Jacky Rymasz wrote:
I tried the "hello world" example from
http://www.web3d.org/TaskGroups/x3d/translation/examples/HelloWorld.html
Here the code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE X3D PUBLIC "+//Web3D//DTD X3D 3.0 Interactive//EN"
"http://www.web3d.org/specification/x3d/x3d-3.0.dtd";>
<X3D profile='Interchange'>
<head>
<component name='helloComponent' level='1'/>
The problem is this bit. It's wrong. Quite franky, I would not trust
_anything_ in those examples they're all wrong and far from spec
compliant, even within the latest draft specs.
Firstly, all those examples have the wrong PUBLIC ID. Next, the name
attribute of the component must be one of the component names defined in
the X3D specification. The FCD draft that was sent to ISO a week or so
ago can be found here:
http://www.web3d.org/TaskGroups/x3d/x3d_spints.html
This is only the abstract specification, but it should at least give you
the formal names of all of the components.
After removing all the <meta> tags I had to add "" to the description of
the Viewpoint ('"hello, world!"') and the type of the NavigationInfo
('"EXAMINE ANY"')
I had to remove the <NavigationInfo> tag because the navigation state was
unknown.
Correct. This is another error in the examples. The type attribute is an
MFString,
which means when you want to provide more than one value, you need to
quote each
string separately in the attribute value. Right now, the way that
example is written the type attribute has the value "EXAMINE ANY", which
is not valid. What you really need to say is "EXAMINE" "ANY", so the
real navInfo should be:
<NavigationInfo type='"EXAMINE" "ANY"'/>
I also had to change the X3D profile to "Immersive" to get the <Text>
working.
Correct. Text doesn't appear until that profile. If you wanted to
include the
text component and use a lower profile, you can use the <component> tag
like you
saw in the above example.
Finally I got a white sphere with the text under it but I got this
Exception:
Warning: IO Error reading external file http://www.web3d.org
:80/TaskGroups/x3d/translation/examples/earth-topo.png
www.web3d.org
java.net.UnknownHostException: www.web3d.org
Eeeck. Were you connected to the internet at the time you did this?
Nothing we can really do about that :(
Are the dtds int the DTD rep of Xj3D the correct version???
The version of the x3d-3.0.dtd is:
# current version: 0.9.19
#
# revised: 31 December 2002
Yes - they are the last published ones. There's a couple a little later
than that, but mainly tweaking bits - nothing structural.
I install the X3D examples (on the root c:\) and I got the Exception:
org.web3d.vrml.lang.VRMLException: SAX Error: org.xml.sax.SAXException:
URI=null Line=2: URI relative
"/www.web3d.org/TaskGroups/x3d/translation/x3d-3.0.dtd";
See the comment in an earlier mail about having the classpath set
correctly so that we can resolve them. This error is from the HTML error
page that is being returned by the web3d.org server.
--
Justin Couch http://www.vlc.com.au/~justin/
Java Architect & Bit Twiddler http://www.yumetech.com/
Author, Java 3D FAQ Maintainer http://www.j3d.org/
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Neither man nor woman is the measure of all things. Every organism
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- Greg Bear, Slant
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