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4

No, glsl can't have parameters in the main function (as well as return values). The doc says: Just like in C/C++, execution of a shader begins with the function main. This function takes no parameters and returns no values.


4

What you need is to retroproject the point on your map, from the inverse Mercator into 3d space, then place the sun as a directional light (not point like your image shows), and adjust the point for earth tilting (according to earth-sun rotation plane), then you can evaluate the light. It will automatically give you the weird valley shape that we see in ...


3

I believe that OpenGL's standard clipping volume is [-1, 1] x [-1, 1] x [-1, 1]. You want to clip at [-1, 1] x [-1, 1] x [0, 1]. You can achieve this by transforming the z-coordinate after all transformations have been applied to the vertex position (model, view and projection transforms). In other words, you want to operate on the screen coordinates of the ...



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