Question

OpenGL 旋转问题高手指点

我做了一个直升飞机，想让螺旋桨一直不停旋转。
可是生成以后，只有点鼠标才会转，并且旋转后螺旋桨会一直不停的复制自己
这里是我的代码 希望高手指点
#include <gl/glut.h>
#include <gl/glu.h>
#include <math.h>
#include <stdio.h>

int g_delta_rtri = 0;

void init();
void mydisplay();

GLfloat rtri;

void init()
{
glClearColor(1.0,1.0,1.0,1.0);
glColor3f(0.0,1.0,1.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-3.0,3.0,-3.0,3.0,-3.0,3.0);
return TRUE;
}

void mydisplay()
{

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0.5,0.25,0.5,0.0,0.0,0.0,0.0,1.,0.0);

glPushMatrix();
glutSolidSphere(0.45, 20, 20);
glPopMatrix();

glPushMatrix();
glTranslatef(0.5,0.0,0.0);
glScalef(4.0,0.3,0.2);
glutSolidCube(0.5);
glPopMatrix();

glRotatef(rtri,0.0f,1.0f,0.0f);

rtri +=.9f;
if (rtri > 360.0f)
rtri -= 360.0f;
asd();

}
asd()
{

glPushMatrix();
glTranslatef(0.0,0.5,0.0);
glScalef(0.2,0.1,5.0);
glutSolidCube(0.5);
glPopMatrix();

glPushMatrix();
glTranslatef(0.0,0.5,0.0);
glScalef(5.0,0.1,0.2);
glutSolidCube(0.5);
glPopMatrix();

}

int main(int argc,char ** argv){
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(500,500);
glutInitWindowPosition(100,100);
glutCreateWindow("John");
glutDisplayFunc(mydisplay);
init();

glutMainLoop();
}

Answer 1

rtri -= 360.0f;语句后面应该用glutPostRedisplay();来重新绘制主窗口。