Issue with Adv. Twist Controls

[asataylor]

Do you have a parent or constraint between the chest control and the spline IK handle?

[anoopak]

hi there,
Since Y axis of your spine joints points towards the child, the up axis you specify should be either of the perpendicular axes.That is Y or Z.Note that Y is the aim axis not the up axis.
But in advanced twist you have the choice of either Y or Z.So in this case since Y is not available, and your Z is pointing in world Z direction.I assume your character is facing the positiveZ direction(Thats what I could read from the image,since the view axis is blocked by the outliner ) you have to set it to positiveZ and up vector and up vector 2 values to be 0 0 1 and 0 0 1.hope that helps

[JaredTaylor]

hi there,
Since Y axis of your spine joints points towards the child, the up axis you specify should be either of the perpendicular axes.That is Y or Z.Note that Y is the aim axis not the up axis.
But in advanced twist you have the choice of either Y or Z.So in this case since Y is not available, and your Z is pointing in world Z direction.I assume your character is facing the positiveZ direction(Thats what I could read from the image,since the view axis is blocked by the outliner ) you have to set it to positiveZ and up vector and up vector 2 values to be 0 0 1 and 0 0 1.hope that helps

I now have those exact settings, but he still doesn't twist! Could I send you the project file?

I tried making a parent constraint between the chest ctrl and IK handle but didn't help. Neither of the twist controls make the spine twist.

[anoopak]

hi,
This is a common problem that occurs when we choose Y-down for the spline ik joints.Anyways u can send me the files.Will have a look at it and help you out.

[tonytouch]

in order to use the advanced twist functions of the SPLINE_IK in maya , you NEED TO "orient your joints with X-axis as the AIM_axis" !!! else it won't work

in your case , you used the Y_axis .

[JaredTaylor]

in order to use the advanced twist functions of the SPLINE_IK in maya , you NEED TO "orient your joints with X-axis as the AIM_axis" !!! else it won't work

in your case , you used the Y_axis .

Thank you, that's all it took!

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