Add p5.strands support for randomGaussian()

src/strands/strands_api.js

@@ -337,6 +337,7 @@ export function initGlobalStrandsAPI(p5, fn, strandsContext) {
   const originalNoise = fn.noise;
   const originalNoiseDetail = fn.noiseDetail;
   const originalRandom = fn.random;
+  const originalRandomGaussian=fn.randomGaussian;
   const originalRandomSeed = fn.randomSeed;
   const originalMillis = fn.millis;
 
@@ -415,6 +416,19 @@ export function initGlobalStrandsAPI(p5, fn, strandsContext) {
     if (!strandsContext.active) {
       return originalRandom.apply(this, args);
     }
+    augmentFn(fn, p5, 'randomGaussian', function(...args){
+      if(!strandsContext.active){
+        return originalRandomGaussian.apply(this, args);
+      }
+      const mean = args.length >= 1 ? args[0] : 0;
+      const stdDev = args.length>=2 ? args[1] : 1;
+
+      const u1 = this.random();
+      const u2 = this.random();
+      const z = this.sqrt(this.log(u1).mult(-2)).mult(this.cos(u2.mult(2*Math.PI)));
+
+      return z.mult(p5.strandsNode(stdDev)).add(p5.strandsNode(mean));
+    });
 
     const randomVertSnippet = strandsContext.backend.getRandomVertexShaderSnippet();
     const randomFragSnippet = strandsContext.backend.getRandomFragmentShaderSnippet();