Project2

glBegin(GL_TRIANGLES);
    for (size_t j=0;j<3;++j)
    {
        //------ 提早在 j==0 時就丟這個face的三個頂點去計算
        if(j==0)
        {
            for(int k=0 ; k<3 ; k++)
            {
                double x = object->vList[object->faceList[i][k].v].ptr[0];
                double y = object->vList[object->faceList[i][k].v].ptr[1];
                double z = object->vList[object->faceList[i][k].v].ptr[2];
                double tx = object->tList[object->faceList[i][k].t].ptr[0];
                double ty = object->tList[object->faceList[i][k].t].ptr[1];

                Vector3D P(x, y, z);
                Vector3D C(tx, ty, 0);

                trianglePosition.push_back(P);
                textureCoord.push_back(C);
            }
            Vector3D tangent_now(0,0,0);
            Vector3D bitangent_now(0,0,0);
            ComputeTangent(   trianglePosition[0], trianglePosition[1], trianglePosition[2],
                        textureCoord[0], textureCoord[1], textureCoord[2],
                        tangent_now,         bitangent_now
                );

            trianglePosition.pop_back(); trianglePosition.pop_back(); trianglePosition.pop_back();
            textureCoord.pop_back(); textureCoord.pop_back(); textureCoord.pop_back();

            tangent.push_back(tangent_now);
            bitangent.push_back(bitangent_now);
        }

        //------
        float tangent_trans[3] = {tangent[i].x, tangent[i].y, tangent[i].z};
        float bitangent_trans[3] = {bitangent[i].x, bitangent[i].y, bitangent[i].z};
        glMultiTexCoord2fv(GL_TEXTURE0, object->tList[object->faceList[i][j].t].ptr);
        glMultiTexCoord2fv(GL_TEXTURE1, object->tList[object->faceList[i][j].t].ptr);
        glMultiTexCoord3fv(GL_TEXTURE2, tangent_trans);
        glMultiTexCoord3fv(GL_TEXTURE3, bitangent_trans);
        //------
        glNormal3fv(object->nList[object->faceList[i][j].n].ptr);
        glVertex3fv(object->vList[object->faceList[i][j].v].ptr);
    }
glEnd();