我是 OpenGL 的新手。我想编写一个程序,显示两种不同颜色的两种形状,一个圆环和一个球体,以及两个围绕它们旋转的独立光源。
到目前为止,我有这段代码可以制作一个很好地围绕圆环旋转的光源。但是我无法弄清楚如何添加一个球体和一个围绕它旋转的新光源。
编辑:
这是我的整个代码。按下键盘上的“s”或“d”键时灯会旋转
#include "stdafx.h"
#include <windows.h>
#include <glut.h>
static int spin = 0;
bool updown = false;
bool leftright = false;
GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 };
GLfloat yellow[] = { 1.0, 1.0, 0.0, 1.0 };
GLfloat red[] = { 1.0, 0.0, 0.0, 1.0 };
GLfloat cyan[] = { 0.0, 1.0, 1.0, 1.0 };
GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat direction[] = { 1.0, 1.0, 1.0, 0.0 };
GLfloat direction2[] = { 1.0, 0.0, 0.0, 0.0 };
void display() {
GLfloat position[] = { 0.0, 0.0, 1.5, 1.0 };
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, cyan);
glMaterialfv(GL_FRONT, GL_SPECULAR, white);
glMaterialf(GL_FRONT, GL_SHININESS, 30);
glTranslatef(-2.0, 1.0, 0.0);
glPushMatrix ();
if(updown){
glRotated ((GLdouble) spin, 1.0, 0.0, 0.0);
}
if(leftright){
glRotated ((GLdouble) spin, 0.0, 1.0, 0.0);
}
glLightfv (GL_LIGHT0, GL_POSITION, position);
glTranslated (0.0, 0.0, 1.5);
glDisable (GL_LIGHTING);
glColor3f (0.0, 1.0, 1.0);
glEnable (GL_LIGHTING);
glPopMatrix();
glutSolidTorus(0.275, 0.85, 16, 40);
glPopMatrix();
glFlush();
}
void reshape(GLint w, GLint h) {
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
GLfloat aspect = GLfloat(w) / GLfloat(h);
glLoadIdentity();
if (w <= h) {
glOrtho(-2.5, 2.5, -2.5/aspect, 2.5/aspect, -10.0, 10.0);
} else {
glOrtho(-2.5*aspect, 2.5*aspect, -2.5, 2.5, -10.0, 10.0);
}
}
void init() {
glLightfv(GL_LIGHT0, GL_AMBIENT, black);
glLightfv(GL_LIGHT0, GL_DIFFUSE, yellow);
glLightfv(GL_LIGHT0, GL_SPECULAR, white);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_DEPTH_TEST);
}
void keyboard(unsigned char button, int x, int y)
{
switch (button) {
case 's':
updown = true;
leftright = false;
spin = (spin + 30) % 360;
glutPostRedisplay();
break;
case 'd':
updown = false;
leftright = true;
spin = (spin + 30) % 360;
glutPostRedisplay();
break;
default:
break;
}
}
int main(int argc, char** argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowPosition(80, 80);
glutInitWindowSize(800, 600);
glutCreateWindow("Shapes and light");
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
init();
glutMainLoop();
}