Unity-like transform component

Davide · 2014-02-19T16:22:07

I'd like to implement a transform component just like Unity's transform, i.e. a transform hierarchy which allows rotation, translation and non uniform scaling stored as quaternions and vectors the task shouldn't be too hard, but there's an aspect i'm not sure of Unity allows programmers to access world position, rotation and scaling individually and i'm wondering what's a good way to implement this my naive solution would be just computing the 4x4 transform matrix through the hierarchy and decompose it somehow (polar decomposition or singular value decoposition should do the job i think but i don't know much about this yet) however, this way i would not make use of the decomposition i already have for each transform in the hierarchy so i wonder if there's some way to do it faster

Math and Physics Programming

Started by tuccio February 02, 2014 07:14 PM

9 comments, last by cadjunkie 10 years, 1 month ago

cadjunkie

1,893

February 19, 2014 04:22 PM

I've never messed around with Unity, but I would store the world rotation matrix separately and postmultiply the rotation component matrix onto the world rotation matrix before drawing (Rot * World = MV). If I need to rotate in the world coordinate frame, I could premultiply the rotation matrix with the new matrix ([Rot * NewWorld] * World = MV). If I need to multiply in the local frame, I would postmultiply ([NewLocal * Rot] * World = MV).

Hope that helps spark discussion.

Unity-like transform component

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Unity-like transform component

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