void sb7fbxmodel::ProcessMesh(FbxNode* pNode)
{
fbxsdk::FbxMesh* pMesh = pNode->GetMesh();
if(pMesh == NULL)
{
return;
}
int triangleCount = pMesh->GetPolygonCount();
int vertexCounter = 0;
sub_mesh sm;
sm.count = 3 * triangleCount;
sm.va = (vetex_attr*)malloc(sizeof(vetex_attr) * sm.count);
m_vass.push_back(sm);
for(int i = 0 ; i < triangleCount ; ++i)
{
for(int j = 0 ; j < 3 ; j++)
{
vetex_attr va;
int ctrlPointIndex = pMesh->GetPolygonVertex(i , j);
// Read the vertex
ReadVertex(pMesh , ctrlPointIndex , va.vertex);
// Read the color of each vertex
ReadColor(pMesh , ctrlPointIndex , vertexCounter , va.color);
// Read the UV of each vertex
for(int k = 0 ; k < 2 ; ++k)
{
ReadUV(pMesh , ctrlPointIndex , pMesh->GetTextureUVIndex(i, j) , k , va.uv[k]);
}
// Read the normal of each vertex
ReadNormal(pMesh , ctrlPointIndex , vertexCounter , va.normal);
// Read the tangent of each vertex
ReadTangent(pMesh , ctrlPointIndex , vertexCounter , va.tangent);
sm.va[vertexCounter] = va;
vertexCounter++;
}
// 根据读入的信息组装三角形，并以某种方式使用即可，比如存入到列表中、保存到文件等...
}
}
void FbxLoader::ProcessMesh(FbxNode* node, Node& meshNode)
{
FbxMesh* currMesh = node->GetMesh();
if(!currMesh)
return;
FbxLayerElementTangent* tangents = nullptr;
if(useNormalMap) {
if(currMesh->GetElementTangentCount() < 1) {
currMesh->GenerateTangentsDataForAllUVSets();
tangents = currMesh->GetElementTangent();
}
}
std::map<int, std::vector<Vertex>> subMeshes;
int vertCounter = 0;
const int polygonCount = currMesh->GetPolygonCount();
for(int i = 0; i < polygonCount; i++) {
const int polySize = currMesh->GetPolygonSize(i);
int nMaterials = node->GetMaterialCount();
auto elementMaterial = currMesh->GetElementMaterial();
int mi = 0;
if(elementMaterial)
mi = currMesh->GetElementMaterial()->GetIndexArray()[i];
for(int j = 2; j >= 0; --j) {
int ctrlIndex = currMesh->GetPolygonVertex(i, j);
auto& currCtrlPoint = meshNode.controlPoints[ctrlIndex];
FbxVector4 v4;
auto& pos = currCtrlPoint.position * factor;
currMesh->GetPolygonVertexNormal(i, j, v4);
Vector3 normal = { (float)v4[0], (float)v4[1], (float)v4[2] };
Vector3 tangent = { 0, 0, 0 };
if(useNormalMap) {
ReadTangent(tangents, ctrlIndex, vertCounter, v4);
tangent = { (float)v4[0], (float)v4[1], (float)v4[2] };
}
Vector2 uv;
FbxStringList uvSetNames;
currMesh->GetUVSetNames(uvSetNames);
bool unmapped = false;
// supports one uv set only
if(uvSetNames.GetCount() > 0) {
FbxVector2 UV;
currMesh->GetPolygonVertexUV(i, j, uvSetNames[0], UV, unmapped);
uv = { (float)UV[0], (float)UV[1] };
}
if(axismode == eLeftHanded) {
pos.x *= -1; uv.y = 1 - uv.y;
normal.x *= -1; tangent.x *= -1;
}
Vector4 weights = { 0, 0, 0, 0 };
Byte4 indices = { 0, 0, 0, 0 };
int blendCount = (int)min(currCtrlPoint.blendWeigths.size(), 4);
if(blendCount > 0) {
meshNode.useSkinnedMesh = true;
if(currCtrlPoint.blendWeigths.size() > 4)
sort(currCtrlPoint.blendWeigths.begin(), currCtrlPoint.blendWeigths.end());
for(int i = 0; i < blendCount; i++) {
weights[i] = currCtrlPoint.blendWeigths[i].weight;
indices.m[i] = currCtrlPoint.blendWeigths[i].boneIndex;
}
}
Vertex temp = { pos, uv, normal, tangent, indices, weights };
subMeshes[mi].push_back(temp);
}
++vertCounter;
}
if(subMeshes.size() > 0) {
int index = 0;
meshNode.meshes.reserve(vertCounter);
meshNode.vertIndices.reserve(vertCounter);
meshNode.vertexCountOfSubMesh.reserve(subMeshes.size());
for(auto& pair : subMeshes) {
auto& m = pair.second;
for(int i = 0; i < m.size(); ++i)
meshNode.vertIndices.emplace_back(index++);
meshNode.vertexCountOfSubMesh.push_back((int)m.size());
meshNode.meshes.insert(meshNode.meshes.end(), m.begin(), m.end());
}
}
subMeshes.clear();
}
