From 33380fba896abf6cf0ff92290b926e9fd270a96f Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Thu, 15 Dec 2022 18:59:20 +0100
Subject: [PATCH] noniso skies

---
 drawing.cpp | 2 +-
 sky.cpp     | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drawing.cpp b/drawing.cpp
index cd48ecd9..48c7a7d7 100644
--- a/drawing.cpp
+++ b/drawing.cpp
@@ -2456,7 +2456,7 @@ EX void drawqueue() {
   #endif
 
   #if MAXMDIM >= 4 && CAP_GL
-  if(embedded_plane && (hyperbolic || geom3::sph_in_euc()) && !vrhr::rendering()) make_air();
+  if(embedded_plane && (hyperbolic || geom3::sph_in_euc() || geom3::euc_in_noniso() || geom3::hyp_in_solnih()) && !vrhr::rendering()) make_air();
   #endif
   
   #if CAP_VR
diff --git a/sky.cpp b/sky.cpp
index 5eb23042..32ba84c2 100644
--- a/sky.cpp
+++ b/sky.cpp
@@ -69,7 +69,9 @@ EX void delete_sky() {
 void compute_skyvertices(const vector<sky_item>& sky) {
   skyvertices.clear();
   if(!draw_sky) return;
-  if(vid.wall_height < 0 && geom3::euc_in_hyp()) return; /* just looks bad */
+  if(vid.wall_height < 0 && geom3::euc_in_hyp()) return; /* just looks bad, hollow horospheres should not have sky */
+  if(vid.wall_height < 0 && meuclid && geom3::ggclass() == gcNIH) return; /* same */
+  if(among(geom3::ggclass(), gcSol, gcSolN)) return;  /* errors */
 
   int sk = get_skybrightness();