From b600b9949245296678bbc8f89bb3f6e4650371f9 Mon Sep 17 00:00:00 2001
From: Samuli Vuorinen <samuli.vuorinen@iki.fi>
Date: Fri, 7 May 2021 22:43:25 +0300
Subject: [PATCH] Fix incorrect crystal geometry

Two triangles in the crystal geometry used for raytracing were
incorrect, leaving two small holes in the crystal. This manifested as
slightly asymmetric brightness distribution of halos with Parry
crystals.
---
 CHANGELOG.md                                     | 2 ++
 src/haloray-core/resources/shaders/raytrace.glsl | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5092c2c..35d41e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,8 @@ and this project adheres to
 - Fixed bug where sky was shown a second time outside field of view with
   equidistant and equal area camera projections
 - Fixed missing prism face distances from save files
+- Fixed bug with slightly incorrect crystal geometry causing uneven brightness
+  distribution with Parry crystal halos
 
 ## 3.2.0 - 2021-03-24
 
diff --git a/src/haloray-core/resources/shaders/raytrace.glsl b/src/haloray-core/resources/shaders/raytrace.glsl
index 20da1b8..1d63cb8 100644
--- a/src/haloray-core/resources/shaders/raytrace.glsl
+++ b/src/haloray-core/resources/shaders/raytrace.glsl
@@ -130,11 +130,11 @@ ivec3 triangles[] = ivec3[](
     ivec3(15, 16, 10),
 
     // Face 7 (prism)
-    ivec3(10, 16, 17),
+    ivec3(10, 16, 11),
     ivec3(16, 17, 11),
 
     // Face 8 (prism)
-    ivec3(11, 17, 12),
+    ivec3(11, 17, 6),
     ivec3(17, 12, 6)
 );