Auto-Rig Pro Documentation

Frequently Asked Questions

Click a question to show the answer.


General Information

  • What can I rig with it?

  • It’s meant to rig any stylized or realistic character, based on bipeds/m-peds bone structure : humans, cats, dogs, centaurs, spiders... On the contrary, rigging a snake is not supported by this tool!
    Bird feathers are not yet included, however you can add your custom over it if you know the principles of rigging. Or use the hand fingers to this aim.
  • How does the auto-detection work, what limitations?:

  • It works for biped characters only, the model must be in T-Pose (45° tolerance for the arms orientation, however it works best with the arms, hands and fingers horizontally aligned). It detects the feet, legs, spine, arms, fingers position. Depending on the character, some manual correction may be required. The facial bones (mouth, eyelids, eyebrows...) are not yet supported, they have to be positionned manually.
    The algortihm finds the vertices in the markers neighbourhood, compute the depth, position of each part, then analyze the datas to place the bone according to the standard human proportions. And if the model is too special and does not meet these requirement, you can skip the auto-detection feature and simply place the reference bone manually.

  • Does it include bendy bones?

  • Bendy bones are an amazing tool! So far, I think only Blender has this feature. They're currently used to handle the neck twist deformation.
    But the first reason I prefer not to use them for facial rigging, is the control restriction. It's not yet possible to move the sub-bones in all axes directions, and the scale is limited too.
    The second reason is they're not exportable to other game engines.

Technical Problems

Skinning

  • Clicking Match to Rig leads to an error / The mesh blowns up after clicking Bind

  • Make sure auto-run python scripts is enabled in the preferences (Ctrl-Alt-U > File) or 'Trusted Source' when loading the file. Some dependencies such as drivers and scripts execution rely on it.

    autorun autorun2

  • The Bind button doesn't work, the model does not follow the controllers motions

  • Unfortunately, there are a few cases where the binding may fail. This is due to the current limitation of the Blender automatic weight solver. Hopefully there are workarounds to get it work perfectly. Unbind the character, try one of the following, and bind again.

    • Enable Split Parts: Meshes made of multiple non-connected pieces (clothes, teeth, eyes...) may skin poorly/not at all if Split Parts is not enabled.

      split

    • Unit scale: Try to scale up the character and armature (S key, then type numpad 10 to scale ten time bigger), bind the mesh, then scale it down (S key, type numpad 0.1) to reset to the inital scale.

    • Coordinates are not initialized: Make sure you initialized the mesh rotation and position by pressing Ctrl-A

    • Non-manifold vertices : Make sure the mesh has no serious deficient topology by pressing Shift-Ctrl-Alt-M to select the non-manifold vertices. If you can see a lot of vertices selected all around the mesh (excluding boundaries), perform a 'Remove Double' by pressing W > Remove Double.

    • The mesh contains custom normals: Imported files (.obj, .fbx) may contain complex/dirty normal datas that the binding solver does not appreciate. Delete them and select all vertices, Ctrl-N to recalculate the normals.

      custom_nor

    • Others : If it still doesn't work, as weird as it may sound, the mesh is likely subject to an unindentified internal Blender bug that can be strangely fixed by adding a subsurf modifier. Add the subsurf modifier (level 1 is fastest), bind the mesh then delete the modifier.


  • Something went wrong when skinning, it's not smooth at all...

  • When using very high poly meshes (~80.000 faces) the Blender automatic weight solver may become slightly buggy on the edges...
    A simple way to fix this is switching to Weight Paint mode, and add a little negative level offset to the weight groups. And if more accuracy is needed, just paint over the automatic weights.

    weight_level_fix

Rig Definition

  • I don't need some specific bones, can I delete them?

  • If disabling a full limb doesn't give you enough precision to disable a specific bone, hide the bones you don't need (H key) but don't delete them, it would lead to the addon malfunction. Then just delete the vertex groups of the hidden bones to make them ineffective.

    To hide the IK and FK bones, delete the driver from the checkbox first:

    hide_arms_legs

Smart feature

  • The markers are invisible?

  • Make sure the scene units are set to 1.0 scale. You'll be able to change it later (e.g. Unreal export) but the smart feature only works with 1.0 scale units.

Game Engine Export

  • When switching to Unreal units, the legs are broken?

  • unit_bug

    Due to the an imprecision of the IK stretch calculation, Blender does not handle well big models, whose scale are multiplied by 100 when switching to Unreal Engine units. Unfortunately, after many trials, there's nothing I can do on my side (addon code) to prevent it. The bug has been reported and hopefully and will be fixed someday.
    As a workaround, before clicking UE Units just make sure to scale the armature and mesh objects together so that they're not bigger than the standard grid floor, in Blender units.

    unit_bug

Auto-Rig Pro addon for Blender.
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