OpenGL_4 颜色渲染

颜色渲染主要使用glColor3f()语句，设置好颜色后，以后所使用的所有绘图语句都将以当前设置的颜色进行绘图，如设置为红色，调用语句glColor(1.0f,0.0f,1.0f);再次调用glVertex3f()语句时所绘制的点都将是红色。

如绘制三种颜色混合的三角形和纯红色的四边形的DrawGLScene()代码:

int DrawGLScene(GLvoid){glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);//清除屏幕和深度缓存glLoadIdentity();//重置当前的模型观察矩阵glTranslatef(-1.5f, 0.0f, -6.0f);glBegin(GL_TRIANGLES);//绘制三角形glColor3f(1.0f, 0.0f, 0.0f);//设置当前色为红色glVertex3f(0.0f, 1.0f, 0.0f);//上顶点glColor3f(0.0f, 1.0f, 0.0f);//设置当前色为绿色glVertex3f(-1.0f, -1.0f, 0.0f);//左下点glVertex3f(0.0f, 0.0f, 1.0f);//设置当前颜色为蓝色glVertex3f(1.0f, -1.0f, 0.0f);//右下点glEnd();glColor3f(0.0f, 0.0f, 1.0f);//设置当前颜色为蓝色glBegin(GL_QUADS);//绘制正方形//左上角开始，顺时针方向用glVertex3f绘制四个顶点glVertex3f(-1.0f, 1.0f, 0.0f);//左上glVertex3f(1.0f, 1.0f, 0.0f);//右上glVertex3f(1.0f, -1.0f, 0.0f);//右下glVertex3f(-1.0f, -1.0f, 0.0f);//左下glEnd();return TRUE;}