
		{
			if (surf.mVCMap == layer.mVColorChannels[i].name)
			{
				out[0] = i;
				out[1] = 0xffffffff;
				return;
			}
		}
		DefaultLogger::get()->warn("LWO2: Unable to find vertex color channel: " + surf.mVCMap);
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2ImageMap(unsigned int size, LWO::Texture& tex )
{
	LE_NCONST uint8_t* const end = mFileBuffer + size;
	while (true)
	{
		if (mFileBuffer + 6 >= end)break;
		LE_NCONST IFF::SubChunkHeader* const head = IFF::LoadSubChunk(mFileBuffer);

		if (mFileBuffer + head->length > end)
			throw new ImportErrorException("LWO2: Invalid SURF.BLOCK chunk length");

		uint8_t* const next = mFileBuffer+head->length;
		switch (head->type)
		{
		case AI_LWO_PROJ:
			tex.mapMode = (Texture::MappingMode)GetU2();
			break;
		case AI_LWO_WRAP:
			tex.wrapModeWidth  = (Texture::Wrap)GetU2();
			tex.wrapModeHeight = (Texture::Wrap)GetU2();
			break;
		case AI_LWO_AXIS:
			tex.majorAxis = (Texture::Axes)GetU2();
			break;
		case AI_LWO_IMAG:
			tex.mClipIdx = GetU2();
			break;
		case AI_LWO_VMAP:
			GetS0(tex.mUVChannelIndex,head->length);
			break;
		case AI_LWO_WRPH:
			tex.wrapAmountH = GetF4();
			break;
		case AI_LWO_WRPW:
			tex.wrapAmountW = GetF4();
			break;
		}
		mFileBuffer = next;
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2Procedural(unsigned int size, LWO::Texture& tex )
{
	// --- not supported at the moment
	DefaultLogger::get()->error("LWO2: Found procedural texture, this is not supported");
	tex.bCanUse = false;
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2Gradient(unsigned int size, LWO::Texture& tex  )
{
	// --- not supported at the moment
	DefaultLogger::get()->error("LWO2: Found gradient texture, this is not supported");
	tex.bCanUse = false;
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2TextureHeader(unsigned int size, LWO::Texture& tex )
{
	LE_NCONST uint8_t* const end = mFileBuffer + size;

	// get the ordinal string
	GetS0( tex.ordinal, size);

	// we could crash later if this is an empty string ...
	if (!tex.ordinal.length())
	{
		DefaultLogger::get()->error("LWO2: Ill-formed SURF.BLOK ordinal string");
		tex.ordinal = "\x00";
	}
	while (true)
	{
		if (mFileBuffer + 6 >= end)break;
		LE_NCONST IFF::SubChunkHeader* const head = IFF::LoadSubChunk(mFileBuffer);

		if (mFileBuffer + head->length > end)
			throw new ImportErrorException("LWO2: Invalid texture header chunk length");

		uint8_t* const next = mFileBuffer+head->length;
		switch (head->type)
		{
		case AI_LWO_CHAN:
			tex.type = GetU4();
			break;
		case AI_LWO_ENAB:
			tex.enabled = GetU2() ? true : false;
			break;
		case AI_LWO_OPAC:
			tex.blendType = (Texture::BlendType)GetU2();
			tex.mStrength = GetF4();
			break;
		}
		mFileBuffer = next;
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2TextureBlock(LE_NCONST IFF::SubChunkHeader* head, unsigned int size )
{
	ai_assert(!mSurfaces->empty());
	LWO::Surface& surf = mSurfaces->back();
	LWO::Texture tex;

	// load the texture header
	LoadLWO2TextureHeader(head->length,tex);
	size -= head->length + 6;

	// now get the exact type of the texture
	switch (head->type)
	{
	case AI_LWO_PROC:
		LoadLWO2Procedural(size,tex);
		break;
	case AI_LWO_GRAD:
		LoadLWO2Gradient(size,tex); 
		break;
	case AI_LWO_IMAP:
		LoadLWO2ImageMap(size,tex);
	}

	// get the destination channel
	TextureList* listRef = NULL;
	switch (tex.type)
	{
	case AI_LWO_COLR:
		listRef = &surf.mColorTextures;break;
	case AI_LWO_DIFF:
		listRef = &surf.mDiffuseTextures;break;
	case AI_LWO_SPEC:
		listRef = &surf.mSpecularTextures;break;
	case AI_LWO_GLOS:
		listRef = &surf.mGlossinessTextures;break;
	case AI_LWO_BUMP:
		listRef = &surf.mBumpTextures;break;
	case AI_LWO_TRAN:
		listRef = &surf.mOpacityTextures;break;
	default:
		DefaultLogger::get()->warn("LWO2: Encountered unknown texture type");
		return;
	}

	// now attach the texture to the parent surface - sort by ordinal string
	for (TextureList::iterator it = listRef->begin();
		it != listRef->end(); ++it)
	{
		if (::strcmp(tex.ordinal.c_str(),(*it).ordinal.c_str()) < 0)
		{
			listRef->insert(it,tex);
			return;
		}
	}
	listRef->push_back(tex);
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2ShaderBlock(LE_NCONST IFF::SubChunkHeader* head, unsigned int size )
{
	LE_NCONST uint8_t* const end = mFileBuffer + size;

	ai_assert(!mSurfaces->empty());
	LWO::Surface& surf = mSurfaces->back();
	LWO::Shader shader;

	// get the ordinal string
	GetS0( shader.ordinal, size);

	// we could crash later if this is an empty string ...
	if (!shader.ordinal.length())
	{
		DefaultLogger::get()->error("LWO2: Ill-formed SURF.BLOK ordinal string");
		shader.ordinal = "\x00";
	}

	// read the header
	while (true)
	{
		if (mFileBuffer + 6 >= end)break;
		LE_NCONST IFF::SubChunkHeader* const head = IFF::LoadSubChunk(mFileBuffer);

		if (mFileBuffer + head->length > end)
			throw new ImportErrorException("LWO2: Invalid shader header chunk length");

		uint8_t* const next = mFileBuffer+head->length;
		switch (head->type)
		{
		case AI_LWO_ENAB:
			shader.enabled = GetU2() ? true : false;
			break;

		case AI_LWO_FUNC:
			GetS0( shader.functionName, head->length );
		}
		mFileBuffer = next;
	}

	// now attach the shader to the parent surface - sort by ordinal string
	for (ShaderList::iterator it = surf.mShaders.begin();
		it != surf.mShaders.end(); ++it)
	{
		if (::strcmp(shader.ordinal.c_str(),(*it).ordinal.c_str()) < 0)
		{
			surf.mShaders.insert(it,shader);
			return;
		}
	}
	surf.mShaders.push_back(shader);
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2Surface(unsigned int size)
{
	LE_NCONST uint8_t* const end = mFileBuffer + size;

	mSurfaces->push_back( LWO::Surface () );
	LWO::Surface& surf = mSurfaces->back();

	GetS0(surf.mName,size);

	// check whether this surface was derived from any other surface
	std::string derived;
	GetS0(derived,(unsigned int)(end - mFileBuffer));
	if (derived.length())
	{

		// yes, find this surface
		for (SurfaceList::iterator it = mSurfaces->begin(), end = mSurfaces->end()-1;
			 it != end; ++it)
		{
			if ((*it).mName == derived)
			{
				// we have it ...
				surf = *it;
				derived.clear();
			}
		}
		if (!derived.size())
			DefaultLogger::get()->warn("LWO2: Unable to find source surface: " + derived);
	}

	while (true)
	{
		if (mFileBuffer + 6 >= end)break;
		LE_NCONST IFF::SubChunkHeader* const head = IFF::LoadSubChunk(mFileBuffer);

		if (mFileBuffer + head->length > end)
			throw new ImportErrorException("LWO2: Invalid surface chunk length");

		uint8_t* const next = mFileBuffer+head->length;
		switch (head->type)
		{
			// diffuse color
		case AI_LWO_COLR:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,COLR,12);
				surf.mColor.r = GetF4();
				surf.mColor.g = GetF4();
				surf.mColor.b = GetF4();
				break;
			}
			// diffuse strength ... hopefully
		case AI_LWO_DIFF:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,DIFF,4);
				surf.mDiffuseValue = GetF4();
				break;
			}
			// specular strength ... hopefully
		case AI_LWO_SPEC:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,SPEC,4);
				surf.mSpecularValue = GetF4();
				break;
			}
			// transparency
		case AI_LWO_TRAN:
			{
				if (surf.mTransparency == 10e10f)break;

				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,TRAN,4);
				surf.mTransparency = GetF4();
				break;
			}
			// transparency mode
		case AI_LWO_ALPH:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,ALPH,6);
				uint16_t mode = GetU2();
				switch (mode)
				{
					// The surface has no effect on the alpha channel when rendered
				case 0:
					surf.mTransparency = 10e10f;
					break;

					// The alpha channel will be written with the constant value
					// following the mode in the subchunk. 
				case 1:
					surf.mTransparency = GetF4();
					break;

					// The alpha value comes from the shadow density
				case 3:
					DefaultLogger::get()->error("LWO2: Unsupported alpha mode: shadow_density");
					surf.mTransparency = 10e10f;
				}
				break;
			}
			// wireframe mode
		case AI_LWO_LINE:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,LINE,2);
				if (GetU2() & 0x1)
					surf.mWireframe = true;
				break;
			}
			// glossiness
		case AI_LWO_GLOS:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,GLOS,4);
				surf.mGlossiness = GetF4();
				break;
			}
			// bump intensity
		case AI_LWO_BUMP:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,BUMP,4);
				surf.mBumpIntensity = GetF4();
				break;
			}
			// color highlights
		case AI_LWO_CLRH:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,CLRH,4);
				surf.mColorHighlights = GetF4();
				break;
			}
			// index of refraction
		case AI_LWO_RIND:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,RIND,4);
				surf.mIOR = GetF4();
				break;
			}
			// polygon sidedness
		case AI_LWO_SIDE:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,SIDE,2);
				surf.bDoubleSided = (3 == GetU2());
				break;
			}
			// maximum smoothing angle
		case AI_LWO_SMAN:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,SMAN,4);
				surf.mMaximumSmoothAngle = GetF4();
				break;
			}
			// vertex color channel to be applied to the surface
		case AI_LWO_VCOL:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,VCOL,12);
				surf.mDiffuseValue *= GetF4();				// strength
				ReadVSizedIntLWO2(mFileBuffer);             // skip envelope
				surf.mVCMapType = GetU4();					// type of the channel

				// name of the channel
				GetS0(surf.mVCMap, (unsigned int) (next - mFileBuffer ));
				break;
			}
			// surface bock entry
		case AI_LWO_BLOK:
			{
				AI_LWO_VALIDATE_CHUNK_LENGTH(head->length,BLOK,4);
				LE_NCONST IFF::SubChunkHeader* head2 = IFF::LoadSubChunk(mFileBuffer);

				switch (head2->type)
				{
				case AI_LWO_PROC:
				case AI_LWO_GRAD:
				case AI_LWO_IMAP:
					LoadLWO2TextureBlock(head2, head->length);
					break;
				case AI_LWO_SHDR:
					LoadLWO2ShaderBlock(head2, head->length);
					break;

				default:
					DefaultLogger::get()->warn("LWO2: Found an unsupported surface BLOK");
				};

				break;
			}
		}
		mFileBuffer = next;
	}
}