// extents of grid in world coordinates
float gridSize = 100.0;

// size of one cell
float gridCellSize = 0.025;

// color of thin lines
vec4 gridColorThin = vec4(0.5, 0.5, 0.5, 1.0);

// color of thick lines (every tenth line)
vec4 gridColorThick = vec4(0.0, 0.0, 0.0, 1.0);

// minimum number of pixels between cell lines before LOD switch should occur. 
const float gridMinPixelsBetweenCells = 2.0;