Fix randfn to prevent generating of nan values

core/math/random_pcg.h

@@ -126,10 +126,18 @@ public:
 	}
 
 	_FORCE_INLINE_ double randfn(double p_mean, double p_deviation) {
-		return p_mean + p_deviation * (cos(Math_TAU * randd()) * sqrt(-2.0 * log(randd()))); // Box-Muller transform
+		double temp = randd();
+		if (temp < CMP_EPSILON) {
+			temp += CMP_EPSILON; // To prevent generating of INF value in log function, resulting to return NaN value from this function.
+		}
+		return p_mean + p_deviation * (cos(Math_TAU * randd()) * sqrt(-2.0 * log(temp))); // Box-Muller transform.
 	}
 	_FORCE_INLINE_ float randfn(float p_mean, float p_deviation) {
-		return p_mean + p_deviation * (cos((float)Math_TAU * randf()) * sqrt(-2.0 * log(randf()))); // Box-Muller transform
+		float temp = randf();
+		if (temp < CMP_EPSILON) {
+			temp += CMP_EPSILON; // To prevent generating of INF value in log function, resulting to return NaN value from this function.
+		}
+		return p_mean + p_deviation * (cos((float)Math_TAU * randf()) * sqrt(-2.0 * log(temp))); // Box-Muller transform.
 	}
 
 	double random(double p_from, double p_to);