OpenGL:打开和关闭灯

OpenGL: Turning on and off Lights

本文关键字：OpenGL      更新时间：2023-10-16

我正在编写一个程序，其中我有一个小"polyman"家伙在0,-3跳舞。我把他涂成白色，现在正试图让迪斯科舞厅般的场景继续下去，我创造了一个蓝色和红色的灯，并试图通过使用计数器和if和else语句来交替它们。这一切都在我的renderscene 

float ambientlight[] = {0.0,0.0,1.0,1.0};
float diffuselight[] = {1.0,1.0,1.0,1.0};
float specular[] = {1.0,1.0,1.0,1.0};
float lightpos[] = {0.0,10.0,0.0,1.0};  //light 1
float specref[]={1.0,1.0,1.0,1.0};
float spotdir[]={0.0,-10.0,0.0};
float rectX[6][5], rectY[6][5], rectZ[6][5];
float ambientlight2[] = {1.0,0.0,0.0,1.0};
float diffuselight2[] = {1.0,1.0,1.0,1.0};
float specular2[] = {1.0,1.0,1.0,1.0};
float lightpos2[] = {0.0,10.0,0.0,1.0}; //light 2
float specref2[]={1.0,1.0,1.0,1.0};
float spotdir2[]={0.0,-10.0,0.0};

glColor3f(1.0,1.0,1.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glViewport(0,0,540,440);
glOrtho(-7.0,7.0,-7.0,7.0,5.0,-5.0);
glEnable(GL_LIGHTING);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
if (counterForLights % 2 == 0)   //if counter even
{
    glLightfv(GL_LIGHT0, GL_POSITION,lightpos);
    glLightfv(GL_LIGHT0,GL_AMBIENT,ambientlight);
    glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuselight);
    glLightfv(GL_LIGHT0,GL_SPECULAR, specular);
    glLightf(GL_LIGHT0,GL_SPOT_CUTOFF,10.0);  //light 1
    glLightf(GL_LIGHT0,GL_SPOT_EXPONENT,15.0);
    glLightfv(GL_LIGHT0,GL_SPOT_DIRECTION,spotdir);
    glEnable(GL_LIGHT0);
    counterForLights++;
}
else  //if counter odd
    {
        glLightfv(GL_LIGHT1,GL_AMBIENT,ambientlight2);
        glLightfv(GL_LIGHT1,GL_DIFFUSE,diffuselight2);
        glLightfv(GL_LIGHT1,GL_SPECULAR, specular2);
        glLightf(GL_LIGHT1,GL_SPOT_CUTOFF,10.0);
        glLightf(GL_LIGHT1,GL_SPOT_EXPONENT,15.0);  //light2
        glLightfv(GL_LIGHT1,GL_SPOT_DIRECTION,spotdir2);
        glEnable(GL_LIGHT1);
        counterForLights++;
    }

counterForLights 是一个全局变量，等于 1 。它运行，但从不显示红灯，只显示蓝灯。知道我在这里出错的地方吗？

另外，如果您需要查看我的代码，请告诉我！ :)

您正在启用浅色 0，然后启用浅色 1，然后永远不会再次禁用。因此，从第二帧开始，照明应该是恒定的。坚持并更新光 0 可能更聪明，或者加载系数一次，然后在任一条件分支中执行启用和禁用。

else  //if counter odd
{
    glLightfv(GL_LIGHT1,GL_AMBIENT,ambientlight2);
    glLightfv(GL_LIGHT1,GL_DIFFUSE,diffuselight2);
    glLightfv(GL_LIGHT1,GL_SPECULAR, specular2);
    glLightf(GL_LIGHT1,GL_SPOT_CUTOFF,10.0);
    glLightf(GL_LIGHT1,GL_SPOT_EXPONENT,15.0);  //light2
    glLightfv(GL_LIGHT1,GL_SPOT_DIRECTION,spotdir2);
    glEnable(GL_LIGHT1);
    counterForLights++;
}

看起来您没有为 LIGHT1 指定位置。

另外，我将/强烈/建议不要使用固定函数管道在OpenGL中绘图。网上有很多关于过渡到现代OpenGL的教程。

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