图形：如何围绕太阳旋转地球 [英] Graphics: how to revolve earth around sun

问题描述

建议如何围绕太阳旋转地球？我试图使用openGL用c语言围绕太阳旋转地球。

Suggest, how to revolve earth around sun? I am trying to revolve earth around the sun in c language using openGL.

#include 
 void init(void){
     glClearColor(0.0,0.0,0.0,0.0);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 }
 void display(void){
     glClearColor(0.05,0.05,0.5,0.0);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glColor3f(0.03,0.05,0.09);
     glutSolidSphere(0.5,30,30);//Earth
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
     glTranslatef(.7,.7,.7);
     glColor3f(1.0,1.0,1.0);
     glutSolidSphere(0.2,50,50);//Sun
     glLoadIdentity();
     glFlush();

 }
int main(int argc, char **argv){
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE);
    glutInitWindowPosition(10,10);
    glutInitWindowSize(400,400);
    init();
    glutCreateWindow("Planets");
    glutDisplayFunc(display);
    
    glFlush();
    glutMainLoop();
}

推荐答案

你可能知道地球围绕太阳转圈。因此，你必须将GL-earth移动到类似的物体中并与地球自转重叠。



我发现这很好示例代码或此片段可以帮助您理解它。



提示：OpenGL非常便携，所以你应该找到有趣的部分

As you may know the earth moves around the sun in circle. So you must move your GL-earth in a similar matter and overlap with some earth rotation.

I found this nice example code or this snippets which may help you to understand it.

Hint: the OpenGL is highly portable, so you should find the interesting parts

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