From b0ed22e0ec1500d051d2410ce04129aa0e43c3eb Mon Sep 17 00:00:00 2001
From: Jacek Olszak <jacekolszak@gmail.com>
Date: Tue, 12 Feb 2019 21:00:05 +0100
Subject: [PATCH] #159 Simplify Matrix.Unproject formulas
---
geometry.go | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/geometry.go b/geometry.go
index e847b52..03b2fea 100644
--- a/geometry.go
+++ b/geometry.go
@@ -405,7 +405,7 @@ func (m Matrix) Project(u Vec) Vec {
func (m Matrix) Unproject(u Vec) Vec {
det := m[0]*m[3] - m[2]*m[1]
return Vec{
- m[3]/det*u.X - m[2]/det*u.Y + (m[2]*m[5]-m[3]*m[4])/det,
- -m[1]/det*u.X + m[0]/det*u.Y + (m[1]*m[4]-m[0]*m[5])/det,
+ (m[3]*u.X - m[2]*u.Y + m[2]*m[5] - m[3]*m[4]) / det,
+ (-m[1]*u.X + m[0]*u.Y + m[1]*m[4] - m[0]*m[5]) / det,
}
}
--
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