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d3e81f6d18
This adds new options for user to choose how the terrain should be rendered: - shading disabled - color of terrain is determined only from map texture - shading enabled - color of terrain is determined using Phong's shading model, taking into account map texture, terrain normal vector, scene light(s) and terrain material's ambient+specular colors and shininess (configuration of lights is not there yet - now we always have a single point light with white color at the middle of the scene at 1km above the zero elevation)