⼆进制格式PLY模型⽂件的读取与渲染PLY ⽂件头部信息：
ply
format binary_little_endian 1.0
comment VCGLIB generated
element vertex 13469
property float x
property float y
property float z上海国企排名
property float nx
property float ny
property float nz
property uchar red
property uchar green
property uchar blue
property uchar alpha
element face 26934
property list uchar int vertex_indices
end_header
完整可运⾏的 C++ 代码（基于 GLUT）
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <vector>
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
#include <cstdlib>
using namespace std;
const int TRANSFORM_NONE = 0;
const int TRANSFORM_ROTATE = 1;
const int TRANSFORM_SCALE = 2;
const int TRANSFORM_TRANSLATE = 3;
static int press_x, press_y;
const int LIGHT_NUM = 3;
int current_light = 0;
static float x_angle = 0.0;
static float y_angle = 0.0;
static float scale_size = 1;
static float x_dist = 0.0;
static float y_dist = 0.0;
static int obj_mode = 0;
static int xform_mode = 0;
static int proj_mode = 0;
// 存储定点信息
struct Vertex
{
double x, y, z;
double r, g, b, a;
double nx, ny, nz;
};
// 存储与表⾯相关的顶点
struct Face
{
int v1, v2, v3;
};
vector<Vertex> vertices;
vector<Face> faces;
// 加载 PLY ⽂件；此处为了⽅便硬编码有关格式；格式参考：paulbourke/dataformats/ply/
bool load_ply()
{
char fname[] = "data.ply";
FILE* f = fopen(fname, "rb");
if (f == NULL)
{
cout << "file " << fname << " does not exist" << endl;
return fal;
}
int counter = 0;
while (counter < 17)
{
char c;
fread((void*)(&c), sizeof(c), 1, f);
if (c == '\n') {
counter++;
}
}
int vertex_num = 13469;
int face_num = 26934;
for (int i = 0; i < vertex_num; i++) {
float x, y, z;
fread((void*)(&x), 4, 1, f);
fread((void*)(&y), 4, 1, f);
fread((void*)(&z), 4, 1, f);
float nx, ny, nz;
fread((void*)(&nx), 4, 1, f);
fread((void*)(&ny), 4, 1, f);
fread((void*)(&nz), 4, 1, f);
unsigned char r, g, b, a;
fread((void*)(&r), 1, 1, f);
fread((void*)(&g), 1, 1, f);
fread((void*)(&b), 1, 1, f);
fread((void*)(&a), 1, 1, f);
Vertex vertex;
vertex.x = x / 1000;
vertex.y = y / 1000;
vertex.z = z / 1000;
< = nx;
< = ny;
< = nz;
vertex.r = r;
vertex.g = g;
vertex.b = b;
vertex.a = a;
vertices.push_back(vertex);
}
for (int i = 0; i < face_num; i++) {
unsigned char n;
int v1, v2, v3;
fread((unsigned char*)(&n), 1, 1, f);
fread((void*)(&v1), 4, 1, f);
fread((void*)(&v2), 4, 1, f);
fread((void*)(&v3), 4, 1, f);
Face face;
face.v1 = v1;
face.v2 = v2;
face.v3 = v3;
faces.push_back(face);
}
fclo(f);
return true;
}
void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei)w, (GLsizei)h);
glutPostRedisplay();
}
void display(void)
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glShadeModel(GL_SMOOTH);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, 1, 0.1, 100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 3, 0, 0, 0, 0, 1, 0);
// 设置光源
GLfloat light_position[] = { 0.0, 0.0, 1.0, 1.0 };
GLfloat light_direction[] = { 0.0, 0.0, -1.0 };
GLfloat white_color[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat red_color[] = { 1.0, 0.0, 0.0, 1.0 };
GLfloat green_color[] = { 0.0, 1.0, 0.0, 1.0 };
GLfloat blue_color[] = { 0.0, 0.0, 1.0, 1.0 };
GLfloat exponent[] = { 10.0f };
GLfloat cutoff[] = { 20.0f };
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
switch (current_light)
{
ca 1:广州习俗
cutoff[0] = 45;
exponent[0] = 20;
glLightfv(GL_LIGHT0, GL_SPOT_EXPONENT, exponent);
glLightfv(GL_LIGHT0, GL_SPOT_CUTOFF, cutoff);
glLightfv(GL_LIGHT0, GL_SPECULAR, white_color);
break;
ca 2:
glLightfv(GL_LIGHT0, GL_SPECULAR, green_color);
glLightfv(GL_LIGHT0, GL_DIFFUSE, green_color);
glLightfv(GL_LIGHT0, GL_AMBIENT, green_color);
glLightfv(GL_LIGHT0, GL_SPOT_EXPONENT, exponent);
glLightfv(GL_LIGHT0, GL_SPOT_CUTOFF, cutoff);
glLightfv(GL_LIGHT0, GL_SPECULAR, white_color);
break;
default:
exponent[0] = 0;
cutoff[0] = 180;
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, light_direction); glLightfv(GL_LIGHT0, GL_SPOT_EXPONENT, exponent);
glLightfv(GL_LIGHT0, GL_SPOT_CUTOFF, cutoff);
glLightfv(GL_LIGHT0, GL_SPECULAR, white_color);
上海糖醋排骨
glLightfv(GL_LIGHT0, GL_DIFFUSE, white_color);
glLightfv(GL_LIGHT0, GL_AMBIENT, white_color);
glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 1.0); glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.0);
glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, 0.0); break;
}
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);
glTranslatef(x_dist, -y_dist, 0);
glRotatef(x_angle, 0, 1, 0);
glRotatef(y_angle, 1, 0, 0);
glScalef(scale_size, scale_size, scale_size);
glEnable(GL_LIGHTING);
for (int i = 0; i < (int)faces.size(); i++)
{
Face f = faces[i];
Vertex v1 = vertices[f.v1];
Vertex v2 = vertices[f.v2];
Vertex v3 = vertices[f.v3];
glBegin(GL_TRIANGLES);
glColor3f(1, 0, 0);
, v1.ny, v1.nz);
glVertex3f(v1.x, v1.y, v1.z);
, v2.ny, v2.nz);
glVertex3f(v2.x, v2.y, v2.z);
, v3.ny, v3.nz);
glVertex3f(v3.x, v3.y, v3.z);
glEnd();
}
glutSwapBuffers();
}
void mou(int button, int state, int x, int y)
{
if (state == GLUT_DOWN)
{
press_x = x; press_y = y;
if (button == GLUT_LEFT_BUTTON)
xform_mode = TRANSFORM_ROTATE;英国工业革命时间
el if (button == GLUT_MIDDLE_BUTTON)
xform_mode = TRANSFORM_TRANSLATE;
交通安全常识el if (button == GLUT_RIGHT_BUTTON)
xform_mode = TRANSFORM_SCALE;
一觉睡到国庆节}
el if (state == GLUT_UP)
{
xform_mode = TRANSFORM_NONE;
}
}
void mouMotion(int x, int y)
{
if (xform_mode == TRANSFORM_ROTATE)
{
x_angle += (x - press_x) / 5.0;
if (x_angle > 180)
x_angle -= 360;
el if (x_angle < -180)
x_angle += 360;
press_x = x;
y_angle += (y - press_y) / 5.0;
if (y_angle > 180)
y_angle -= 360;
el if (y_angle < -180)
y_angle += 360;
press_y = y;
}
el if (xform_mode == TRANSFORM_SCALE)
{
float old_size = scale_size;
scale_size *= (1 + (y - press_y) / 60.0);
if (scale_size < 0)
scale_size = old_size;
press_y = y;
}
el if (xform_mode == TRANSFORM_TRANSLATE)
皖菜{
x_dist += (x - press_x) / 50.0;
press_x = x;
y_dist += (y - press_y) / 50.0;
press_y = y;
}
// force the redraw function
glutPostRedisplay();
}
void keyboard(unsigned char key, int x, int y)
{
switch (key)
{
ca 'l':
current_light++;
current_light %= LIGHT_NUM;
cout << "Change light source:" << current_light << endl;
break;
ca 'd':
x_dist += 0.05;
break;
ca 'a':
x_dist -= 0.05;
break;
ca 's':
y_dist += 0.05;
break;
ca 'w':
y_dist -= 0.05;
break;
}
glutPostRedisplay();
}
int main(int argc, char** argv)
{
cout << "Help:\n1. Press W A S D to move model.\n2. Press L to change light source.\n3. Drag mou's left button to rotate model.\n4. Drag mou's right button to move model." << endl; glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(600, 600);
一起小学学生glutInitWindowPosition(100, 100);
glutCreateWindow("Team Project");
if (!load_ply())
{
cerr << "Load ply file failed!" << endl;
return -1;
}
glClearColor(0.0, 0.0, 0.0, 0.0);
glutDisplayFunc(display);
glutMouFunc(mou);
glutMotionFunc(mouMotion);
glutKeyboardFunc(keyboard);
glutReshapeFunc(reshape);
glutMainLoop();
return 1;
}
