From bc102b000d6f495e1445344232666e0dcea2b85d Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sat, 14 Nov 2020 14:43:14 +0100
Subject: [PATCH] fixed camera not rotating in Nil shmup

---
 hypgraph.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hypgraph.cpp b/hypgraph.cpp
index c5ab4895..e17a21eb 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -1653,7 +1653,11 @@ EX void centerpc(ld aspd) {
     transmatrix T = pc->at;
     int sl = snakelevel(cwt.at);
     if((sl || vid.eye) && WDIM == 2) T = T * zpush(cgi.SLEV[sl] - cgi.FLOOR + vid.eye);
-    View = iso_inverse(T);
+    /* in nonisotropic geometries, T is isometry * rotation, so iso_inverse does not work */
+    if(nonisotropic)
+      View = inverse(T);
+    else
+      View = iso_inverse(T);
     if(prod) NLP = ortho_inverse(pc->ori);
     if(WDIM == 2) rotate_view( cspin(0, 1, M_PI) * cspin(2, 1, M_PI/2 + shmup::playerturny[id]) * spin(-M_PI/2) );
     return;