perf: reduce haze column samples

vendor/clouds3d.js

@@ -379,10 +379,10 @@ var FRAG_SRC = [
             'else if (t2 > 0.0) tEnd = min(tEnd, t2);',
         '}',
         'if (tEnd <= tStart) return 0.0;',
-        'float step = (tEnd - tStart) / 16.0;',
+        'float step = (tEnd - tStart) / 10.0;',
         'float t = tStart + step * 0.5;',
         'float column = 0.0;',
-        'for (int i = 0; i < 16; i++) {',
+        'for (int i = 0; i < 10; i++) {',
             'vec3 p = uCamPos + rd * t;',
             'float alt = max(0.0, length(p - C) - R);',
             'column += exp(-alt / Hs) * step / Hs;',
@@ -438,11 +438,11 @@ var FRAG_SRC = [
         'float Hs = max(0.05, uFrontHazeScaleHeightUnits);',
         'vec3 C = vec3(uCamPos.x, -R, uCamPos.z);',
         'float column = 0.0;',
-        'for (int i = 0; i < 8; i++) {',
-            'float t = dist * (float(i) + 0.5) / 8.0;',
+        'for (int i = 0; i < 6; i++) {',
+            'float t = dist * (float(i) + 0.5) / 6.0;',
             'vec3 p = uCamPos + rd * t;',
             'float alt = max(0.0, length(p - C) - R);',
-            'column += exp(-alt / Hs) * dist / 8.0 / Hs;',
+            'column += exp(-alt / Hs) * dist / 6.0 / Hs;',
         '}',
         'return column;',
     '}',