OpenGl加载三维模型源代码

#include "ObjLoader.h" #include <fstream> #include <iostream> using namespace std; //GLfloat m = 1.0f; ObjLoader::ObjLoader(string filename) { string line; fstream f; f.open(filename, ios::in); if (!f.is_open()){ cout << "Something Went Wrong When Opening Objfiles" << endl; } while (!f.eof()){ getline(f, line); vector<string>parameters; string tailMark = " "; string ans = ""; line = line.append(tailMark); for (int i = 0; i < line.length(); i++) { char ch = line[i]; if (ch != ' ') { ans+=ch; } else { parameters.push_back(ans); ans = ""; } } //cout << parameters.size() << endl; if (parameters.size() != 4) { cout << "the size is not correct" << endl; } else { if (parameters[0] == "v") { vector<GLfloat>Point; for (int i = 1; i < 4; i++) { GLfloat xyz = atof(parameters[i].c_str()); Point.push_back(xyz); } vSets.push_back(Point); } else if (parameters[0] == "f") { vector<GLint>vIndexSets; for (int i = 1; i < 4; i++){ string x = parameters[i]; string ans = ""; for (int j = 0; j < x.length(); j++) { char ch = x[j]; if (ch != '/') { ans += ch; } else { break; } } GLint index = atof(ans.c_str()); index = index--; vIndexSets.push_back(index); } fSets.push_back(vIndexSets); } /*else if (parameters[0] == "vn") { vector<GLfloat>vnValueSets; for (int i = 1; i < 4; i++) { GLfloat vnxyz = atof(parameters[i].c_str()); vnValueSets.push_back(vnxyz); } vnSets.push_back(vnValueSets); } else if (parameters[0] == "vt") { vector<GLfloat>vtValueSets; for (int i = 1; i < 4; i++) { GLfloat vnxyz = atof(parameters[i].c_str()); vtValueSets.push_back(vnxyz); } vtSets.push_back(vtValueSets); }*/ } } f.close(); } //void ObjLoader::Init() //{ // lastFrameTime = glutGet(GLUT_ELAPSED_TIME); // animationLastingTime = 0; //} // //GLfloat morphRadis(vector<vector<GLfloat>>x) { // GLfloat maxL = 0.0f; // for (int i = 0; i < x.size(); i++) // { // GLfloat vertex[3]; // vertex[0] = (x[i])[0]; // vertex[1] = (x[i])[1]; // vertex[2] = (x[i])[2]; // // GLfloat L = sqrt(vertex[0] * vertex[0] + vertex[1] * vertex[1] + vertex[2] * vertex[2]); // if (L > maxL) { // maxL = L; // } // } // // return maxL; //} void ObjLoader::Draw(){ //GLfloat morphR = morphRadis(vSets); //cout << morphR << endl; //const GLint animationEndTime = 4000; //GLint currentFrameTime = glutGet(GLUT_ELAPSED_TIME); //animationLastingTime += currentFrameTime - lastFrameTime; /*GLfloat step = (GLfloat)animationLastingTime / animationEndTime; if (step > 1.0f) { step = 1.0f; glutSolidSphere(morphR, 40, 50); }*/ glBegin(GL_TRIANGLES); for (int i = 0; i < fSets.size(); i++) { GLfloat VN[3]; //three vertex represrnt a surface GLfloat SV1[3]; GLfloat SV2[3]; GLfloat SV3[3]; /*GLfloat EV1[3]; GLfloat EV2[3]; GLfloat EV3[3]; GLfloat SV1[3]; GLfloat SV2[3]; GLfloat SV3[3];*/ if ((fSets[i]).size() != 3) { cout << "the fSetsets_Size is not correct" << endl; } else { GLint firstVertexIndex = (fSets[i])[0]; GLint secondVertexIndex = (fSets[i])[1]; GLint thirdVertexIndex = (fSets[i])[2]; /*V1[0] = (vSets[firstVertexIndex])[0]; V1[1] = (vSets[firstVertexIndex])[1]; V1[2] = (vSets[firstVertexIndex])[2]; V2[0] = (vSets[secondVertexIndex])[0]; V2[1] = (vSets[secondVertexIndex])[1]; V2[2] = (vSets[secondVertexIndex])[2]; V3[0] = (vSets[thirdVertexIndex])[0]; V3[1] = (vSets[thirdVertexIndex])[1]; V3[2] = (vSets[thirdVertexIndex])[2];*/ SV1[0] = (vSets[firstVertexIndex])[0]; SV1[1] = (vSets[firstVertexIndex])[1]; SV1[2] = (vSets[firstVertexIndex])[2]; SV2[0] = (vSets[secondVertexIndex])[0]; SV2[1] = (vSets[secondVertexIndex])[1]; SV2[2] = (vSets[secondVertexIndex])[2]; SV3[0] = (vSets[thirdVertexIndex])[0]; SV3[1] = (vSets[thirdVertexIndex])[1]; SV3[2] = (vSets[thirdVertexIndex])[2]; /*GLfloat lv1 = sqrt(V1[0] * V1[0] + V1[1] * V1[1] + V1[2] * V1[2]); GLfloat lv2 = sqrt(V2[0] * V2[0] + V2[1] * V2[1] + V2[2] * V2[2]); GLfloat lv3 = sqrt(V3[0] * V3[0] + V3[1] * V3[1] + V3[2] * V3[2]); GLfloat proportion1 = lv1 / morphR; GLfloat proportion2 = lv2 / morphR; GLfloat proportion3 = lv3 / morphR; EV1[0] = V1[0] / proportion1; EV1[1] = V1[1] / proportion1; EV1[2] = V1[2] / proportion1; EV2[0] = V2[0] / proportion2; EV2[1] = V2[1] / proportion2; EV2[2] = V2[2] / proportion2; EV3[0] = V3[0] / proportion3; EV3[1] = V3[1] / proportion3; EV3[2] = V3[2] / proportion3; SV1[0] = EV1[0] * step + (1 - step) * V1[0]; SV1[1] = EV1[1] * step + (1 - step) * V1[1]; SV1[2] = EV1[2] * step + (1 - step) * V1[2]; SV2[0] = EV2[0] * step + (1 - step) * V2[0]; SV2[1] = EV2[1] * step + (1 - step) * V2[1]; SV2[2] = EV2[2] * step + (1 - step) * V2[2]; SV3[0] = EV3[0] * step + (1 - step) * V3[0]; SV3[1] = EV3[1] * step + (1 - step) * V3[1]; SV3[2] = EV3[2] * step + (1 - step) * V3[2];*/ //if there is no vn in the objfile //if (vnSets.size() == 0) { GLfloat vec1[3], vec2[3], vec3[3]; //(x2-x1,y2-y1,z2-z1) vec1[0] = SV1[0] - SV2[0]; vec1[1] = SV1[1] - SV2[1]; vec1[2] = SV1[2] - SV2[2]; //(x3-x2,y3-y2,z3-z2) vec2[0] = SV1[0] - SV3[0]; vec2[1] = SV1[1] - SV3[1]; vec2[2] = SV1[2] - SV3[2]; //(x3-x1,y3-y1,z3-z1) vec3[0] = vec1[1] * vec2[2] - vec1[2] * vec2[1]; vec3[1] = vec2[0] * vec1[2] - vec2[2] * vec1[0]; vec3[2] = vec2[1] * vec1[0] - vec2[0] * vec1[1]; GLfloat D = sqrt(pow(vec3[0], 2) + pow(vec3[1], 2) + pow(vec3[2], 2)); VN[0] = vec3[0] / D; VN[1] = vec3[1] / D; VN[2] = vec3[2] / D; glNormal3f(VN[0], VN[1], VN[2]); //} //if already have vn /*else { if (i < vnSets.size()) { VN[0] = (vnSets[i])[0]; VN[1] = (vnSets[i])[1]; VN[2] = (vnSets[i])[2]; glNormal3f(VN[0], VN[1], VN[2]); } }*/ glVertex3f(SV1[0], SV1[1], SV1[2]); glVertex3f(SV2[0], SV2[1], SV2[2]); glVertex3f(SV3[0], SV3[1], SV3[2]); } } glEnd(); //lastFrameTime = currentFrameTime; }