const PI = 3.14159;
const INV_SQRT_2 = 0.70710678118654752440; // 1 / sqrt(2)
const INV_SQRT_3 = 0.57735026918962576451; // 1 / sqrt(3)
// in every direction from 0,0
// total = (2n + 1)^2
const SHADOW_SAMPLES = 2;
const INV_SHADOW_SAMPLES = 1.0 / 25.0;
const FOG_MAX_STEPS = 30;
const FOG_STEP_SIZE = 5.0;
const FOG_SCALE = 0.01;
const FOG_DENSITY = 2.0;
const FOG_ALPHA = 1.0;
const FOG_BLEND_STEPS = 4;
