目的是为OSG做自定义的导出插件. 记录取得数据的方法.

Max在代码中会提供一个INode对象. 从这个对象里取出各种数据. getSkin这个函数取出了ISkin修改器 下面这个函数一样是用于学习, 把数据输出到文本文件

`

ISkin* OSGExp::getSkin(INode *pINode)
{// get the object reference of the nodeObject *pObject;pObject = pINode->GetObjectRef();if (pObject == 0) return 0;// loop through all derived objectsObjectState _objectState = pINode->EvalWorldState(_ip->GetTime());// Arcadia 2018-09-10if (_objectState.obj->SuperClassID() == GEOMOBJECT_CLASS_ID)// Arcadia 2018-09-10 有顶点数据,才会有蒙皮{IDerivedObject *pDerivedObject;pDerivedObject = static_cast<IDerivedObject *>(pObject);// loop through all modifiers 遍历所有的修改器int stackId;Modifier *pModifier;// 这里用于存放当前修改器, 用于试着转成蒙皮ISkin* _skin = NULL;for (stackId = 0; stackId < pDerivedObject->NumModifiers(); stackId++){_skin = NULL;// get the modifierif (NULL == pDerivedObject->GetModifier(stackId)){continue;}// 蒙皮在Max中是个修改器, 取得这个修改器,再转成_skinpModifier = pDerivedObject->GetModifier(stackId);// Arcadia 2018-09-10if (pModifier){char _sTemp[255];// 蒙皮数据的上下文:_skin = dynamic_cast<ISkin*>(pModifier);if (_skin){}// END if(_skin)}}return _skin;}return 0;
}

`

函数readSkinData解析蒙皮数据 在Max导出插件制作过程中, 用写文件的方式调试比较方便 每个顶点对应几个有作用的骨骼, GetNumAssignedBones 取得有作用的骨骼 然后再遍历取得这个顶点的各个权重值. 并遍历取得相关骨骼的序号.

这里要注意的一点是, 所有骨骼是一个数组, 单个顶点的作用骨骼又是另一数组, 用单个顶点作用骨骼的下标可以取得骨骼于[所有骨骼数组]的下标.

` /** * 读取蒙皮数据, 输出到文件, 用于调试与学习 */ void OSGExp::readSkinData(ISkin skin,INode node) { using std::sprintf; string labelStart("\n S S S S S S S S S S S S\n"); m_FileObj.write(labelStart.c_str(), labelStart.size());

 char _sTemp[255];{m_FileObj.write("有转成ISkin\n", string("有转成ISkin\n").size());ISkinContextData *_data = skin->GetContextInterface(node);sprintf(_sTemp, "点数:\t%d\n", _data->GetNumPoints());m_FileObj.write(_sTemp, string(_sTemp).size());sprintf(_sTemp, "骨骼数:\t%d\n", skin->GetNumBones());m_FileObj.write(_sTemp, string(_sTemp).size());Matrix3 _mt3;sprintf(_sTemp, "SKIN_OK?\t%d\n",SKIN_OK == skin->GetSkinInitTM(node,_mt3) ); // 2018-09-12 返回是 SKIN_INVALID_NODE_PTR 不知会不会有问题 GetSkinInitTM是OK的, 但GetBoneInitTM不OKm_FileObj.write(_sTemp, string(_sTemp).size());// 取骨骼:for (int i = 0; i < skin->GetNumBones(); ++i){INode* nodeBone = skin->GetBone(i);const wchar_t* wc_strName = nodeBone->GetName();string s_strName = Util::TDuW2A(wc_strName);sprintf(_sTemp, "骨骼名:\t%d\t%s", i, s_strName.c_str() );m_FileObj.write(_sTemp, string(_sTemp).size());switch ( skin->GetBoneProperty(i) ){case BONE_LOCK_FLAG:sprintf(_sTemp, "\t%s", "BONE_LOCK_FLAG");break;case BONE_ABSOLUTE_FLAG:sprintf(_sTemp, "\t%s", "BONE_ABSOLUTE_FLAG");break;case BONE_SPLINE_FLAG:sprintf(_sTemp, "\t%s", "BONE_SPLINE_FLAG");break;case BONE_SPLINECLOSED_FLAG:sprintf(_sTemp, "\t%s", "BONE_SPLINECLOSED_FLAG");break;case BONE_DRAW_ENVELOPE_FLAG:sprintf(_sTemp, "\t%s", "BONE_DRAW_ENVELOPE_FLAG");break;case BONE_BONE_FLAG:sprintf(_sTemp, "\t%s", "BONE_BONE_FLAG");break;case BONE_DEAD_FLAG:sprintf(_sTemp, "\t%s", "BONE_DEAD_FLAG");break;}m_FileObj.write(_sTemp, string(_sTemp).size());// Bone TM:union xxx {xxx() {}Matrix3 mt3_3;// = skin->GetBoneTm(i);float m[4][3];// = (float*)mt3_3;} _getDataU;_getDataU.mt3_3 = skin->GetBoneTm(i);sprintf(_sTemp, "\t坐标Z:\t%f", _getDataU.m[3][2]);m_FileObj.write(_sTemp, string(_sTemp).size());sprintf(_sTemp, "\n");m_FileObj.write(_sTemp, string(_sTemp).size());}}// END if(_skin)// GetNumBonesFlat:sprintf(_sTemp, "GetNumBonesFlat:\t%d\n", skin->GetNumBonesFlat());m_FileObj.write(_sTemp, string(_sTemp).size());// GetRefFrame:sprintf(_sTemp, "GetRefFrame:\t%d\n", skin->GetRefFrame());m_FileObj.write(_sTemp, string(_sTemp).size());// 输出各顶点坐标:// ISkinContextData:{sprintf(_sTemp, "ISkinContextData:\n");m_FileObj.write(_sTemp, string(_sTemp).size());ISkinContextData *skinData = skin->GetContextInterface(node);sprintf(_sTemp, "\tGetNumPoints:\t%d\n", skinData->GetNumPoints());m_FileObj.write(_sTemp, string(_sTemp).size());sprintf(_sTemp, "\tGetNumAssignedBones:\t%d\n", skinData->GetNumAssignedBones(0));// 骨骼数m_FileObj.write(_sTemp, string(_sTemp).size());sprintf(_sTemp, "\tGetAssignedBone:\t%d\n", skinData->GetAssignedBone(0,0));// 有分配的骨骼m_FileObj.write(_sTemp, string(_sTemp).size());// 各顶点权重:for (int i = 0; i < skinData->GetNumPoints(); ++i){int numOfBones = skinData->GetNumAssignedBones(i);// 本顶点于各骨骼的权重for (int boneAffectedId = 0; boneAffectedId < numOfBones;++boneAffectedId){// 这里取到了权重__weightfloat __weight = skinData->GetBoneWeight(i, boneAffectedId);int boneIndex = skinData->GetAssignedBone( i , boneAffectedId);//string strName = Util::TDuW2A( skin->GetBoneName(boneAffectedId) );string strNameFromBoneIndex = Util::TDuW2A(skin->GetBoneName(boneIndex));if(-1 != boneIndex){sprintf(_sTemp, "\t\tBoneWeight:\t%d,%d:\t%f \t boneIndex:%d(%s)\n  ", i, boneAffectedId, __weight,boneIndex , strNameFromBoneIndex);m_FileObj.write(_sTemp, string(_sTemp).size());}}/*float weight = skinData->GetBoneWeight(i, skinData->GetAssignedBone(0, 0));sprintf(_sTemp, "\t\tBoneWeight:\t%d:%f\n", i , weight);m_FileObj.write(_sTemp, string(_sTemp).size());*/}//sprintf(_sTemp, "\tGetBoneWeight:\t%f\n", skinData->GetBoneWeight(0, skinData->GetAssignedBone(0, 0)));//m_FileObj.write(_sTemp, string(_sTemp).size());}#pragma region 顶点数据输出string labelVData("\n顶点数据输出:\n");m_FileObj.write(labelVData.c_str(), labelVData.size());// 输出顶点数据 , 以能进一步研究顶点蒙皮数据的正确性.// 1. 顶点的次序// Order of the vertices. Get them counter clockwise if the objects is// negatively scaled. This is important if an object has been mirrored.Matrix3 tm = node->GetObjTMAfterWSM(0/*TimeValue*/);BOOL negScale = getTMNegParity(tm);int vx1, vx2, vx3;if (negScale) {vx1 = 2;vx2 = 1;vx3 = 0;}else {vx1 = 0;vx2 = 1;vx3 = 2;}// Get mesh objectBOOL needDel;ObjectState os = node->EvalWorldState(0);TriObject* tri = getTriObjectFromObject(os.obj, 0/*TimeValue*/, needDel);// Extract coords, normals, texture coords, vertex colors, and vertex normals// from MAX mesh.Mesh* mesh = &tri->GetMesh();for (int _iv = 0; _iv < mesh->numVerts; ++_iv){Point3 v1 = mesh->verts[_iv];std::sprintf(_sTemp, "\tv1:%.4f\t%.4f\t%.4f\n", v1.x, v1.y, v1.z);string strV1(_sTemp);m_FileObj.write(strV1.c_str(), strV1.size());}#pragma endregion 顶点数据输出string labelEnd("\n ES ES ES ES ES ES ES ES\n");m_FileObj.write(labelEnd.c_str(), labelEnd.size());
}

`