X3D: PROTO converted from VRML not working - x3d

Question

I have a VRML code I want to convert to X3D. The code should define spheres with different radius and colors to later instantiate by giving the coordinates as an argument.
First, I used an online converter suggested in another question, then opened it in blender to check it but it only displays one sphere instead of the 4 it's supposed to. I compared it with other similar examples found by googling and I don't see any difference or clue as to why it does this. I've tried changing some fields so it looks more like the examples: field accessType to initializeOnly, the information inside <X3D ...> to profile="Interchange" version="3.2" xmlns:xsd="http://www.w3.org/2001/XMLSchema-instance" xsd:noNamespaceSchemaLocation="http://www.web3d.org/specifications/x3d-3.2.xsd". I also tried placing <Shape> inside <children> like in VRML but in all cases it displays just one sphere.
This is a simplified version of the VRML code I want to convert to x3d:
#VRML 2.0 utf8
PROTO Copper [ exposedField SFVec3f xyz 0 0 0 ] {
Transform {
translation IS xyz
children [
Shape {
appearance Appearance {
material Material { diffuseColor 0.78 0.5 0.2 }
}
geometry Sphere { radius 1.32 }
}
]
}
}
Copper { xyz 0.0 0.0 0.0 } # 0
Copper { xyz 0.0 1.8 1.8 } # 1
Copper { xyz 1.8 0.0 1.8 } # 2
Copper { xyz 1.8 1.8 0.0 } # 3
This is what I get from the converter:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.0//EN" "http://www.web3d.org/specifications/x3d-3.0.dtd">
<X3D xmlns:xsd='http://www.w3.org/2001/XMLSchema-instance' profile='Full' version='3.0' xsd:noNamespaceSchemaLocation='http://www.web3d.org/specifications/x3d-3.0.xsd'>
<Scene DEF='scene'>
<ProtoDeclare name='Copper'>
<ProtoInterface>
<field accessType='inputOutput' name='xyz' type='SFVec3f' value='0 0 0'/>
</ProtoInterface>
<ProtoBody>
<Transform>
<Shape>
<Appearance>
<Material diffuseColor='0.78 0.5 0.2'/>
</Appearance>
<Sphere radius='1.32'/>
</Shape>
<IS>
<connect nodeField='translation' protoField='xyz'/>
</IS>
</Transform>
</ProtoBody>
</ProtoDeclare>
<Copper xyz='0.0 0.0 0.0'/>
<Copper xyz='0.0 1.8 1.8'/>
<Copper xyz='1.8 0.0 1.8'/>
<Copper xyz='1.8 1.8 0.0'/>
</Scene>
</X3D>

Answer 1

Unfortunately, it looks like a bug in the Blender X3D importer, because the following shows four spheres (as expected) in the BS Contact viewer, yet only one sphere in Blender:
<?xml version="1.0" encoding="UTF-8"?>
<X3D profile="Immersive" version="3.0">
<Scene>
<ProtoDeclare name="Copper">
<ProtoInterface>
<field accessType="inputOutput" name="xyz" type="SFVec3f"/>
</ProtoInterface>
<ProtoBody>
<Transform translation='0 0 0'>
<Shape>
<Appearance>
<Material diffuseColor='0.78 0.5 0.2'/>
</Appearance>
<Sphere radius='1.32' />
</Shape>
<IS>
<connect nodeField="translation" protoField="xyz"/>
</IS>
</Transform>
</ProtoBody>
</ProtoDeclare>
<Copper />
<Copper xyz='0 1.8 1.8' />
<Copper xyz='1.8 0 1.8' />
<Copper xyz='1.8 1.8 0' />
</Scene>
</X3D>