对象加载器 [英] object loader in opengl
本文介绍了对象加载器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经创建了一个程序在C + +也包含opengl和我想创建一个obj加载器为了加载一个obj文件我有！我已经创建了两个函数：
void ReadFile（model * md）
{
/ /打开读取文件OBJINFO.TXT
ifstream obj_file（tree.obj）;
if（obj_file.fail（））
exit（1）;
//获取顶点数量
obj_file>> md->顶点;
//获取面数量
obj_file>> md-面;
//获取顶点坐标
for（int i = 0; i
obj_file> md-> obj_points [i] .x;
obj_file>> md-> obj_points [i] .y;
obj_file>> md-> obj_points [i] .z;
}
//获取面结构
for（int i = 0; i
obj_file>> md-> obj_faces [i] .vn [0];
obj_file>> md-> obj_faces [i] .vn [1];
obj_file>> md-> obj_faces [i] .vn [2];
obj_file>> md-> obj_faces [i] .vn [3];
}
obj_file.close（）;
}
void DisplayModel（model md）
{
glPushMatrix（）;
glBegin（GL_TRIANGLES）;
for（int i = 0; i
glVertex3f（md.obj_points [md.obj_faces [i] .vn [0] -1] .x，md.obj_points [md.obj_faces [i] .vn [0] -1] .y，md.obj_points [md.obj_faces [i] .vn [0] -1] .z）;
glVertex3f（md.obj_points [md.obj_faces [i] .vn [1] -1] .x，md.obj_points [md.obj_faces [i] .vn [1] -1] .y，md。 obj_points [md.obj_faces [i] .vn [1] -1] .z）;
glVertex3f（md.obj_points [md.obj_faces [i] .vn [2] -1] .x，md.obj_points [md.obj_faces [i] .vn [2] -1] .y，md。 obj_points [md.obj_faces [i] .vn [2] -1] .z）;
glVertex3f（md.obj_points [md.obj_faces [i] .vn [2] -1] .x，md.obj_points [md.obj_faces [i] .vn [2] -1] .y，md。 obj_points [md.obj_faces [i] .vn [3] -1] .z）;
}
glEnd（）;
glPopMatrix（）;
}
主要的问题是当我编译项目并运行它时，在视口。我增加了视口的尺寸，以防它小为了出现对象，但情况保持不变！所以我达到的结果，我做了一些错误在这些功能！有人可以帮助我吗？
此外，我还提供了一些obj文件的值：
v 0.158000 0.975000 0.151491 1.000000
v 0.188743 0.025000 0.173826 1.000000
v 0.196000 0.025000 0.151491 1.000000
v 0.158000 0.025000 0.151491 1.000000
v 0.169743 0.025000 0.187631 1.000000
v 0.146257 0.025000 0.187631 1.000000
v 0.127257 0.025000 0.173826 1.000000
vn 0.950370 0.038015 0.308791
vn 0.950370 0.038015 0.308791
vn 0.950370 0.038015 0.308791
vn 0.000000 -1.000000 0.000000
vn 0.000000 -1.000000 0.000000
vn 0.000000 -1.000000 -0.000000
vn 0.587380 0.038015 0.808418
f 1 // 1 2 // 2 3 // 3
f 4 // 4 3 // 5 2 // 6
f 1 / / 7 5 // 8 2 // 9
f 4 // 10 2 // 11 5 // 12
f 1 // 13 6 // 14 5 // 15
f 4 // 16 5 // 17 6 // 18
f 1 // 19 7 // 20 6 // 21
解决方案
//获取顶点数量
obj_file>> md->顶点;
//获取面数量
obj_file>> md-面;
阅读规范。这不是OBJs如何工作。你必须解析出顶点/纹理坐标/法线/面，你一起去。
尝试这样：
// g ++ main.cpp -o main -lglut -lGL -lGLU&& ./main
#include< GL / glut.h>
#include< glm / glm.hpp>
#include< glm / gtx / component_wise.hpp>
#include< vector>
#include< fstream>
#include< sstream>
using namespace std;
using namespace glm;
struct Vertex
{
vec3 position;
vec2 texcoord;
vec3 normal;
};
struct VertRef
{
VertRef（int v，int vt，int vn）
：v（v），vt（vt），vn b $ b {}
int v，vt，vn;
};
vector<顶点> LoadOBJ（istream& in）
{
vector<顶点> ;
vector< vec4>位置（1，vec4（0，0，0，0））;
vector< vec3> texcoords（1，vec3（0，0，0））;
vector< vec3>法线（1，vec3（0，0，0））;
string stringStr;
while（getline（in，lineStr））
{
istringstream lineSS（lineStr）;
string lineType;
lineSS>> lineType;
// vertex
if（lineType ==v）
{
float x = 0，y = 0，z = 0，w = 1;
lineSS>> x>> y>> z>> w;
positions.push_back（vec4（x，y，z，w））;
}
// texture
if（lineType ==vt）
{
float u = 0，v = 0，w = 0 ;
lineSS>> u> v>> w;
texcoords.push_back（vec3（u，v，w））;
}
// normal
if（lineType ==vn）
{
float i = 0，j = 0，k = 0 ;
lineSS>> i>> j>> k;
normals.push_back（normalize（vec3（i，j，k）））;
}
// polygon
if（lineType ==f）
{
vector< VertRef>参考;
string refStr;
while（lineSS>> refStr）
{
istringstream ref（refStr）;
string vStr，vtStr，vnStr;
getline（ref，vStr，'/'）;
getline（ref，vtStr，'/'）;
getline（ref，vnStr，'/'）;
int v = atoi（vStr.c_str（））;
int vt = atoi（vtStr.c_str（））;
int vn = atoi（vnStr.c_str（））;
v =（v> = 0？v：positions.size（）+ v）;
vt =（vt> = 0？vt：texcoords.size（）+ vt）;
vn =（vn> = 0？vn：normals.size（）+ vn）;
refs.push_back（VertRef（v，vt，vn））;
}
if（refs.size（）< 3）
{
//错误，跳过
continue;
}
//三角形，假设n> 3-gons是凸的和共面的
VertRef * p [3] = {& refs [0]，NULL， ;
for（size_t i = 1; i + 1< refs.size（）; ++ i）
{
p [1] =& refs [i + 0];
p [2] =& refs [i + 1];
// http://www.opengl.org/wiki/Calculating_a_Surface_Normal
vec3 U（positions [p [1] - > v] - positions [p [0] - > ; v]）;
vec3 V（positions [p [2] - > v] - positions [p [0] - > v]）;
vec3 faceNormal = normalize（cross（U，V））;
for（size_t j = 0; j <3; ++ j）
{
顶点vert;
vert.position = vec3（positions [p [j] - > v]）;
vert.texcoord = vec2（texcoords [p [j] - > vt]）;
vert.normal =（p [j] - > vn！= 0？normals [p [j] - > vn]：faceNormal）;
verts.push_back（vert）;
}
}
}
}
return verts;
}
int btn;
ivec2 startMouse;
ivec2 startRot，curRot;
ivec2 startTrans，curTrans;
void mouse（int button，int state，int x，int y）
{
if（button == GLUT_LEFT_BUTTON&& state == GLUT_DOWN）
{
btn = button;
startMouse = ivec2（x，glutGet（GLUT_WINDOW_HEIGHT） - y）;
startRot = curRot;
}
if（button == GLUT_RIGHT_BUTTON&& state == GLUT_DOWN）
{
btn = button;
startMouse = ivec2（x，glutGet（GLUT_WINDOW_HEIGHT） - y）;
startTrans = curTrans;
}
}
void motion（int x，int y）
{
ivec2 curMouse（x，glutGet（GLUT_WINDOW_HEIGHT） - y）;
if（btn == GLUT_LEFT_BUTTON）
{
curRot = startRot +（curMouse - startMouse）;
}
else if（btn == GLUT_RIGHT_BUTTON）
{
curTrans = startTrans +（curMouse - startMouse）;
}
glutPostRedisplay（）;
}
vector<顶点>模型;
void display（）
{
glClearColor（0.2f，0.2f，0.2f，1.0f）;
glClear（GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT）;
glMatrixMode（GL_PROJECTION）;
glLoadIdentity（）;
double w = glutGet（GLUT_WINDOW_WIDTH）;
double h = glutGet（GLUT_WINDOW_HEIGHT）;
double ar = w / h;
glTranslatef（curTrans.x / w * 2，curTrans.y / h * 2，0）;
gluPerspective（60，ar，0.1，100）;
glMatrixMode（GL_MODELVIEW）;
glLoadIdentity（）;
glTranslatef（0，0，-10）;
glPushMatrix（）;
{
glRotatef（curRot.x％360，0，1，0）;
glRotatef（-curRot.y％360，1，0，0）;
// object
glColor3ub（255，0，0）;
glEnableClientState（GL_VERTEX_ARRAY）;
glEnableClientState（GL_TEXTURE_COORD_ARRAY）;
glEnableClientState（GL_NORMAL_ARRAY）;
glVertexPointer（3，GL_FLOAT，sizeof（Vertex），& model [0] .position）;
glTexCoordPointer（2，GL_FLOAT，sizeof（Vertex），& model [0] .texcoord）;
glNormalPointer（GL_FLOAT，sizeof（Vertex），& model [0] .normal）;
glDrawArrays（GL_TRIANGLES，0，model.size（））;
glDisableClientState（GL_VERTEX_ARRAY）;
glDisableClientState（GL_TEXTURE_COORD_ARRAY）;
glDisableClientState（GL_NORMAL_ARRAY）;
// bounding cube
glDisable（GL_LIGHTING）;
glColor3ub（255，255，255）;
glutWireCube（7）;
glEnable（GL_LIGHTING）;
}
glPopMatrix（）;
glutSwapBuffers（）;
}
//返回pts的最小/最大点
template< typename Vec>
pair< Vec，Vec> GetExtents（const Vec * pts，size_t stride，size_t count）
{
unsigned char * base =（unsigned char *）pts;
Vec pmin（*（Vec *）base）;
Vec pmax（*（Vec *）base）;
for（size_t i = 0; i {
const Vec& pt = *（Vec *）base;
pmin = glm :: min（pmin，pt）;
pmax = glm :: max（pmax，pt）;
}
return make_pair（pmin，pmax）;
}
//围绕原点
//居中几何，并缩放到适合尺寸^ 3盒
模板< typename Vec>
void CenterAndScale（Vec * pts，size_t stride，size_t count，const typename Vec :: value_type& size）
{
typedef typename Vec :: value_type Scalar;
//获取最小/最大范围
pair< Vec，Vec> exts = GetExtents（pts，stride，count）;
//中心和缩放
const Vec center =（exts.first * Scalar（0.5））+（exts.second * Scalar（0.5f））;
const标量因子= size / glm :: compMax（exts.second - exts.first）;
unsigned char * base =（unsigned char *）pts;
for（size_t i = 0; i {
Vec& pt = *（Vec *）base;
pt =（（pt - center）* factor）;
}
}
int main（int argc，char ** argv）
{
ifstream ifile（test.obj）;
model = LoadOBJ（ifile）;
CenterAndScale（& model [0] .position，sizeof（Vertex），model.size（），7）;
glutInit（& argc，argv）;
glutInitDisplayMode（GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE）;
glutInitWindowSize（640，480）;
glutCreateWindow（OBJ）;
glutDisplayFunc（display）;
glutMouseFunc（mouse）;
glutMotionFunc（motion）;
glEnable（GL_DEPTH_TEST）;
//设置headlamplike light
glShadeModel（GL_SMOOTH）;
glEnable（GL_COLOR_MATERIAL）;
glColorMaterial（GL_FRONT_AND_BACK，GL_AMBIENT_AND_DIFFUSE）;
glEnable（GL_LIGHTING）;
glEnable（GL_LIGHT0）;
glMatrixMode（GL_MODELVIEW）;
glLoadIdentity（）;
GLfloat position [] = {0，0，1，0};
glLightfv（GL_LIGHT0，GL_POSITION，position）;
glPolygonMode（GL_FRONT，GL_FILL）;
glPolygonMode（GL_BACK，GL_LINE）;
glutMainLoop（）;
return 0;
}
LMB-拖动旋转，人民币拖动平底锅
并使用：
v 0.000000 2.000000 2.000000
v 0.000000 0.000000 2.000000
v 2.000000 0.000000 2.000000
v 2.000000 2.000000 2.000000
f -4 -3 -2 -1
v 2.000000 2.000000 0.000000
v 2.000000 0.000000 0.000000
v 0.000000 0.000000 0.000000
v 0.000000 2000000 0.000000
f -4 -3 -2 -1
v 2.000000 2.000000 2.000000
v 2.000000 0.000000 2.000000
v 2.000000 0.000000 0.000000
v 2.000000 2.000000 0.000000
f -4 -3 -2 -1
v 0.000000 2.000000 0.000000
v 0.000000 2.000000 2.000000
v 2.000000 2.000000 2.000000
v 2.000000 2.000000 0.000000
f -4 -3 -2 -1
v 0.000000 2.000000 0.000000
v 0.000000 0.000000 0.000000
v 0.000000 0.000000 2.000000
v 0.000000 2.000000 2.000000
f -4 -3 -2 -1
v 0.000000 0.000000 2.000000
v 0.000000 0.000000 0.000000
v 2.000000 0.000000 0.000000
v 2.000000 0.000000 2.000000
f -4 -3 -2 -1
或：
v 0.000000 2.000000 0.000000
v 0.000000 0.000000 0.000000
v 2.000000 0.000000 0.000000
v 2.000000 2.000000 0.000000
v 4.000000 0.000000 -1.255298
v 4.000000 2.000000 -1.255298
vn 0.000000 0.000000 1.000000
vn 0.000000 0.000000 1.000000
vn 0.276597 0.000000 0.960986
vn 0.276597 0.000000 0.960986
vn 0.531611 0.000000 0.846988
vn 0.531611 0.000000 0.846988
＃6 vertices
＃6 normals
g all
s 1
f 1 // 1 2 // 2 3 // 3 4 // 4
f 4 // 4 3 // 3 5 // 5 6 // 6
＃2 elements
test.obj 。
glm.hpp GLM库。
I have create a program in C++ that contains also opengl and I want to create also an obj loader in order to load an obj file I have ! I have already created two functions which are :
void ReadFile(model *md)
{
// Open the file for reading OBJINFO.TXT
ifstream obj_file("tree.obj");
if (obj_file.fail())
exit(1);
// Get the number of vertices
obj_file >> md->vertices;
// Get the number of faces
obj_file >> md->faces;
// Get the vertex coordinates
for (int i = 0; i < md->vertices; i++)
{
obj_file >> md->obj_points[i].x;
obj_file >> md->obj_points[i].y;
obj_file >> md->obj_points[i].z;
}
// Get the face structure
for (int i = 0; i < md->faces; i++)
{
obj_file >> md->obj_faces[i].vn[0];
obj_file >> md->obj_faces[i].vn[1];
obj_file >> md->obj_faces[i].vn[2];
obj_file >> md->obj_faces[i].vn[3];
}
obj_file.close();
}
void DisplayModel(model md)
{
glPushMatrix();
glBegin(GL_TRIANGLES);
for (int i = 0; i < md.faces; i++)
{
glVertex3f(md.obj_points[md.obj_faces[i].vn[0]-1].x, md.obj_points[md.obj_faces[i].vn[0]-1].y, md.obj_points[md.obj_faces[i].vn[0]-1].z);
glVertex3f(md.obj_points[md.obj_faces[i].vn[1]-1].x, md.obj_points[md.obj_faces[i].vn[1]-1].y, md.obj_points[md.obj_faces[i].vn[1]-1].z);
glVertex3f(md.obj_points[md.obj_faces[i].vn[2]-1].x, md.obj_points[md.obj_faces[i].vn[2]-1].y, md.obj_points[md.obj_faces[i].vn[2]-1].z);
glVertex3f(md.obj_points[md.obj_faces[i].vn[2]-1].x, md.obj_points[md.obj_faces[i].vn[2]-1].y, md.obj_points[md.obj_faces[i].vn[3]-1].z);
}
glEnd();
glPopMatrix();
}
The main problem is that when I compile the project and run it , nothing appears in viewport . I increased also the dimensions of viewport in case it is small in order to appear the object , but the situation remains the same ! So I reach the result that I have done something wrong in these functions ! Could anyone help me ?!
Also I give some values of my obj file :
v 0.158000 0.975000 0.151491 1.000000
v 0.188743 0.025000 0.173826 1.000000
v 0.196000 0.025000 0.151491 1.000000
v 0.158000 0.025000 0.151491 1.000000
v 0.169743 0.025000 0.187631 1.000000
v 0.146257 0.025000 0.187631 1.000000
v 0.127257 0.025000 0.173826 1.000000
vn 0.950370 0.038015 0.308791
vn 0.950370 0.038015 0.308791
vn 0.950370 0.038015 0.308791
vn 0.000000 -1.000000 0.000000
vn 0.000000 -1.000000 0.000000
vn 0.000000 -1.000000 -0.000000
vn 0.587380 0.038015 0.808418
f 1//1 2//2 3//3
f 4//4 3//5 2//6
f 1//7 5//8 2//9
f 4//10 2//11 5//12
f 1//13 6//14 5//15
f 4//16 5//17 6//18
f 1//19 7//20 6//21
解决方案
// Get the number of vertices
obj_file >> md->vertices;
// Get the number of faces
obj_file >> md->faces;
Read the spec again. That's not how OBJs work. You have to parse out the vertexes/texture coordinates/normals/faces as you go along.
Try something like this:
// g++ main.cpp -o main -lglut -lGL -lGLU && ./main
#include <GL/glut.h>
#include <glm/glm.hpp>
#include <glm/gtx/component_wise.hpp>
#include <vector>
#include <fstream>
#include <sstream>
using namespace std;
using namespace glm;
struct Vertex
{
vec3 position;
vec2 texcoord;
vec3 normal;
};
struct VertRef
{
VertRef( int v, int vt, int vn )
: v(v), vt(vt), vn(vn)
{ }
int v, vt, vn;
};
vector< Vertex > LoadOBJ( istream& in )
{
vector< Vertex > verts;
vector< vec4 > positions( 1, vec4( 0, 0, 0, 0 ) );
vector< vec3 > texcoords( 1, vec3( 0, 0, 0 ) );
vector< vec3 > normals( 1, vec3( 0, 0, 0 ) );
string lineStr;
while( getline( in, lineStr ) )
{
istringstream lineSS( lineStr );
string lineType;
lineSS >> lineType;
// vertex
if( lineType == "v" )
{
float x = 0, y = 0, z = 0, w = 1;
lineSS >> x >> y >> z >> w;
positions.push_back( vec4( x, y, z, w ) );
}
// texture
if( lineType == "vt" )
{
float u = 0, v = 0, w = 0;
lineSS >> u >> v >> w;
texcoords.push_back( vec3( u, v, w ) );
}
// normal
if( lineType == "vn" )
{
float i = 0, j = 0, k = 0;
lineSS >> i >> j >> k;
normals.push_back( normalize( vec3( i, j, k ) ) );
}
// polygon
if( lineType == "f" )
{
vector< VertRef > refs;
string refStr;
while( lineSS >> refStr )
{
istringstream ref( refStr );
string vStr, vtStr, vnStr;
getline( ref, vStr, '/' );
getline( ref, vtStr, '/' );
getline( ref, vnStr, '/' );
int v = atoi( vStr.c_str() );
int vt = atoi( vtStr.c_str() );
int vn = atoi( vnStr.c_str() );
v = ( v >= 0 ? v : positions.size() + v );
vt = ( vt >= 0 ? vt : texcoords.size() + vt );
vn = ( vn >= 0 ? vn : normals.size() + vn );
refs.push_back( VertRef( v, vt, vn ) );
}
if( refs.size() < 3 )
{
// error, skip
continue;
}
// triangulate, assuming n>3-gons are convex and coplanar
VertRef* p[3] = { &refs[0], NULL, NULL };
for( size_t i = 1; i+1 < refs.size(); ++i )
{
p[1] = &refs[i+0];
p[2] = &refs[i+1];
// http://www.opengl.org/wiki/Calculating_a_Surface_Normal
vec3 U( positions[ p[1]->v ] - positions[ p[0]->v ] );
vec3 V( positions[ p[2]->v ] - positions[ p[0]->v ] );
vec3 faceNormal = normalize( cross( U, V ) );
for( size_t j = 0; j < 3; ++j )
{
Vertex vert;
vert.position = vec3( positions[ p[j]->v ] );
vert.texcoord = vec2( texcoords[ p[j]->vt ] );
vert.normal = ( p[j]->vn != 0 ? normals[ p[j]->vn ] : faceNormal );
verts.push_back( vert );
}
}
}
}
return verts;
}
int btn;
ivec2 startMouse;
ivec2 startRot, curRot;
ivec2 startTrans, curTrans;
void mouse(int button, int state, int x, int y )
{
if( button == GLUT_LEFT_BUTTON && state == GLUT_DOWN )
{
btn = button;
startMouse = ivec2( x, glutGet( GLUT_WINDOW_HEIGHT ) - y );
startRot = curRot;
}
if( button == GLUT_RIGHT_BUTTON && state == GLUT_DOWN )
{
btn = button;
startMouse = ivec2( x, glutGet( GLUT_WINDOW_HEIGHT ) - y );
startTrans = curTrans;
}
}
void motion( int x, int y )
{
ivec2 curMouse( x, glutGet( GLUT_WINDOW_HEIGHT ) - y );
if( btn == GLUT_LEFT_BUTTON )
{
curRot = startRot + ( curMouse - startMouse );
}
else if( btn == GLUT_RIGHT_BUTTON )
{
curTrans = startTrans + ( curMouse - startMouse );
}
glutPostRedisplay();
}
vector< Vertex > model;
void display()
{
glClearColor( 0.2f, 0.2f, 0.2f, 1.0f );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
double w = glutGet( GLUT_WINDOW_WIDTH );
double h = glutGet( GLUT_WINDOW_HEIGHT );
double ar = w / h;
glTranslatef( curTrans.x / w * 2, curTrans.y / h * 2, 0 );
gluPerspective( 60, ar, 0.1, 100 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0, 0, -10 );
glPushMatrix();
{
glRotatef( curRot.x % 360, 0, 1, 0 );
glRotatef( -curRot.y % 360, 1, 0, 0 );
// object
glColor3ub( 255, 0, 0 );
glEnableClientState( GL_VERTEX_ARRAY );
glEnableClientState( GL_TEXTURE_COORD_ARRAY );
glEnableClientState( GL_NORMAL_ARRAY );
glVertexPointer( 3, GL_FLOAT, sizeof(Vertex), &model[0].position );
glTexCoordPointer( 2, GL_FLOAT, sizeof(Vertex), &model[0].texcoord );
glNormalPointer( GL_FLOAT, sizeof(Vertex), &model[0].normal );
glDrawArrays( GL_TRIANGLES, 0, model.size() );
glDisableClientState( GL_VERTEX_ARRAY );
glDisableClientState( GL_TEXTURE_COORD_ARRAY );
glDisableClientState( GL_NORMAL_ARRAY );
// bounding cube
glDisable( GL_LIGHTING );
glColor3ub( 255, 255, 255 );
glutWireCube( 7 );
glEnable( GL_LIGHTING );
}
glPopMatrix();
glutSwapBuffers();
}
// return the min/max points of pts
template< typename Vec >
pair< Vec, Vec > GetExtents( const Vec* pts, size_t stride, size_t count )
{
unsigned char* base = (unsigned char*)pts;
Vec pmin( *(Vec*)base );
Vec pmax( *(Vec*)base );
for( size_t i = 0; i < count; ++i, base += stride )
{
const Vec& pt = *(Vec*)base;
pmin = glm::min( pmin, pt );
pmax = glm::max( pmax, pt );
}
return make_pair( pmin, pmax );
}
// centers geometry around the origin
// and scales it to fit in a size^3 box
template< typename Vec >
void CenterAndScale( Vec* pts, size_t stride, size_t count, const typename Vec::value_type& size )
{
typedef typename Vec::value_type Scalar;
// get min/max extents
pair< Vec, Vec > exts = GetExtents( pts, stride, count );
// center and scale
const Vec center = ( exts.first * Scalar( 0.5 ) ) + ( exts.second * Scalar( 0.5f ) );
const Scalar factor = size / glm::compMax( exts.second - exts.first );
unsigned char* base = (unsigned char*)pts;
for( size_t i = 0; i < count; ++i, base += stride )
{
Vec& pt = *(Vec*)base;
pt = ( ( pt - center ) * factor );
}
}
int main( int argc, char **argv )
{
ifstream ifile( "test.obj" );
model = LoadOBJ( ifile );
CenterAndScale( &model[0].position, sizeof( Vertex ), model.size(), 7 );
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE );
glutInitWindowSize( 640, 480 );
glutCreateWindow( "OBJ" );
glutDisplayFunc( display );
glutMouseFunc( mouse );
glutMotionFunc( motion );
glEnable( GL_DEPTH_TEST );
// set up "headlamp"-like light
glShadeModel( GL_SMOOTH );
glEnable( GL_COLOR_MATERIAL );
glColorMaterial( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE ) ;
glEnable( GL_LIGHTING );
glEnable( GL_LIGHT0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
GLfloat position[] = { 0, 0, 1, 0 };
glLightfv( GL_LIGHT0, GL_POSITION, position );
glPolygonMode( GL_FRONT, GL_FILL );
glPolygonMode( GL_BACK, GL_LINE );
glutMainLoop();
return 0;
}
LMB-drag rotates, RMB-drag "pans".
And use this:
v 0.000000 2.000000 2.000000
v 0.000000 0.000000 2.000000
v 2.000000 0.000000 2.000000
v 2.000000 2.000000 2.000000
f -4 -3 -2 -1
v 2.000000 2.000000 0.000000
v 2.000000 0.000000 0.000000
v 0.000000 0.000000 0.000000
v 0.000000 2.000000 0.000000
f -4 -3 -2 -1
v 2.000000 2.000000 2.000000
v 2.000000 0.000000 2.000000
v 2.000000 0.000000 0.000000
v 2.000000 2.000000 0.000000
f -4 -3 -2 -1
v 0.000000 2.000000 0.000000
v 0.000000 2.000000 2.000000
v 2.000000 2.000000 2.000000
v 2.000000 2.000000 0.000000
f -4 -3 -2 -1
v 0.000000 2.000000 0.000000
v 0.000000 0.000000 0.000000
v 0.000000 0.000000 2.000000
v 0.000000 2.000000 2.000000
f -4 -3 -2 -1
v 0.000000 0.000000 2.000000
v 0.000000 0.000000 0.000000
v 2.000000 0.000000 0.000000
v 2.000000 0.000000 2.000000
f -4 -3 -2 -1
Or this:
v 0.000000 2.000000 0.000000
v 0.000000 0.000000 0.000000
v 2.000000 0.000000 0.000000
v 2.000000 2.000000 0.000000
v 4.000000 0.000000 -1.255298
v 4.000000 2.000000 -1.255298
vn 0.000000 0.000000 1.000000
vn 0.000000 0.000000 1.000000
vn 0.276597 0.000000 0.960986
vn 0.276597 0.000000 0.960986
vn 0.531611 0.000000 0.846988
vn 0.531611 0.000000 0.846988
# 6 vertices
# 6 normals
g all
s 1
f 1//1 2//2 3//3 4//4
f 4//4 3//3 5//5 6//6
# 2 elements
for test.obj.
glm.hpp is from the GLM library.
这篇关于对象加载器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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