From 2eb5faa1fe73793fdf206105d8f8a7d3b7278113 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 16 Nov 2021 00:37:46 +0000
Subject: Transform obj to ILT was a static mat4

---
 gfx/models/obj.impl.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'gfx')

diff --git a/gfx/models/obj.impl.cpp b/gfx/models/obj.impl.cpp
index 0701d13..02996da 100644
--- a/gfx/models/obj.impl.cpp
+++ b/gfx/models/obj.impl.cpp
@@ -17,8 +17,13 @@ ObjParser::ObjParser(std::unique_ptr<std::istream> in) : yyFlexLexer(in.get())
 	ObjParser::yylex();
 	assert(in->good());
 	std::for_each(vertices.begin(), vertices.end(), [](auto & v) {
-		std::swap(v.y, v.z);
-		v.x = -v.x;
+		constexpr const glm::mat4 obj2ilt {
+				-1, 0, 0, 0, // x
+				0, 0, 1, 0, // y
+				0, 1, 0, 0, // z
+				0, 0, 0, 0, // w
+		};
+		v = v * obj2ilt;
 	});
 }
 
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