static void ReadMeshElements(MeshData data, ImportOptions importOptions, ref Matrix4 transform)
{
ReadUvSets(data);
//flip with disabled FlipUVs, no flip when enabled
if (!importOptions.ImportPostProcessFlags.HasFlag(ImportPostProcessFlags.FlipUVs))
{
CalcMiscProcess.FlipUVs(data.Vertices, data.VertexComponents);
//ToDo : !!! Доделать FlipUV для Materials - там тоже Flip для Transform текстуры .... tex->UVScaling(); tex->UVTranslation();
}
ReadColor(data);
TransformVertices(data, transform);
int uvSetIndexForNormalsAndTangents = 0; //ToDo : пока 0, может не всегда?
if (3 <= data.PolygonSize)
{
ReadNormals(data, importOptions, uvSetIndexForNormalsAndTangents, data.CalcCache, ref transform);
if (importOptions.ImportPostProcessFlags.HasFlag(ImportPostProcessFlags.FixInfacingNormals) && data.NormalsSource != TangentsAndNormalsSource.None)
{
if (CalcNormalsProcess.FixInfacingNormals(data.Vertices))
{
FbxImportLog.LogMessage(data.Node, "Infacing Normals Fixed");
}
}
ReadTangents(data, importOptions, uvSetIndexForNormalsAndTangents, data.CalcCache, ref transform);
}
}
public static MeshData[] ProcMesh(FbxManager manager, FbxNode node, FbxMesh mesh, ImportOptions importOptions, Matrix4 additionalTransform)
{
var transform = additionalTransform * FbxMath.EvaluateGlobalTransform(node).ToMatrix4();
transform = transform * FbxMath.GetGeometryOffset(node).ToMatrix4();
var converter = new FbxGeometryConverter(manager);
bool success = false;
try
{
mesh = FbxMesh.Cast(converter.Triangulate(mesh, false)); //ToDo :? Может true? Чтобы не создавать второй mesh в Attribute
success = true;
}
catch (Exception ex)
{
FbxImportLog.LogError(node, "Inside Triangulate error: " + ex);
}
if (!success || mesh == null)
{
return(null);
}
MeshData data = ReadTriangles(mesh, node);
var ret = ReadMaterialsAndSplitByMaterials(data);
foreach (var m in ret)
{
ReadMeshElements(m, importOptions, ref transform);
}
return(ret);
}
// key - control point index
public static Dictionary <int, BoneAssignment> GetBoneAssignments(FbxMesh mesh, Skeleton skeleton)
{
var boneAssignments = new Dictionary <int, BoneAssignment>();
var weightLists = new Dictionary <int, List <(int, double)> >();
int skinCount = mesh.GetDeformerCount(FbxDeformer.EDeformerType.eSkin);
if (skinCount == 0)
{
return(null);
}
if (1 < skinCount)
{
FbxImportLog.LogMessage(mesh.GetNode(), "Warning! Multiple skins for the mesh"); //??? Может ли быть в одном Mesh несколько Skins? Скорее всего нет, хоть API позволяет.
}
FbxSkin pSkin = FbxSkin.Cast(mesh.GetDeformer(0, FbxDeformer.EDeformerType.eSkin));
int clusterCount = pSkin.GetClusterCount();
for (int iCluster = 0; iCluster < clusterCount; iCluster++)
{
FbxCluster pCluster = pSkin.GetCluster(iCluster);
FbxNode pLink = pCluster.GetLink();
if (pLink == null)
{
continue;
}
int weightCount = pCluster.GetControlPointIndicesCount();
if (weightCount == 0)
{
continue;
}
int boneIndex = skeleton.GetBoneIndexByNode(pLink);
var weightIndices = IntArray.frompointer(pCluster.GetControlPointIndices());
var weightValues = DoubleArray.frompointer(pCluster.GetControlPointWeights());
for (int i = 0; i < weightCount; i++)
{
int vertexIndex = weightIndices.getitem(i);
double weight = weightValues.getitem(i);
if (!weightLists.TryGetValue(vertexIndex, out var lst))
{
lst = new List <(int, double)>();
weightLists[vertexIndex] = lst;
}
lst.Add((boneIndex, weight));
}
}
foreach (var pair in weightLists)
{
boneAssignments[pair.Key] = ConvertBoneWeightListToBoneAssignment(pair.Value);
}
return(boneAssignments);
}
//Find the cluster that links to the skeleton bone node
public static FbxCluster FindCluster(FbxNode boneNode, FbxSkin[] skins, out FbxSkin skin)
{
for (int i = 0; i < skins.Length; i++)
{
skin = skins[i];
int nClusterCount = skin.GetClusterCount();
for (int j = 0; j < nClusterCount; j++)
{
FbxCluster fbxCluster = skin.GetCluster(j);
if (fbxCluster == null)
{
continue;
}
if (fbxCluster.GetLinkMode() == FbxCluster.ELinkMode.eAdditive && fbxCluster.GetAssociateModel() != null)
{
FbxImportLog.LogMessage(boneNode, "Warning! Associated model.");
}
if (fbxCluster.GetLink()?.GetUniqueID() == boneNode.GetUniqueID())
{
return(fbxCluster);
}
}
}
skin = null;
return(null);
}
// Compute per-face normals but store them per-vertex
static void CalculateNormalForFace(VertexInfo[] vertices, RangeI indexRange, bool normalize)
{
if (indexRange.Size < 3)
{
for (int i = indexRange.Minimum; i < indexRange.Maximum; i++)
{
vertices[i].Vertex.Normal = new Vector3F(Single.NaN, Single.NaN, Single.NaN);
}
FbxImportLog.LogWarning("To calculate the tangents a polygon must have > 2 vertices");
}
ref Vector3F p0 = ref vertices[indexRange.Minimum].Vertex.Position;
static void CalculateTangentForFace(VertexInfo[] vertices, RangeI indexRange, Vector3F[] tangents, Vector3F[] bitangents, GetTextureCoord getTextureCoord = null)
{
// triangle or polygon... we always use only the first three indices. A polygon
// is supposed to be planar anyways....
if (indexRange.Size < 3)
{
for (int i = indexRange.Minimum; i < indexRange.Maximum; i++)
{
tangents[i] = new Vector3F(float.NaN, float.NaN, float.NaN);
bitangents[i] = new Vector3F(float.NaN, float.NaN, float.NaN);
}
FbxImportLog.LogWarning("To calculate the tangents a polygon must have > 2 vertices");
return;
}
ref StandardVertex pt0 = ref vertices[indexRange.Minimum].Vertex;
static void ReadColor(MeshData data)
{
FbxLayerElementVertexColor pVertexColors = data.Mesh.GetElementVertexColor();
if (pVertexColors == null)
{
for (int i = 0; i < data.Vertices.Length; i++)
{
data.Vertices[i].Vertex.Color = new ColorValue(1, 1, 1);
}
return;
}
var mappingMode = pVertexColors.GetMappingMode();
if (!CheckPolygonVertexOrControlPoint(mappingMode))
{
FbxImportLog.LogWarning(data.Node, $"has unsupported VertexColors mapping mode: {pVertexColors.GetMappingMode()}");
return;
}
data.VertexComponents |= StandardVertex.Components.Color;
var indexArray = pVertexColors.GetReferenceMode() != FbxLayerElement.EReferenceMode.eDirect ? pVertexColors.GetIndexArray() : null;
var directArray = pVertexColors.GetDirectArray();
for (int i = 0; i < data.Vertices.Length; i++)
{
ref VertexInfo vertex = ref data.Vertices[i];
FbxColor color = null;
switch (pVertexColors.GetMappingMode())
{
case FbxLayerElement.EMappingMode.eByPolygonVertex:
color = directArray.GetAt(indexArray?.GetAt(vertex.PolygonVertexIndex) ?? vertex.PolygonVertexIndex);
break;
case FbxLayerElement.EMappingMode.eByControlPoint:
color = directArray.GetAt(indexArray?.GetAt(vertex.ControlPointIndex) ?? vertex.ControlPointIndex);
break;
}
data.Vertices[i].Vertex.Color = color?.ToColorValue() ?? new ColorValue(1, 1, 1);
}
//Calculates global transform of the node.
//This function was taken from FBX SDK/Smaples/Transformations. Originaly it did not take into account AxisSystem, so the corrections to use AxisSystem was added.
//Has the fbx sdk equivalent pNode.EvaluateGlobalTransform();
//
//Note: FBX Documentation for ConvertScene states - "The adjustment will affect the translation animation curves and the objects pivots values
//(the rotation transformation is applied as a pre-rotation transform therefore the rotation animation curves do not need to be transformed)"
//But ConvertScene, does not realy change node.PreRotation, these changes are in the matrix : node.GetScene().GetGlobalSettings().GetAxisSystem().GetMatrix
//
/*
* Terminology:
* Suffix "M" means this is a matrix, suffix "V" means it is a vector.
* T is translation.
* R is rotation.
* S is scaling.
* SH is shear.
* GlobalRM(x) means the Global Rotation Matrix of node "x".
* GlobalRM(P(x)) means the Global Rotation Matrix of the parent node of node "x".
* All other transforms are described in the similar way.
*
* The algorithm description:
* To calculate global transform of a node x according to different InheritType,
* we need to calculate GlobalTM(x) and [GlobalRM(x) * (GlobalSHM(x) * GlobalSM(x))] separately.
* GlobalM(x) = GlobalTM(x) * [GlobalRM(x) * (GlobalSHM(x) * GlobalSM(x))];
*
* InhereitType = RrSs:
* GlobalRM(x) * (GlobalSHM(x) * GlobalSM(x)) = GlobalRM(P(x)) * LocalRM(x) * [GlobalSHM(P(x)) * GlobalSM(P(x))] * LocalSM(x);
*
* InhereitType = RSrs:
* GlobalRM(x) * (GlobalSHM(x) * GlobalSM(x)) = GlobalRM(P(x)) * [GlobalSHM(P(x)) * GlobalSM(P(x))] * LocalRM(x) * LocalSM(x);
*
* InhereitType = Rrs:
* GlobalRM(x) * (GlobalSHM(x) * GlobalSM(x)) = GlobalRM(P(x)) * LocalRM(x) * LocalSM(x);
*
* LocalM(x)= TM(x) * RoffsetM(x) * RpivotM(x) * RpreM(x) * RM(x) * RpostM(x) * RpivotM(x)^-1 * SoffsetM(x) *SpivotM(x) * SM(x) * SpivotM(x)^-1
* LocalTWithAllPivotAndOffsetInformationV(x) = Local(x).GetT();
* GlobalTV(x) = GlobalM(P(x)) * LocalTWithAllPivotAndOffsetInformationV(x);
*
* Notice: FBX SDK does not support shear yet, so all local transform won't have shear.
* However, global transform might bring in shear by combine the global transform of node in higher hierarchy.
* For example, if you scale the parent by a non-uniform scale and then rotate the child node, then a shear will
* be generated on the child node's global transform.
* In this case, we always compensates shear and store it in the scale matrix too according to following formula:
* Shear*Scaling = RotationMatrix.Inverse * TranslationMatrix.Inverse * WholeTranformMatrix
*/
// ReSharper disable InconsistentNaming
static FbxAMatrix CalculateGlobalTransform(FbxNode node)
{
if (node == null)
{
var ret = new FbxAMatrix();
ret.SetIdentity();
return(ret);
}
var lTranlationM = new FbxAMatrix();
var lScalingM = new FbxAMatrix();
var lScalingPivotM = new FbxAMatrix();
var lScalingOffsetM = new FbxAMatrix();
var lRotationOffsetM = new FbxAMatrix();
var lRotationPivotM = new FbxAMatrix();
var lPreRotationM = new FbxAMatrix();
var lRotationM = new FbxAMatrix();
var lPostRotationM = new FbxAMatrix();
FbxAMatrix lParentGX = new FbxAMatrix();
FbxAMatrix lGlobalT = new FbxAMatrix();
FbxAMatrix lGlobalRS = new FbxAMatrix();
// Construct translation matrix
FbxVector4 lTranslation = new FbxVector4(node.LclTranslation.Get()); //The fourth component of this object is assigned 1.
lTranlationM.SetT(lTranslation);
// Construct rotation matrices
FbxVector4 lRotation = new FbxVector4(node.LclRotation.Get());
FbxVector4 lPreRotation = new FbxVector4(node.PreRotation.Get());
FbxVector4 lPostRotation = new FbxVector4(node.PostRotation.Get());
lRotationM.SetR(lRotation);
lPreRotationM.SetR(lPreRotation);
lPostRotationM.SetR(lPostRotation);
// Construct scaling matrix
FbxVector4 lScaling = new FbxVector4(node.LclScaling.Get());
lScalingM.SetS(lScaling);
// Construct offset and pivot matrices
FbxVector4 lScalingOffset = new FbxVector4(node.ScalingOffset.Get());
FbxVector4 lScalingPivot = new FbxVector4(node.ScalingPivot.Get());
FbxVector4 lRotationOffset = new FbxVector4(node.RotationOffset.Get());
FbxVector4 lRotationPivot = new FbxVector4(node.RotationPivot.Get());
lScalingOffsetM.SetT(lScalingOffset);
lScalingPivotM.SetT(lScalingPivot);
lRotationOffsetM.SetT(lRotationOffset);
lRotationPivotM.SetT(lRotationPivot);
// Calculate the global transform matrix of the parent node
FbxNode lParentNode = node.GetParent();
if (lParentNode != null)
{
//Children of the root node must take into account the axis matrix.
//Warning: this function CalculateGlobalTransform was taken from FBX SDK/Smaples/Transformations. Originaly it did not take into account AxisSystem
if (lParentNode.GetParent() == null)
{
FbxAMatrix axisMarix = new FbxAMatrix();
node.GetScene().GetGlobalSettings().GetAxisSystem().GetMatrix(axisMarix);
lPreRotationM = axisMarix.mul(lPreRotationM);
}
lParentGX = CalculateGlobalTransform(lParentNode);
}
else
{
lParentGX.SetIdentity();
}
//Construct Global Rotation
FbxAMatrix lParentGRM = new FbxAMatrix();
FbxVector4 lParentGR = lParentGX.GetR();
lParentGRM.SetR(lParentGR);
var lLRM = lPreRotationM.mul(lRotationM).mul(lPostRotationM);
//Construct Global Shear*Scaling
//FBX SDK does not support shear, to patch this, we use:
//Shear*Scaling = RotationMatrix.Inverse * TranslationMatrix.Inverse * WholeTranformMatrix
FbxAMatrix lParentTM = new FbxAMatrix();
FbxVector4 lParentGT = lParentGX.GetT();
lParentTM.SetT(lParentGT);
var lParentGRSM = lParentTM.Inverse().mul(lParentGX);
var lParentGSM = lParentGRM.Inverse().mul(lParentGRSM);
var lLSM = lScalingM;
//Do not consider translation now
FbxTransform.EInheritType lInheritType = node.InheritType.Get();
if (lInheritType == FbxTransform.EInheritType.eInheritRrSs)
{
lGlobalRS = lParentGRM.mul(lLRM).mul(lParentGSM).mul(lLSM);
}
else if (lInheritType == FbxTransform.EInheritType.eInheritRSrs)
{
lGlobalRS = lParentGRM.mul(lParentGSM).mul(lLRM).mul(lLSM);
}
else if (lInheritType == FbxTransform.EInheritType.eInheritRrs)
{
if (lParentNode != null)
{
FbxAMatrix lParentLSM = new FbxAMatrix();
FbxVector4 lParentLS = new FbxVector4(lParentNode.LclScaling.Get());
lParentLSM.SetS(lParentLS);
FbxAMatrix lParentGSM_noLocal = lParentGSM.mul(lParentLSM.Inverse());
lGlobalRS = lParentGRM.mul(lLRM).mul(lParentGSM_noLocal).mul(lLSM);
}
else
{
lGlobalRS = lParentGRM.mul(lLRM).mul(lLSM);
}
}
else
{
FbxImportLog.LogError(node, "error, unknown inherit type!");
}
// Construct translation matrix
// Calculate the local transform matrix
var lTransform = lTranlationM.mul(lRotationOffsetM).mul(lRotationPivotM).mul(lPreRotationM).mul(lRotationM).mul(lPostRotationM)
.mul(lRotationPivotM.Inverse()).mul(lScalingOffsetM).mul(lScalingPivotM).mul(lScalingM).mul(lScalingPivotM.Inverse());
FbxVector4 lLocalTWithAllPivotAndOffsetInfo = lTransform.GetT();
// Calculate global translation vector according to:
// GlobalTranslation = ParentGlobalTransform * LocalTranslationWithPivotAndOffsetInfo
FbxVector4 lGlobalTranslation = lParentGX.MultT(lLocalTWithAllPivotAndOffsetInfo);
lGlobalT.SetT(lGlobalTranslation);
//Construct the whole global transform
lTransform = lGlobalT.mul(lGlobalRS);
return(lTransform);
}
