Odd Attach Behaviour


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By Lord Ashes - 8 Years Ago
I have a boned object...call it a plank. It has about 15 bones allowing it to be bent at various stages of its length.
When I bring this object into iClone (via 3DXChange), I am able to access the bones, as expected, to bend the plank.

The issue that I am having is that when I create a couple of boxes in iClone (later to become dummy boxes) and attach them to the bones on either end of the plank, bending the plank causes the boxes to move in the opposite direction than I would expected. I would expect the boxes to move with the bone but that is not what I am getting, they move in the opposite direction. See video for actual results.



Any ideas why I am getting this result? The weight paint on the plank is very simple with each bone contributing to only its section of the plank. It was generated by Blender using the Automatic Weight maps. The weight maps see to work since you can see the plank bending correctly. To attach the boxes, I use the iClone ATTACH option, specifying the bone (as opposed to the object).
By 3DPiXL - 8 Years Ago
Looks like you coordinates are reversed, make sure you match the x,y & z when you import/export.
By Lord Ashes - 8 Years Ago
JaffaDave (6/2/2017)
Looks like you coordinates are reversed, make sure you match the x,y & z when you import/export.


Match coordinates with that? The plank is imported via 3DXChange but the boxes are iClone boxes.
By 4u2ges - 8 Years Ago
You sure, you did not attach boxes to the opposite end bones? :)
By wires - 8 Years Ago
The writing style of the "Proud Farter" seems very much like that of someone long gone from the Forum. :Whistling:;):w00t: 
By Lord Ashes - 8 Years Ago
4u2ges (6/3/2017)
You sure, you did not attach boxes to the opposite end bones? :)

I don't believe so. I attached them by picking the parent and then working down that parent to the specific bone.
However, in either case even if the bone was wrong the boxes should not go up since all bones that are being bent (some are not) are being bent down.
By Lord Ashes - 8 Years Ago
ifartproudly (6/3/2017)
JaffaDave is correct.
The box and bone (Local Oriientation) have different axis.
Make sure (Before Attaching) that the boxes and bones have the same local orientation.

I'm trying to follow what you are saying but it still isn't completely clear. The prop (not character) was built in Blender and then imported into iClone via 3DXChange. The boxes were created in iClone. Where would I set either of the axis settings that you refer to?
By 4u2ges - 8 Years Ago
Lord Ashes (6/4/2017)
4u2ges (6/3/2017)
You sure, you did not attach boxes to the opposite end bones? :)

I don't believe so. I attached them by picking the parent and then working down that parent to the specific bone.
However, in either case even if the bone was wrong the boxes should not go up since all bones that are being bent (some are not) are being bent down.


Boxes would indeed go up because the bone is rotating and so does attached box - right bone clockwise and left counter clockwise.
That was the reason made me think you have attached it in reverse.