From d27f628527cc432f7b1fce7a8dc5d71a5556d31d Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 18 Aug 2019 21:31:27 +0200
Subject: [PATCH] adjust number of levels drawn

---
 nonisotropic.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/nonisotropic.cpp b/nonisotropic.cpp
index 1ca18d4d..c3f4eabb 100644
--- a/nonisotropic.cpp
+++ b/nonisotropic.cpp
@@ -617,7 +617,15 @@ EX namespace product {
   
   void drawcell_stack(cell *c, transmatrix V, int spinv, bool mirrored) {
     if(sphere) gmatrix[c] = V; /* some computations need gmatrix0 for underlying geometry */
-    in_actual([&] { for(int z=-5; z<=5; z++) drawcell(get_at(c, current_view_level+z), V * mscale(Id, cgi.plevel * z), spinv, mirrored); });
+    in_actual([&] { 
+      int flat_distance = hdist0(product_decompose(tC0(V)).second);
+      int max_z = flat_distance > sightranges[gProduct] ? 0 : sqrt(sightranges[gProduct] * sightranges[gProduct] - flat_distance * flat_distance) + 1;
+      for(int z=-max_z; z<=max_z; z++) {
+        cell *c1 = get_at(c, current_view_level+z);
+        setdist(c1, 7, NULL);
+        drawcell(c1, V * mscale(Id, cgi.plevel * z), spinv, mirrored); 
+        }
+      });
     }
   
   void find_cell_connection(cell *c, int d) {