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

三维场景中的天体运动

最新推荐文章于 2020-11-04 11:30:29 发布

最新推荐文章于 2020-11-04 11:30:29 发布 · 72 阅读

本文介绍了一个使用OpenGL实现的三维场景案例，该场景中包括太阳、地球和月球等天体，并通过平移、旋转和缩放等操作来模拟它们之间的相对运动。此外，还实现了对鼠标和键盘事件的响应。

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

voidCCY457OpenGLView::RenderScene()
{//绘制函数
//DrawSun
glTranslatef(0.0f,0.0f,-5.0f);
glRotatef(6,1.0f,0.0f,0.0f);
glutWireSphere(1.0f,20,20);
//DrawPlanet
glPushMatrix();
glTranslatef(-1.2f,-0.5f,-2.0f);
glRotatef(6,1.0f,0.0f,0.0f);
glutWireSphere(0.5f,20,20);
//DrawMoon
glPushMatrix();
glTranslatef(-1.2f,-0.5f,-2.0f);
glRotatef(6,1.0f,0.0f,0.0f);
glutWireSphere(0.05f,20,20);
glPopMatrix();
glPopMatrix();
}