关于glTranslatef函数

#include<GL/glut.h>

void display()
{  
	glClearColor(0.0,0.0,0.0,0.0);
	glOrtho(-10,10,-10,10,-10,10);
	glClear(GL_COLOR_BUFFER_BIT);   
 
	glTranslatef(-4.5f,0.0f,-6.0f);
	glBegin(GL_TRIANGLES);
	   glColor3f(1.0,0.0,0.0);

	glVertex3f(0.0f,0.0f, 0.0f);
	glVertex3f(1.0f,0.0f, 0.0f);
	glVertex3f(0.0f,1.0f, 0.0f);
	glEnd();

	glTranslatef(1.0f,0.0f,-1.0f);
	glBegin(GL_TRIANGLES);
	 glColor3f(1.0,0.0,0.0);
 
	glVertex3f(0.0f,0.0f, 0.0f);
	glVertex3f(1.0f,0.0f, 0.0f);
	glVertex3f(0.0f,1.0f, 0.0f);
	glEnd();

	glFlush();
}

int main(int argc, char* argv[])
{
	 
    glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(500, 500);
	glutInitWindowPosition(0, 0);
	glutCreateWindow("Simple");
    glClearColor(1.0,1.0,1.0,0.0);
	glutDisplayFunc(display);
    
	glutMainLoop();   //使程序一直处在监听状态中
        
  
	return 0;
}

沿着 X, Y 和 Z 轴移动。

注意在glTranslatef(x, y, z)中,当您移动的时候，您并不是相对屏幕中心移动，而是相对与当前所在的屏幕位置。其作用就是将你绘点坐标的原点在当前原点的基础上平移一个(x,y,z)向量

于是乎第二个三角形是相当于第一个三角形向左平移一个单位

如果第二个三角形的z方向小于 -4的话，将会看不到的

右边的三角形是第一步绘制的，可以看到该三角形绘制的坐标系，实际上是以(-4.5f,0.0f,-6.0f)为原点的。