Part of mesh randomly disappears

[lexferreira89]

Hi,

When playing the game or simply opening a scene with jigglebones, it's common for the part of the mesh affected by the jigglebone to disappear, causing the console to throw the following errors continuously until the game/scene is closed:

The axis Vector3 must be normalized
core/math/basis.cpp:69 - Condition "det == 0" is true

Does anyone have any idea on how to solve this?
I'm using Hasenn's fork, by the way.

[lexferreira89]

According to the errors shown when playing the game, it seems the lines causing this problem are:
var bone_new_transf_obj = Transform(bone_transf_obj.basis.rotated(bone_rotate_axis_obj, bone_rotate_angle), bone_transf_obj.origin)

And maybe either this one:
var diff_vec_local = bone_transf_world.affine_inverse().xform(global_transform.origin).normalized()
Or this one:
var bone_rotate_axis = bone_forward_local.cross(diff_vec_local)

[bengtsts]

The issue may be an invalid Vector3. Try adding:

func _process(delta):
	if is_nan(global_transform.origin[0]) or is_nan(prev_pos[0]):
		global_transform = Transform()
		prev_pos = global_transform.origin[0]

If that works, all credit to this guide!