[x3d-public] Behavior of X3D's DOM integration

[Behr, Johannes]

> <Group>
>    <Shape DEF="A">
>      <Sphere>
>      <Appearance DEF="red">
>        <Material diffuseColor='1.0 0.0 0.0'/>
>      </Appearance>
>    </Shape>
>    <Shape DEF="B">
>      <Box/>
>      <Appearance USE="red"/>
>    </Shape>
> </Group>

 
> On 16 Apr 2015, at 10:11, Kristian Sons <kristian.sons at dfki.de> wrote:
> 
> Hi Johannes,
>>> >Using Johannes approach, one would circumvent this. On the other hand this would result in some magic transforming the DOM at other places if the user deletes or adds a node. I would find this very counterintuitive.
>> For me DEF/USE is really just a serialisation construct to map the graph to a tree and therefore two pointer to the same node which should behaviour exactly the same. According to the spec the node is the same. Deep-copies are done with Proto-instances. Therefore this should work:
>> 
>> 1) Create to shapes (A,B) which share the material
>> 2) Delete one shape (A)
>> 3) (B) should still work with the given material in the setup state
> 
> I absolutely see your point, this is how X3D works. However with your example above in the DOM starting from this:
> 
> <Group>
>    <Shape DEF="A">
>      <Sphere>
>      <Appearance DEF="red">
>        <Material diffuseColor='1.0 0.0 0.0'/>
>      </Appearance>
>    </Shape>
>    <Shape DEF="B">
>      <Box/>
>      <Appearance USE="red"/>
>    </Shape>
> </Group>

If you interpret the DOM traversal as scene serialisation:

<Group>
   <Shape DEF="B">
     <Box/>
     <Appearance DEF="red">
       <Material diffuseColor='1.0 0.0 0.0'/>
     </Appearance>
   </Shape>
</Group>

This is exactly what aopt does if you delete A.

aopt -i in.x3d -d “A” -x out.x3d

best regards
johannes

> 
> How would the DOM look like after deleting Shape#A?
> 
> Best,
>  Kristian
> 
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---
Dr. Johannes Behr
Visual Computing System Technologies
Fraunhofer IGD
Fraunhoferstr. 5  |  64283 Darmstadt  |  Germany
Tel +49 6151 155-510  |  Fax +49 6151 155-196
johannes.behr at igd.fraunhofer.de  |  www.igd.fraunhofer.de/vcst