【转】《基于MFC的OpenGL编程》Part 5 Transformations - Rotations, Translations and Scaling

三维场景中天体运动模拟

最新推荐文章于 2020-11-04 11:30:29 发布

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最新推荐文章于 2020-11-04 11:30:29 发布

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原文链接：http://www.cnblogs.com/lcxu2/archive/2010/11/23/2004063.html

本文介绍了一个使用OpenGL实现的三维场景模拟示例，该示例中地球围绕太阳旋转，同时带有月球跟随地球转动。通过代码展示了如何运用平移、旋转和缩放等变换来构建动态的天体系统，并加入了鼠标及键盘事件响应机制。

Transformations - Translation, Rotation and Scaling

Translation is nothing but moving along an arbitrary axis. Rotation is spinning about an arbitrary axis. Scaling is increase or decrease in size along an arbitrary axis. One important point to remember is that OpenGL uses a right hand coordinate system where Z-ve goes into the Screen. An object said to be undergoing a transformation could be undergoing a translation, rotation and/or scaling. Understanding how different types of transformations work together is very important.

本文将对地球进行建模，让其围绕着太阳，此外它还会有月球伴随,而在下文中将会加入对鼠标和键盘的事件响应机制。

绘制代码

void CCY457OpenGLView::RenderScene ()
{//绘制函数
        //Draw Sun
     glTranslatef(0.0f,0.0f,-5.0f);
     glRotatef(6,1.0f,0.0f,0.0f);
     glutWireSphere(1.0f,20,20);
    //Draw Planet
     glPushMatrix();
         glTranslatef(-1.2f,-0.5f,-2.0f);
         glRotatef(6,1.0f,0.0f,0.0f);
         glutWireSphere(0.5f,20,20);
        //Draw Moon
         glPushMatrix();
             glTranslatef(-1.2f,-0.5f,-2.0f);
             glRotatef(6,1.0f,0.0f,0.0f);
             glutWireSphere(0.05f,20,20);
         glPopMatrix();
     glPopMatrix();
}

转载于:https://www.cnblogs.com/lcxu2/archive/2010/11/23/2004063.html