how to get bone tip position?

[Ryan0805]

Hi,

my problem is similar to this post: viewtopic.php?t=49689



I can get bone's position using _getDerivedPosition() function. However, I can't get the tip position since bone3 doesn't have child bone.

Is there a way to get the position of the tip?

Thank you.

[dark_sylinc]

I can get bone's position using _getDerivedPosition() function. However, I can't get the tip position since bone3 doesn't have child bone.

Is there a way to get the position of the tip?

That information is lost because it is not exported. Only the head's data is exported.

You can assume the bone to be of a certain size (e.g. 1 unit) and see if it has been preserved through scale: e.g.

Code: Select all

pos = bone3->_getDerivedPosition();
rot = bone3->_getDerivedOrientation();
scale = bone3->_getDerivedScale();

tip = pos + rot * scale.z;

But I can't guarantee this will get you the same exact result as what you are seeing in Blender/Maya/etc. The orientation will be correct but how large the bone is may be wrong.

[Ryan0805]

I see. i'll get the scale factor in Blender.

Thank you!

[dark_sylinc]

Btw a much better workaround would be to create a dummy child node; since the child's head is essentially the parent's tip

[Ryan0805]

Code: Select all

Bone *dummy = bone3->createChild(handle, translate, rotate);

Yeah but creating dummy child need translate vector relative to bone3.
So I still need to get the scale factor in Blender. Or am I using the wrong function?

[dark_sylinc]

I meant creating a child bone in Blender