diff options
Diffstat (limited to 'src/3rdparty/assimp/code/CalcTangentsProcess.cpp')
| -rw-r--r-- | src/3rdparty/assimp/code/CalcTangentsProcess.cpp | 54 |
1 files changed, 40 insertions, 14 deletions
diff --git a/src/3rdparty/assimp/code/CalcTangentsProcess.cpp b/src/3rdparty/assimp/code/CalcTangentsProcess.cpp index e7e00369e..20ed3ea52 100644 --- a/src/3rdparty/assimp/code/CalcTangentsProcess.cpp +++ b/src/3rdparty/assimp/code/CalcTangentsProcess.cpp @@ -55,8 +55,9 @@ using namespace Assimp; // ------------------------------------------------------------------------------------------------ // Constructor to be privately used by Importer CalcTangentsProcess::CalcTangentsProcess() -{ - this->configMaxAngle = AI_DEG_TO_RAD(45.f); +: configMaxAngle( AI_DEG_TO_RAD(45.f) ) +, configSourceUV( 0 ) { + // nothing to do here } // ------------------------------------------------------------------------------------------------ @@ -77,6 +78,8 @@ bool CalcTangentsProcess::IsActive( unsigned int pFlags) const // Executes the post processing step on the given imported data. void CalcTangentsProcess::SetupProperties(const Importer* pImp) { + ai_assert( NULL != pImp ); + // get the current value of the property configMaxAngle = pImp->GetPropertyFloat(AI_CONFIG_PP_CT_MAX_SMOOTHING_ANGLE,45.f); configMaxAngle = std::max(std::min(configMaxAngle,45.0f),0.0f); @@ -89,14 +92,20 @@ void CalcTangentsProcess::SetupProperties(const Importer* pImp) // Executes the post processing step on the given imported data. void CalcTangentsProcess::Execute( aiScene* pScene) { - DefaultLogger::get()->debug("CalcTangentsProcess begin"); + ai_assert( NULL != pScene ); + + DefaultLogger::get()->debug("CalcTangentsProcess begin"); bool bHas = false; - for( unsigned int a = 0; a < pScene->mNumMeshes; a++) + for ( unsigned int a = 0; a < pScene->mNumMeshes; a++ ) { if(ProcessMesh( pScene->mMeshes[a],a))bHas = true; + } - if (bHas)DefaultLogger::get()->info("CalcTangentsProcess finished. Tangents have been calculated"); - else DefaultLogger::get()->debug("CalcTangentsProcess finished"); + if ( bHas ) { + DefaultLogger::get()->info("CalcTangentsProcess finished. Tangents have been calculated"); + } else { + DefaultLogger::get()->debug("CalcTangentsProcess finished"); + } } // ------------------------------------------------------------------------------------------------ @@ -179,9 +188,14 @@ bool CalcTangentsProcess::ProcessMesh( aiMesh* pMesh, unsigned int meshIndex) float sx = meshTex[p1].x - meshTex[p0].x, sy = meshTex[p1].y - meshTex[p0].y; float tx = meshTex[p2].x - meshTex[p0].x, ty = meshTex[p2].y - meshTex[p0].y; float dirCorrection = (tx * sy - ty * sx) < 0.0f ? -1.0f : 1.0f; - - // tangent points in the direction where to positive X axis of the texture coords would point in model space - // bitangents points along the positive Y axis of the texture coords, respectively + // when t1, t2, t3 in same position in UV space, just use default UV direction. + if ( 0 == sx && 0 ==sy && 0 == tx && 0 == ty ) { + sx = 0.0; sy = 1.0; + tx = 1.0; ty = 0.0; + } + + // tangent points in the direction where to positive X axis of the texture coord's would point in model space + // bitangent's points along the positive Y axis of the texture coord's, respectively aiVector3D tangent, bitangent; tangent.x = (w.x * sy - v.x * ty) * dirCorrection; tangent.y = (w.y * sy - v.y * ty) * dirCorrection; @@ -191,8 +205,7 @@ bool CalcTangentsProcess::ProcessMesh( aiMesh* pMesh, unsigned int meshIndex) bitangent.z = (w.z * sx - v.z * tx) * dirCorrection; // store for every vertex of that face - for( unsigned int b = 0; b < face.mNumIndices; b++) - { + for( unsigned int b = 0; b < face.mNumIndices; ++b ) { unsigned int p = face.mIndices[b]; // project tangent and bitangent into the plane formed by the vertex' normal @@ -200,9 +213,22 @@ bool CalcTangentsProcess::ProcessMesh( aiMesh* pMesh, unsigned int meshIndex) aiVector3D localBitangent = bitangent - meshNorm[p] * (bitangent * meshNorm[p]); localTangent.Normalize(); localBitangent.Normalize(); - // and write it into the mesh. - meshTang[p] = localTangent; - meshBitang[p] = localBitangent; + // reconstruct tangent/bitangent according to normal and bitangent/tangent when it's infinite or NaN. + bool invalid_tangent = is_special_float(localTangent.x) || is_special_float(localTangent.y) || is_special_float(localTangent.z); + bool invalid_bitangent = is_special_float(localBitangent.x) || is_special_float(localBitangent.y) || is_special_float(localBitangent.z); + if (invalid_tangent != invalid_bitangent) { + if (invalid_tangent) { + localTangent = meshNorm[p] ^ localBitangent; + localTangent.Normalize(); + } else { + localBitangent = localTangent ^ meshNorm[p]; + localBitangent.Normalize(); + } + } + + // and write it into the mesh. + meshTang[ p ] = localTangent; + meshBitang[ p ] = localBitangent; } } |