atmosphere: disable haze for rays that do not hit the Earth sphere

vendor/clouds3d.js

@@ -345,12 +345,13 @@ var FRAG_SRC = [
             'float cIn = dot(oc, oc) - R * R;',
             'float discIn = b * b - cIn;',
             'float tInner = 100000.0;',
+            'float hitsInner = 0.0;',
             'if (discIn > 0.0) {',
                 'float sq = sqrt(discIn);',
                 'float t1 = -b - sq;',
                 'float t2 = -b + sq;',
-                'if (t1 > 0.0) tInner = t1;',
+                'if (t1 > 0.0) { tInner = t1; hitsInner = 1.0; }',
-                'else if (t2 > 0.0) tInner = t2;',
+                'else if (t2 > 0.0) { tInner = t2; hitsInner = 1.0; }',
             '}',
             'if (tInner < 100000.0) tEnd = min(tEnd, tInner);',
             'if (tEnd <= tStart) { gl_FragColor = vec4(0.0); return; }',
@@ -375,7 +376,7 @@ var FRAG_SRC = [
                 't += step;',
             '}',
             'float rawAlpha = clamp(1.0 - exp(-tau), 0.0, 1.0);',
-            'float alpha = clamp(rawAlpha * uAtmoGain, 0.0, uAtmoMaxAlpha);',
+            'float alpha = clamp(rawAlpha * uAtmoGain * hitsInner, 0.0, uAtmoMaxAlpha);',
             'vec3 col = scatter / max(rawAlpha, 1e-4);',
             'gl_FragColor = vec4(col, alpha);',
             'return;',