float4x4 Curve::GetAngle(float t) {
// Get direction at point t
float3 x = GetTangent(t);
float3 y = Utils::GramSchmidt2(x,float3(0,1,0));
y.Normalize();
float3 z = Utils::GramSchmidt3(x,y,float3(0,0,1));
z.Normalize();
// Create I matrix
float4x4 result;
result.Identity();
// Compute rotation matrix for Y = A(result)
result._11 = x.x;
result._12 = x.y;
result._13 = x.z;
result._21 = y.x;
result._22 = y.y;
result._23 = y.z;
result._31 = z.x;
result._32 = z.y;
result._33 = z.z;
// Flip or swap one if determinant = -1...
if(Utils::fequals(result.Determinant(),-1)) { // lame epsilon trick
result._31 = -z.x;
result._32 = -z.y;
result._33 = -z.z;
}
return result;
}
void csTerrainCell::RecalculateTangentData ()
{
if (!needTangentsUpdate) return;
needTangentsUpdate = false;
tangentmap.SetSize (gridWidth * gridHeight);
bitangentmap.SetSize (gridWidth * gridHeight);
csVector3* tData = tangentmap.GetArray ();
csVector3* bData = bitangentmap.GetArray ();
for (int y = 0; y < gridWidth; ++y)
{
csVector3* tRow = tData + y * gridHeight;
csVector3* bRow = bData + y * gridHeight;
for (int x = 0; x < gridHeight; ++x)
{
*tRow++ = GetTangent (x, y);
*bRow++ = GetBinormal (x, y);
}
}
}
void FBXScene::ProcessMesh(FbxNode* pNode)
{
FbxMesh* pFBXMesh = pNode->GetMesh();
if( !pFBXMesh )
return;
if ( pFBXMesh->GetPolygonVertexCount() != pFBXMesh->GetPolygonCount() * 3 )
{
FbxGeometryConverter GeometryConverter(pNode->GetFbxManager());
if( !GeometryConverter.TriangulateInPlace( pNode ) )
{
return;
}
pFBXMesh = pNode->GetMesh();
}
pFBXMesh->InitNormals();
pFBXMesh->ComputeVertexNormals(true);
pFBXMesh->GenerateTangentsDataForAllUVSets();
int nVertexCount = pFBXMesh->GetControlPointsCount();
if( nVertexCount <= 0 )
return;
std::vector<BoneWeights> boneWeights(nVertexCount);
ProcessBoneWeights(pFBXMesh, boneWeights);
Model* pModel = new Model(pNode->GetName(), m_Models.GetCount(), false);
FbxVector4* aControlPoints = pFBXMesh->GetControlPoints();
for( int pi = 0; pi < pFBXMesh->GetPolygonCount(); ++pi ) // Whole for-loop takes some time too, investigate further.
{
// Material
Material* pMaterial = NULL;
for( unsigned int pvi = 0; pvi < 3; ++pvi )
{
int nVertexIndex = pFBXMesh->GetPolygonVertex(pi, pvi);
if( nVertexIndex < 0 || nVertexIndex >= nVertexCount )
continue;
// Material
if( pMaterial == NULL )
pMaterial = GetMaterialLinkedWithPolygon(pFBXMesh, 0, pi, 0, nVertexIndex);
// Position
FbxVector4 fbxPosition = aControlPoints[nVertexIndex];
// Normals And Tangents
FbxVector4 fbxNormal, fbxTangent;
fbxNormal = GetNormal(pFBXMesh, 0, pi, pvi, nVertexIndex);
fbxTangent = GetTangent(pFBXMesh, 0, pi, pvi, nVertexIndex);
// Add Vertex
pModel->AddVertex(pMaterial, FbxVector4ToBTHFBX_VEC3(fbxPosition),
FbxVector4ToBTHFBX_VEC3(fbxNormal),
FbxVector4ToBTHFBX_VEC3(fbxTangent),
GetTexCoord(pFBXMesh, 0, pi, pvi, nVertexIndex),
boneWeights[nVertexIndex]);
// Update Bounding Box
UpdateBoundingBoxDataFromVertex(FbxVector4ToBTHFBX_VEC3(fbxPosition));
}
}
// Geometric Offset
pModel->SetGeometricOffset2(GetGeometricOffset2(pNode));
// Insert Model
m_Models.Add(pModel->GetName(), pModel);
}
