[英]Opengl and c++ drawing multiple cubes
所以我可以畫一個立方體,但是我想畫多個立方體,我不知道怎么畫。 你們能幫幫我嗎? 這是我如何繪制立方體的代碼:
#include <GL/freeglut.h>
#include <stdlib.h>
void initGL(int width, int height)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,2.0f,100.0f);
glMatrixMode(GL_MODELVIEW);
const GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
const GLfloat mat_ambient[] = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[] = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };
glEnable(GL_LIGHT0);glEnable(GL_LIGHTING);
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,2.0f,100.0f);
glMatrixMode(GL_MODELVIEW);
glEnable(GL_CULL_FACE);glCullFace(GL_BACK);
}
static void display(void)
{
glLoadIdentity();
glPushMatrix();
glTranslatef(0.0,0.0,-10);
glRotatef(60,1,0,0);
glRotatef(60,0,1,0);
glutSolidCube(2);
glLoadIdentity();
glTranslatef(0.0,0.0,-10);
glRotatef(60,1,0,0);
glRotatef(60,0,1,0);
glutSolidCube(2);
glPopMatrix();
glFlush();
}
static void idle(void)
{
glutPostRedisplay();
}
int main(int argc, char *argv[])
{
int width = 640;
int height = 480;
glutInit(&argc, argv);
glutInitWindowSize(width,height);
glutInitWindowPosition(10,10);
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
glutCreateWindow("Lab 1: Hello OpenGL World !");
glutDisplayFunc(display);
glutIdleFunc(idle);
initGL(width, height);
glutMainLoop();
return EXIT_SUCCESS;
}
我需要像我正在繪制的那樣繪制多個立方體。 我嘗試了 for 但我今天剛開始使用 opengl 並且不知道我在做什么。 我已經嘗試了很多事情並且非常惱火。 你也推薦什么書嗎?
“我今天剛開始使用opengl”
完全理解OpenGL需要一段時間,但如果您查閱過您的學習資料,您應該已經在代碼中發現了一些錯誤。
你需要定義一個glutReshapeFunc
函數:沒有這個你的視口是 undefined 。 @KevinSpaghetti也是對的,您的glutDisplayFunc
有一個錯誤:所有立方體都繪制在同一位置,並且未指定模型視圖矩陣。
這是一個實際有效的代碼。
#include <GL/glew.h>
#include <GL/freeglut.h>
#include <iostream>
/*******************************************************************************
********************************************************************************
********************************************************************************/
struct { int width = 640; int height = 480; } window;
/*******************************************************************************
********************************************************************************
********************************************************************************/
void resize(int width, int height)
{
glViewport(0, 0, (window.width = width), (window.height = height));
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45, ((GLdouble)window.width / window.height), 2, 100);
glMatrixMode(GL_MODELVIEW);
}
/*******************************************************************************
********************************************************************************
********************************************************************************/
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 30, 0, 0, 0, 0, 1, 0);
glRotatef(-30, 0, 1, 0); // <----- rotate entire scene by 30 degrees
glColor3f(0.5f, 0.0f, 0.0f);
for (int i = 0; i < 3; ++i) // <----- draw three cubes
{
glPushMatrix();
glRotatef(60, 1.0, 0.0, 0.0);
glRotatef(60, 0.0, 0.1, 0.0);
glutSolidCube(5);
glPopMatrix();
glTranslatef(0.0, 0.0, -10.0f);
}
glFlush();
}
/*******************************************************************************
********************************************************************************
********************************************************************************/
void initGL(void)
{
glClearColor(0.8f, 0.8f, 0.8f, 1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glFrontFace(GL_CCW);
const GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
const GLfloat mat_ambient[] = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[] = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_COLOR_MATERIAL);
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
}
/*******************************************************************************
********************************************************************************
********************************************************************************/
int main(int argc, char *argv[])
{
//.....................
glutInit(&argc, argv);
glutInitContextFlags(GLUT_FORWARD_COMPATIBLE);
glutInitContextProfile(GLUT_COMPATIBILITY_PROFILE);
glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_GLUTMAINLOOP_RETURNS);
glutInitWindowSize(window.width, window.height);
glutInitWindowPosition(10, 10);
glutInitDisplayMode(GLUT_DEPTH | GLUT_RGB | GLUT_SINGLE);
glutCreateWindow("Lab 1: Hello OpenGL World !");
if (glewInit() != GLEW_OK) exit(EXIT_FAILURE);
glutReshapeFunc(resize);
glutDisplayFunc(display);
initGL();
glutMainLoop();
std::cout << "...it worked!";
//.....................
return 0;
}
我會推薦: OpenGL 編程指南。 它是舊的OpenGL,但仍然相關。
glPushMatrix();
glTranslatef(0.0,0.0,-10);
glRotatef(60,1,0,0);
glRotatef(60,0,1,0);
glutSolidCube(2);
glLoadIdentity();
glTranslatef(0.0,0.0,-10);
glRotatef(60,1,0,0);
glRotatef(60,0,1,0);
glutSolidCube(2);
glPopMatrix();
在這里,您似乎在同一位置繪制了 2 個立方體,因此第二個繪制在第一個之上,嘗試將代碼更改為
glPushMatrix();
glTranslatef(2,0.0,-10);
glRotatef(60,1,0,0);
glRotatef(60,0,1,0);
glutSolidCube(2);
glLoadIdentity();
glTranslatef(0.0,0.0,-10);
glRotatef(60,1,0,0);
glRotatef(60,0,1,0);
glutSolidCube(2);
glPopMatrix();
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