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Asked: 2026-05-27T22:12:42+00:00

I am trying to create street lights in my environment box in opengl using

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I am trying to create street lights in my environment box in opengl using c++. I need to create spot lights for this, I have written the code below but it does not work as a spot light. What am I doing wrong, or do you have any other solution for my problem?

GLfloat ambientLight[] = {0.7f, 0.2f, 0.2f, 1.0f};
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientLight); 
GLfloat directedLight[] = {0.7f, 0.7f, 0.7f, 1.0f};
GLfloat directedLightPos[] = {-10.0f, 15.0f, 20.0f, 0.0f};
glLightfv(GL_LIGHT0, GL_DIFFUSE, directedLight);
glLightfv(GL_LIGHT0, GL_POSITION, directedLightPos);

Thanks.

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1 Answer

  1. Editorial Team

    If this is all of your light code you are missing some important lines. You only define ambient/diffuse light colors and a light position.

    • You need to enable lighting with: glEnable(GL_LIGHTING)
    • You need to enable the light you are using: eg: glEnable(GL_LIGHT0)
    • I am not sure but i think you also need to define a material (glMaterial).
    • You need to define the direction of your light: glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, direction);

    Two other notes:

    • Make sure your normal vectors are set correct or you won’t see a result
    • If i remember correctly fixed function lighting only works for vertices and not for pixels. So if you have a light source above a single quad you won’t see any light spot.
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