assimp/code/IFCMaterial.cpp

/*
Open Asset Import Library (assimp)
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/** @file  IFCMaterial.cpp
 *  @brief Implementation of conversion routines to convert IFC materials to aiMaterial
 */

#include "AssimpPCH.h"

#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER
#include "IFCUtil.h"
#include <limits>

namespace Assimp {
	namespace IFC {

// ------------------------------------------------------------------------------------------------
int ConvertShadingMode(const std::string& name)
{
	if (name == "BLINN") {
		return aiShadingMode_Blinn;
	}
	else if (name == "FLAT" || name == "NOTDEFINED") {
		return aiShadingMode_NoShading;
	}
	else if (name == "PHONG") {
		return aiShadingMode_Phong;
	}
	IFCImporter::LogWarn("shading mode "+name+" not recognized by Assimp, using Phong instead");
	return aiShadingMode_Phong;
}

// ------------------------------------------------------------------------------------------------
void FillMaterial(aiMaterial* mat,const IFC::IfcSurfaceStyle* surf,ConversionData& conv) 
{
	aiString name;
	name.Set((surf->Name? surf->Name.Get() : "IfcSurfaceStyle_Unnamed"));
	mat->AddProperty(&name,AI_MATKEY_NAME);

	// now see which kinds of surface information are present
	BOOST_FOREACH(boost::shared_ptr< const IFC::IfcSurfaceStyleElementSelect > sel2, surf->Styles) {
		if (const IFC::IfcSurfaceStyleShading* shade = sel2->ResolveSelectPtr<IFC::IfcSurfaceStyleShading>(conv.db)) {
			aiColor4D col_base,col;

			ConvertColor(col_base, shade->SurfaceColour);
			mat->AddProperty(&col_base,1, AI_MATKEY_COLOR_DIFFUSE);

			if (const IFC::IfcSurfaceStyleRendering* ren = shade->ToPtr<IFC::IfcSurfaceStyleRendering>()) {

				if (ren->Transparency) {
					const float t = 1.f-static_cast<float>(ren->Transparency.Get());
					mat->AddProperty(&t,1, AI_MATKEY_OPACITY);
				}

				if (ren->DiffuseColour) {
					ConvertColor(col, *ren->DiffuseColour.Get(),conv,&col_base);
					mat->AddProperty(&col,1, AI_MATKEY_COLOR_DIFFUSE);
				}

				if (ren->SpecularColour) {
					ConvertColor(col, *ren->SpecularColour.Get(),conv,&col_base);
					mat->AddProperty(&col,1, AI_MATKEY_COLOR_SPECULAR);
				}

				if (ren->TransmissionColour) {
					ConvertColor(col, *ren->TransmissionColour.Get(),conv,&col_base);
					mat->AddProperty(&col,1, AI_MATKEY_COLOR_TRANSPARENT);
				}

				if (ren->ReflectionColour) {
					ConvertColor(col, *ren->ReflectionColour.Get(),conv,&col_base);
					mat->AddProperty(&col,1, AI_MATKEY_COLOR_REFLECTIVE);
				}

				const int shading = (ren->SpecularHighlight && ren->SpecularColour)?ConvertShadingMode(ren->ReflectanceMethod):static_cast<int>(aiShadingMode_Gouraud);
				mat->AddProperty(&shading,1, AI_MATKEY_SHADING_MODEL);

				if (ren->SpecularHighlight) {
					if(const EXPRESS::REAL* rt = ren->SpecularHighlight.Get()->ToPtr<EXPRESS::REAL>()) {
						// at this point we don't distinguish between the two distinct ways of
						// specifying highlight intensities. leave this to the user.
						const float e = static_cast<float>(*rt);
						mat->AddProperty(&e,1,AI_MATKEY_SHININESS);
					}
					else {
						IFCImporter::LogWarn("unexpected type error, SpecularHighlight should be a REAL");
					}
				}
			}
		} /*
		else if (const IFC::IfcSurfaceStyleWithTextures* tex = sel2->ResolveSelectPtr<IFC::IfcSurfaceStyleWithTextures>(conv.db)) {
			// XXX
		} */
	}

}

// ------------------------------------------------------------------------------------------------
unsigned int ProcessMaterials(uint64_t id, unsigned int prevMatId, ConversionData& conv, bool forceDefaultMat)
{
	STEP::DB::RefMapRange range = conv.db.GetRefs().equal_range(id);
	for(;range.first != range.second; ++range.first) {
		if(const IFC::IfcStyledItem* const styled = conv.db.GetObject((*range.first).second)->ToPtr<IFC::IfcStyledItem>()) {
			BOOST_FOREACH(const IFC::IfcPresentationStyleAssignment& as, styled->Styles) {
				BOOST_FOREACH(boost::shared_ptr<const IFC::IfcPresentationStyleSelect> sel, as.Styles) {

					if( const IFC::IfcSurfaceStyle* const surf = sel->ResolveSelectPtr<IFC::IfcSurfaceStyle>(conv.db) ) {
						// try to satisfy from cache
						ConversionData::MaterialCache::iterator mit = conv.cached_materials.find(surf);
						if( mit != conv.cached_materials.end() )
							return mit->second;

						// not found, create new material
						const std::string side = static_cast<std::string>(surf->Side);
						if( side != "BOTH" ) {
							IFCImporter::LogWarn("ignoring surface side marker on IFC::IfcSurfaceStyle: " + side);
						}

						std::auto_ptr<aiMaterial> mat(new aiMaterial());

						FillMaterial(mat.get(), surf, conv);

						conv.materials.push_back(mat.release());
						unsigned int matindex = conv.materials.size() - 1;
						conv.cached_materials[surf] = matindex;
						return matindex;
			}
		}
	}
		}
	}

	// no local material defined. If there's global one, use that instead
	if( prevMatId != std::numeric_limits<uint32_t>::max() )
		return prevMatId;

	// we're still here - create an default material if required, or simply fail otherwise
	if( !forceDefaultMat )
		return std::numeric_limits<uint32_t>::max();

	aiString name;
	name.Set("<IFCDefault>");
	//  ConvertColorToString( color, name);

	// look if there's already a default material with this base color
	for( size_t a = 0; a < conv.materials.size(); ++a )
	{
		aiString mname;
		conv.materials[a]->Get(AI_MATKEY_NAME, mname);
		if( name == mname )
			return (unsigned int)a;
	}

	// we're here, yet - no default material with suitable color available. Generate one
	std::auto_ptr<aiMaterial> mat(new aiMaterial());
	mat->AddProperty(&name,AI_MATKEY_NAME);

	const aiColor4D col = aiColor4D( 0.6f, 0.6f, 0.6f, 1.0f); // aiColor4D( color.r, color.g, color.b, 1.0f);
	mat->AddProperty(&col,1, AI_MATKEY_COLOR_DIFFUSE);

	conv.materials.push_back(mat.release());
	return (unsigned int) conv.materials.size() - 1;
}

} // ! IFC
} // ! Assimp

#endif