Missing Feature : supporting Parent to Bone (in blender) as AttachmentNode (in jme)

[Ali-RS]

Hi
In blender we can set an specific bone to be the parent of one or many objects (Ctr+P --> parent to bone) which is the same as setting an object to a bone AttachmentNode in jme.
So is it good idea to support this and make the life a bit easy ?

[davidB]

Before response, I need to understand it (usage, use case,...). I never use it.
Today in blender, iirc, I already use parent to bone to link skeleton to model.

[Ali-RS]

Use Case : for example connect sword to hand of warrior so that sword will swing by his hand movement.

I tried it but it did not connect. Let me try it one more time.

[davidB]

So attachment is for runtime, not for design/modeling time ?

[Ali-RS]

Yes , attaching is for runtime but before then I need to add some place holder Node (By place-holder i mean a node with a local translation inside bone attachment node) in design time so that for example all knifes (which are small) should have a place-holder node for of type knife, an other place holder node for type sword (which are big) which any weapon of type sword will be attached to it and so on ...
this will help manage local translation of attachments inside bone attachment node.
Could i explain the idea ?

Edit : I can do it in code with some default translation but i like to concentrate all of these works on blender and try not to hard-code them. And by simply transforming that place-holder node in blender i can change where the attachments will be added.

[Ali-RS]

Tested it once more :
I am attaching the cube to arm bone of model using [Ctr+P --> Bone] in blender

As you see in the picture in jme side it is just attached to node "Armature" (root node of model) as child which is wrong and it should be added to bone attachment node.

it supposed to be like this. I am attaching box to bone attachment node in SDK.

[Ali-RS]

Parent type should be considered when exporting object relation :

[davidB]

Thanks for all the info (again). I agree providing support for attachment
should be added (I but I don't know when and how, I'll also check how
assimp manage it).

On Tue, Aug 2, 2016 at 9:10 AM, Ali-RS notifications@github.com wrote:

Parent type should be considered when exporting object relation :
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https://cloud.githubusercontent.com/assets/5787647/17319861/d4366c52-58a5-11e6-8033-bf8fc97a427e.png

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[Ali-RS]

thanks

was looking to codes.
May be there is need to add new linker for this. kind of a NodeToBone linker or use the existing NodeToNode linker (attachment node itself is an instance of Node class in jme).

[Ali-RS]

I can add a test case for this in xbuf_unittest.blend file, if you want.
Anyway, you can count on me for any testing and providing information of how things work in blender side and jme side.

[Ali-RS]

here is how to set rotation,transform of attachments in jme side to get the result same as it looks in blender:
Parent to bone in blender :

and Parent to bone in jme using attachment nodes: (the scene and cube loaded directly from blender)

for getting the same result in jme, i need to :

            Vector3f world=cube.getWorldTranslation();
            Vector3f local=new Vector3f();
            attachmentNode.worldToLocal(world, local);
            attachmentNode.attachChild(cube);
            cube.setLocalTranslation(local);
            Quaternion q=attachmentNode.getLocalRotation(); 
            q.inverseLocal();  
            cube.setLocalRotation(q);

hope it helps

So for loading in JME side we will have no problem 😃