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    <p>Standard fixed function OpenGL illumination is only evaluated at the vertex positions and the determined colours interpolated over the primitives. So get a spotlight effect, the illumination must be evaluated with high resolution. You can achieve this by either tesselating your plane, or by using a fragment shader that does <em>per fragment lighting</em>.</p> <hr> <p><strong>EDIT to answer comment</strong></p> <h3>Tesselation</h3> <p>Tesselation means, subdividing your plane into a large number of "patches". Like this:</p> <pre><code>+---------------------+ | | | | | | | | | | | | | | | | | | | | +---------------------+ </code></pre> <p>→</p> <pre><code>+-+-+-+-+-+-+-+-+-+-+-+ | | | | | | | | | | | | +-+-+-+-+-+-+-+-+-+-+-+ | | | | | | | | | | | | +-+-+-+-+-+-+-+-+-+-+-+ | | | | | | | | | | | | +-+-+-+-+-+-+-+-+-+-+-+ | | | | | | | | | | | | +-+-+-+-+-+-+-+-+-+-+-+ | | | | | | | | | | | | +-+-+-+-+-+-+-+-+-+-+-+ | | | | | | | | | | | | +-+-+-+-+-+-+-+-+-+-+-+ </code></pre> <h3>Per fragment lighting</h3> <p>Per fragment lighting means, that the lighting equation is evaluated at each rasterized fragment (a fragment is what's commonly referred to a pixel). For this a <em>fragment shader</em> is used, i.e. a small program load into the graphics processor (GPU), that's executed for each fragment/pixel of the rasterized primitive (triangle, line, point).</p> <p>Lighthouse3D has a tutorial about it: <a href="http://www.lighthouse3d.com/tutorials/glsl-tutorial/spot-light-per-pixel/" rel="nofollow">http://www.lighthouse3d.com/tutorials/glsl-tutorial/spot-light-per-pixel/</a> I recommend you read the full GLSL tutorial there, to get an idea, what's going on.</p>
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    1. CO+1 for answering me, but can you explain me more about the 2 techniques since I'm a very new beginner to openGL :) Would really appeciate that.
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    2. COSorry can't +1, requires 15 reputation points
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