/**
* Process and update the vertex Influences using the raw binary import data
*
* @param ImportData - raw binary import data to process
*/
void ProcessImportMeshInfluences(FSkeletalMeshImportData& ImportData)
{
TArray <FVector>& Points = ImportData.Points;
TArray <VVertex>& Wedges = ImportData.Wedges;
TArray <VRawBoneInfluence>& Influences = ImportData.Influences;
// Sort influences by vertex index.
struct FCompareVertexIndex
{
bool operator()( const VRawBoneInfluence& A, const VRawBoneInfluence& B ) const
{
if ( A.VertexIndex > B.VertexIndex ) return false;
else if ( A.VertexIndex < B.VertexIndex ) return true;
else if ( A.Weight < B.Weight ) return false;
else if ( A.Weight > B.Weight ) return true;
else if ( A.BoneIndex > B.BoneIndex ) return false;
else if ( A.BoneIndex < B.BoneIndex ) return true;
else return false;
}
};
Influences.Sort( FCompareVertexIndex() );
// Remove more than allowed number of weights by removing least important influences (setting them to 0).
// Relies on influences sorted by vertex index and weight and the code actually removing the influences below.
int32 LastVertexIndex = INDEX_NONE;
int32 InfluenceCount = 0;
for( int32 i=0; i<Influences.Num(); i++ )
{
if( ( LastVertexIndex != Influences[i].VertexIndex ) )
{
InfluenceCount = 0;
LastVertexIndex = Influences[i].VertexIndex;
}
InfluenceCount++;
if( InfluenceCount > MAX_TOTAL_INFLUENCES || LastVertexIndex >= Points.Num() )
{
Influences[i].Weight = 0.f;
}
}
// Remove influences below a certain threshold.
int32 RemovedInfluences = 0;
const float MINWEIGHT = 0.01f; // 1%
for( int32 i=Influences.Num()-1; i>=0; i-- )
{
if( Influences[i].Weight < MINWEIGHT )
{
Influences.RemoveAt(i);
RemovedInfluences++;
}
}
// Renormalize influence weights.
int32 LastInfluenceCount = 0;
InfluenceCount = 0;
LastVertexIndex = INDEX_NONE;
float TotalWeight = 0.f;
for( int32 i=0; i<Influences.Num(); i++ )
{
if( LastVertexIndex != Influences[i].VertexIndex )
{
LastInfluenceCount = InfluenceCount;
InfluenceCount = 0;
// Normalize the last set of influences.
if( LastInfluenceCount && (TotalWeight != 1.0f) )
{
float OneOverTotalWeight = 1.f / TotalWeight;
for( int r=0; r<LastInfluenceCount; r++)
{
Influences[i-r-1].Weight *= OneOverTotalWeight;
}
}
TotalWeight = 0.f;
LastVertexIndex = Influences[i].VertexIndex;
}
InfluenceCount++;
TotalWeight += Influences[i].Weight;
}
// Ensure that each vertex has at least one influence as e.g. CreateSkinningStream relies on it.
// The below code relies on influences being sorted by vertex index.
LastVertexIndex = -1;
InfluenceCount = 0;
if( Influences.Num() == 0 )
{
UnFbx::FFbxImporter* FFbxImporter = UnFbx::FFbxImporter::GetInstance();
// warn about no influences
FFbxImporter->AddTokenizedErrorMessage(FTokenizedMessage::Create(EMessageSeverity::Warning, LOCTEXT("WarningNoSkelInfluences", "Warning skeletal mesh is has no vertex influences")));
// add one for each wedge entry
Influences.AddUninitialized(Wedges.Num());
for( int32 WedgeIdx=0; WedgeIdx<Wedges.Num(); WedgeIdx++ )
{
Influences[WedgeIdx].VertexIndex = WedgeIdx;
Influences[WedgeIdx].BoneIndex = 0;
Influences[WedgeIdx].Weight = 1.0f;
}
}
for( int32 i=0; i<Influences.Num(); i++ )
{
int32 CurrentVertexIndex = Influences[i].VertexIndex;
if( LastVertexIndex != CurrentVertexIndex )
{
for( int32 j=LastVertexIndex+1; j<CurrentVertexIndex; j++ )
{
// Add a 0-bone weight if none other present (known to happen with certain MAX skeletal setups).
Influences.InsertUninitialized(i,1);
Influences[i].VertexIndex = j;
Influences[i].BoneIndex = 0;
Influences[i].Weight = 1.f;
}
LastVertexIndex = CurrentVertexIndex;
}
}
}
/**
* Process and update the vertex Influences using the raw binary import data
*
* @param ImportData - raw binary import data to process
*/
void ProcessImportMeshInfluences(FSkeletalMeshImportData& ImportData)
{
TArray <FVector>& Points = ImportData.Points;
TArray <VVertex>& Wedges = ImportData.Wedges;
TArray <VRawBoneInfluence>& Influences = ImportData.Influences;
// Sort influences by vertex index.
struct FCompareVertexIndex
{
bool operator()( const VRawBoneInfluence& A, const VRawBoneInfluence& B ) const
{
if ( A.VertexIndex > B.VertexIndex ) return false;
else if ( A.VertexIndex < B.VertexIndex ) return true;
else if ( A.Weight < B.Weight ) return false;
else if ( A.Weight > B.Weight ) return true;
else if ( A.BoneIndex > B.BoneIndex ) return false;
else if ( A.BoneIndex < B.BoneIndex ) return true;
else return false;
}
};
Influences.Sort( FCompareVertexIndex() );
TArray <VRawBoneInfluence> NewInfluences;
int32 LastNewInfluenceIndex=0;
int32 LastVertexIndex = INDEX_NONE;
int32 InfluenceCount = 0;
float TotalWeight = 0.f;
const float MINWEIGHT = 0.01f;
for( int32 i=0; i<Influences.Num(); i++ )
{
// we found next verts, normalize it now
if (LastVertexIndex != Influences[i].VertexIndex )
{
// Normalize the last set of influences.
if (InfluenceCount && (TotalWeight != 1.0f))
{
float OneOverTotalWeight = 1.f / TotalWeight;
for (int r = 0; r < InfluenceCount; r++)
{
NewInfluences[LastNewInfluenceIndex - r].Weight *= OneOverTotalWeight;
}
}
// now we insert missing verts
if (LastVertexIndex != INDEX_NONE)
{
int32 CurrentVertexIndex = Influences[i].VertexIndex;
for(int32 j=LastVertexIndex+1; j<CurrentVertexIndex; j++)
{
// Add a 0-bone weight if none other present (known to happen with certain MAX skeletal setups).
LastNewInfluenceIndex = NewInfluences.AddUninitialized();
NewInfluences[LastNewInfluenceIndex].VertexIndex = j;
NewInfluences[LastNewInfluenceIndex].BoneIndex = 0;
NewInfluences[LastNewInfluenceIndex].Weight = 1.f;
}
}
// clear to count next one
InfluenceCount = 0;
TotalWeight = 0.f;
LastVertexIndex = Influences[i].VertexIndex;
}
// if less than min weight, or it's more than 8, then we clear it to use weight
if (Influences[i].Weight > MINWEIGHT && InfluenceCount < MAX_TOTAL_INFLUENCES)
{
LastNewInfluenceIndex = NewInfluences.Add(Influences[i]);
InfluenceCount++;
TotalWeight += Influences[i].Weight;
}
}
Influences = NewInfluences;
// Ensure that each vertex has at least one influence as e.g. CreateSkinningStream relies on it.
// The below code relies on influences being sorted by vertex index.
if( Influences.Num() == 0 )
{
UnFbx::FFbxImporter* FFbxImporter = UnFbx::FFbxImporter::GetInstance();
// warn about no influences
FFbxImporter->AddTokenizedErrorMessage(FTokenizedMessage::Create(EMessageSeverity::Warning, LOCTEXT("WarningNoSkelInfluences", "Warning skeletal mesh is has no vertex influences")), FFbxErrors::SkeletalMesh_NoInfluences);
// add one for each wedge entry
Influences.AddUninitialized(Wedges.Num());
for( int32 WedgeIdx=0; WedgeIdx<Wedges.Num(); WedgeIdx++ )
{
Influences[WedgeIdx].VertexIndex = WedgeIdx;
Influences[WedgeIdx].BoneIndex = 0;
Influences[WedgeIdx].Weight = 1.0f;
}
for(int32 i=0; i<Influences.Num(); i++)
{
int32 CurrentVertexIndex = Influences[i].VertexIndex;
if(LastVertexIndex != CurrentVertexIndex)
{
for(int32 j=LastVertexIndex+1; j<CurrentVertexIndex; j++)
{
// Add a 0-bone weight if none other present (known to happen with certain MAX skeletal setups).
Influences.InsertUninitialized(i, 1);
Influences[i].VertexIndex = j;
Influences[i].BoneIndex = 0;
Influences[i].Weight = 1.f;
}
LastVertexIndex = CurrentVertexIndex;
}
}
}
}