OpenGL织梦之旅【第四章】第1节.设置视点函数gluLookAt

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VIP免费原创最新推荐文章于 2026-05-30 13:49:48 发布 4.4k 阅读 AI 写同款· GEO 优化 ›

OpenGL之坐标系以及单位 OpenGL 图像编程实践。阅读详情

在做所有的事情之前，我们必须要了解怎么在3D的世界中绘图。这也是为了帮助我们调整视点，不然调来调去都是黑框...

3D世界中的坐标系也是笛卡尔坐标系，y轴就像是现实世界中的“高低”，而x和z像是地面的坐标。

我们写一个DrawBox函数，这函数负责绘制一个正方体。

void DrawBox()
{
	
	glBegin(GL_POLYGON);
			

			glColor3f(1.0,0.0,0.0);
		    glVertex3f(0.0f, 0.0f, 0.0f);	 
			glVertex3f(0.0f, 0.0f, 1.0f);
			glVertex3f(1.0f, 0.0f, 1.0f);
			glVertex3f(1.0f, 0.0f, 0.0f);
	glEnd();
	glBegin(GL_POLYGON);		
    
			glColor3f(0.0,1.0,0.0);
			glVertex3f(0.0f, 0.0f, 0.0f);	 
			glVertex3f(1.0f, 0.0f, 0.0f);
			glVertex3f(1.0f, 1.0f, 0.0f);
			glVertex3f(0.0f, 1.0f, 0.0f);
	glEnd();
	glBegin(GL_POLYGON);		
		
			glColor3f(0.0,0.0,1.0);
			glVertex3f(0.0f, 0.0f, 0.0f);	
			glVertex3f(0.0f, 1.0f, 0.0f);
			glVertex3f(0.0f, 1.0f, 1.0f);
			glVertex3f(0.0f, 0.0f, 1.0f);
	glEnd();
	glBegin(GL_POLYGON);		
		
			glColor3f(1.0,0.0,1.0);
			glVertex3f(1.0f, 0.0f, 0.0f);	
			glVertex3f(1.0f, 0.0f, 1.0f);
			glVertex3f(1.0f, 1.0f, 1.0f);
			glVertex3f(1.0f, 1.0f, 0.0f);
		glEnd();
	glBegin(GL_POLYGON);		
		
			glColor3f(1.0,1.0,0.0);
			glVertex3f(0.0f, 1.0f, 0.0f);	
			glVertex3f(0.0f, 1.0f, 1.0f);
			glVertex3f(1.0f, 1.0f, 1.0f);
			glVertex3f(1.0f, 1.0f, 0.0f);
	glEnd();			
	glBegin(GL_POLYGON);		
		
			glColor3f(0.0,1.0,1.0);
			glVertex3f(0.0f, 0.0f, 1.0f);
			glVertex3f(1.0f, 0.0f, 1.0f);
			glVertex3f(1.0f, 1.0f, 1.0f);
			glVertex3f(0.0f, 1.0f, 1.0f);
		glEnd();
}