HDR for sky rendering

[stephen-hqxu]

With atmoshperic scattering, the color of the sky can easily go beyond the standard range [0.0, 1.0], so the sun is very large and bright.

Consider doing HDR rendering with exposure correction like:

uniform float Exposure;

FragColor = vec4(pow(1.0f - exp(-Exposure * atmosphere(...)), vec3(1.0f / 2.2f)), 1.0f);

[stephen-hqxu]

Done

The screenshot is taken with the same sun elevation angle. With the help of filmic HDR tone mapping and gamma correction, the sunlight looks much smoother.