Improve plummer distribution generation

Src/Files/FGenerateDistribution.hpp

@@ -259,15 +259,17 @@ FReal plummerDist(FSize& cpt, const FReal &R) {
  */
 template <class FReal>
 void unifRandomPlummer(const FSize N, const FReal R, FReal * points) {
-    constexpr const FReal rand_max = 0.995;
+    constexpr const FReal rand_max = 0.8;
     constexpr const FReal r_max = std::sqrt(1.0/(std::pow(rand_max, -2.0/3.0) - 1.0));
     std::cerr << r_max << '\n';
 
     unifRandomPointsOnSphere<FReal>(N, 1, points);
     FReal mc = 1.0/static_cast<FReal>(N);
     for (FSize i = 0, j = 0 ; i< N ; ++i, j+=4)  {
-    	FReal m = getRandom<FReal>();
-        m = m > rand_max ? rand_max : m;
+        FReal m = getRandom<FReal>();
+        while(m > rand_max) {
+            m = getRandom<FReal>();
+        }
     	FReal r = FMath::Sqrt(1.0/(FMath::pow(m, -2.0/3.0) - 1.0)) / r_max;
         points[j]    *= r;
         points[j+1]  *= r;