Normalize strands noise output range to [0,1] in GLSL and WGSL

Author: rakesh2OO5

src/webgl/shaders/functions/noise3DGLSL.glsl

@@ -104,6 +104,5 @@ float noise(vec3 st, int octaves, float ampFalloff) {
     frequency *= 2.0;
     amplitude *= ampFalloff;
   }
-
-  return result;
+  return (result + 1.0) * 0.5;
 }

src/webgpu/shaders/functions/noise3DWGSL.js

@@ -102,6 +102,5 @@ fn noise(st: vec3<f32>, octaves: i32, ampFalloff: f32) -> f32 {
     frequency *= 2.0;
     amplitude *= ampFalloff;
   }
-
-  return result;
+  return result * 0.5 + 0.5;
 }`;