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    <p>Download the last project(<i>Special Effects</i>) in this url <a href="http://golabistudio.com/siamak/portfolio.html" rel="nofollow">http://golabistudio.com/siamak/portfolio.html</a><br> The c++ source is not available but the shader source is there.<br> What you need to do is pass 2 textures to your shader(while rendering the plane). the first texture is your standard skybox texture. the second texture is your day/night cycle texture. at it's simplest it can be a wide gradient texture of height 1, going from blue to dark. with this second texture passed to your shader you can pick-up one pixel out of it at position of x=time and add the color to your diffuse texture(the first texture). </p> <p>The next step is having the sunrise. Again at it's simplest to do this, you have to create a texture of width 2 with one side the sunrise pixels horizontally and the another the night gradient:(enlarged in width) <a href="http://i.imgur.com/Rl8XJ.png" rel="nofollow">http://i.imgur.com/Rl8XJ.png</a></p> <p>Now having your incoming uv coordinate for the diffuse texture(the first skybox texture) you take the following</p> <pre><code> float2 uvpos; uvpos.y = IN.uv.y;//the position same as skybox texture uvpos.x = 0;//a sample from first horizontal pixel float4 colour1 = tex2D( gradientTexture, uvpos); uvpos.x = 0.5;//a sample from second horizontal pixel float4 colour2 = tex2D( gradientTexture, uvpos); float4 skycolor = lerp(colour1 , colour2, (your day time)); skycolor.xyz += tex2D(skyTexture, IN.uv).xyz; </code></pre> <p>It's very simple implementation, but should get you going i think.</p>
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    1. POProcedural / Dynamic colouring of a skybox in OpenGL
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    1. USSiamak M. Mirzaie
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