Game Editing > 3D Modeling & Content Creation

blender quaternion rotations or eulers?

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ratty redemption [RIP]:
i've finished my rig for now and am starting to set up various poses in the action editor. i've just noticed i can either rotate bones using quaternions or eulers. the results look the same to me, so is there any advantage to either of them? would it affect exporting to a game engine in the future? currently i'm only working on non real time rendering the when the animations are ready.

nemyax:
Eulers
Pros:
- Easy to understand
- Manually editing individual components is intuitive
Cons:
- May not produce the smoothest rotation possible
- Prone to gimbal lock (look it up) — a condition where two axes begin to point the same way, and a degree of freedom is lost

Quaternions
Pros
- Always produce perfectly smooth rotations
- Never have gimbal lock problems
Cons
- Not really editable manually in any meaningful way
- You can't reliably read timing and spacing off them

> would it affect exporting to a game engine in the future?
It doesn't matter. They are mutually convertible, and whichever your engine needs will end up in the exported file.

> is there any advantage to either of them?
This depends on how heavily you rely on the animation curve editor. If you like fiddling with curves, you're better off with Eulers and a carefully chosen and tested rotation order. Otherwise, you can safely use quats. In addition, you can use a mixed setup.

kat:
Are you talking about the below Ratty ("body" bone expanded in the Action Editor to show the various animation data 'channels' available)?

ratty redemption [RIP]:
thanks a lot guys, the difference between quats and eulers makes sense to me now.

so far with my blender animations, i've been using the graph editor a lot for animating objects like cameras, mesh shape keys or material properties, as their relatively simple key frames can be easily read in the graph editor. the quats i didn't understand at all, but i've just looked up on wikipedia and they also mentioned 4 rotational axis (which apparently quats use) prevent gimbal lock and as nemyax listed, produce smoother rotations.

i'm new to rigging and animating armatures, so i think i'll use quats when keyframing bones in the dopesheet and action editor, and eulers if i intend to tweak the curves in the graph editor.

ratty redemption [RIP]:
i'm curious, is there a way in blender for us to manually convert quats into eulers? i've looked but not found anything yet. i understood nemyax said they are converted by the exporters or game engines, but can we convert them before exporting?

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