From 0d3e2e5b91129249849cb4b48ed1631a5eed02ba Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Mon, 10 Feb 2020 13:53:50 -0500
Subject: Fixed bug in generator of reflections, now actually reflects near
 centers.

---
 spheres_infinite.cpp | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/spheres_infinite.cpp b/spheres_infinite.cpp
index dba7ab3..9bc86d7 100644
--- a/spheres_infinite.cpp
+++ b/spheres_infinite.cpp
@@ -73,18 +73,18 @@ std::function<Euclidean<double, D>(const model&, randutils::mt19937_rng&)> eGen(
     Matrix<double, D> m;
 
     double θ = rng.uniform((double)0.0, 2 * M_PI);
-    m(0, 0) = cos(θ);
-    m(1, 1) = cos(θ);
-    m(0, 1) = sin(θ);
-    m(1, 0) = -sin(θ);
+    m(0, 0) = -cos(2 * θ);
+    m(1, 1) = cos(2 * θ);
+    m(0, 1) = -2 * cos(θ) * sin(θ);
+    m(1, 0) = -2 * cos(θ) * sin(θ);
 
     unsigned f_ind = rng.uniform((unsigned)0, (unsigned)M.s.size());
-    t = M.s[f_ind].x;
+    t =  M.s[f_ind].x;
     for (unsigned j = 0; j < D; j++) {
-      t(j) = rng.variate<double, std::normal_distribution>(0.0, ε);
+      t(j) += rng.variate<double, std::normal_distribution>(0.0, ε);
     }
 
-    Euclidean<double, D> g(t, m);
+    Euclidean<double, D> g(t - m * t, m);
     return g;
   };
 }
@@ -145,7 +145,7 @@ int main(int argc, char* argv[]) {
     return H * s.x.norm();
   };
 
-  auto g = eGen(0.25);
+  auto g = eGen(0.05);
   animation A(L, 750, argc, argv);
   model sphere(1, Z, B);
 
-- 
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