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#159 Simplify Matrix.Unproject formulas

This commit is contained in:
Jacek Olszak 2019-02-12 21:00:05 +01:00
parent 0aec9fead0
commit b0ed22e0ec
1 changed files with 2 additions and 2 deletions
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4
geometry.go
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@ -405,7 +405,7 @@ func (m Matrix) Project(u Vec) Vec {
func (m Matrix) Unproject(u Vec) Vec { func (m Matrix) Unproject(u Vec) Vec {
det := m[0]*m[3] - m[2]*m[1] det := m[0]*m[3] - m[2]*m[1]
return Vec{ return Vec{
m[3]/det*u.X - m[2]/det*u.Y + (m[2]*m[5]-m[3]*m[4])/det, (m[3]*u.X - m[2]*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[1]*u.X + m[0]*u.Y + m[1]*m[4] - m[0]*m[5]) / det,
} }
} }