Lua 5.3: integers, bitwise operators, and a basic UTF-8 library

Re:Lua 5.3: integers, bitwise operators, and a basic UTF-8 l... by JadeNB on Monday January 12, 2015 @08:43PM (#8877647)

When did you use quaternions? (Genuinely curious!)

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Re:Lua 5.3: integers, bitwise operators, and a basic UTF-8 l... by jws on Monday January 12, 2015 @10:40PM (#8878002)

Minecraft-like game I wrote with my daughter. I discovered their use the hard way after having suffered through without them. Any time you are freely rotating a viewpoint or an object in 3D space, you will probably want quaternions.

Do write some good test cases though that compare to someone else's implementation. I accidentally wrote my multiplication backwards and didn't catch it for a long time. I just had a vague feeling that something was wrong every time I wrote rotation code.

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Re:Lua 5.3: integers, bitwise operators, and a basic UTF-8 l... by kephra on Tuesday January 13, 2015 @08:06AM (#8879493)

Quarternions are much easier then the typical vector arithmetic, that is used by OpenGL ES.

Linden Scripting Language even provides quarternions conversion with llEuler2Rot, llRot2Euler and llAxisAngle2Rot. See: http://wiki.secondlife.com/wiki/Quaternion for an introduction.

So quaternions are useful for 3d games, and games are a hot topic for Lua. But its not required, that complex numbers or quarternions are part of base language. See: http://lua-users.org/wiki/ComplexNumbers - thats easy to implement with Lua prototyping.

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Re:Lua 5.3: integers, bitwise operators, and a basic UTF-8 l... by dottrap on Monday January 12, 2015 @09:13PM (#8877728)

Quaternions are pretty common in 3D graphics.

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