edit *.wrl file, add a new node

2014 6 5
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更新时间：2014 6 17
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I tried to add a new transform node in my virtual world object. With Matlab function vrnode I have been able to obtain the handle and set some of existing field of the virtual world object. I am wondering HOW can I add a new transform node under the existing transform node via Matlab directly without manipulating the raw *.wrl file.
Below is the list of fields available. It seems to be that the addChildren field here shall add a new child node to the existing node, so I tried syntax to use the addChildren field, but none of them works. Is it possible? Below is the list return by fields function.
Thank you.
Field Access Type Sync
-----------------------------------------------------------
addChildren eventIn MFNode off
removeChildren eventIn MFNode off
children exposedField MFNode off
center exposedField SFVec3f off
rotation exposedField SFRotation off
scale exposedField SFVec3f off
scaleOrientation exposedField SFRotation off
translation exposedField SFVec3f off
bboxCenter field SFVec3f off
bboxSize field SFVec3f off

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Jan Houska
Jan Houska 2014-6-6

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Hi Steven,
as the parent field, you should use the children field, not addChildren, which is an event. Like in the following code snippet, based on the shipping vrbounce example:
w = vrworld('vrbounce');
open(w);
parenttransform = w.Ball;
newtransform = vrnode(parenttransform, 'children', 'NewTransform', 'Transform')

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Steven
Steven 2014-6-9
Thanks. I finally created one. BUT the new transform does not apply on the object when I pass new rotation parameter to it. The original object transform node does control the rotation and translation perfectly, but the new sub-node doesn't seem to control anything. Did I put it under the wrong parent node? The reason I implemented these code is because I want to make a multi-rotation of a object toward two axes.
Thanks
Jan Houska
Jan Houska 2014-6-10
Transforms apply only to their children. They do not apply to their siblings. So if you have created the new transform as a sibling of some existing nodes, it would not apply to them.
BTW, have you tried the interactive 3D World Editor? It shows you the effects of your changes immediately and gives better understanding of what's going on when you add a node. You can then always return back to command line if you prefer.
Steven
Steven 2014-6-17
Thank you so much. I finally figure out how it works.

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