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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hi Don,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I note that in X3DJSAIL you have a “setUSE” method defined in all node classes. I don’t see any point of having this method.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My thinking is as follows. Please correct it as necessary.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>X3DJSAIL is meant to be an interface for an implementation of the Java Language binding – ISO/IEC 19777-2.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The SAI 19775-2 has no service related to “USE”. So it does not appear in the Java language binding.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Consider that an instance of a node (say Material) has been loaded into memory and added into a scene. Then consider that further down in the scene it is desirable to implement a “USE”. What are the steps?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The first would be to call the Java implementation of the SAI execution context service “getNode”, with the SAIString parameter set to the DEF name, and the SAIAction parameter set to DEFNode. In the standard ISO/IEC 19777-2 V3.0, clause 6.4.6 getNode the defined method is getNamedNode. What is your equivalent function in X3DJSAIL?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Having obtained a node reference for the DEF’d node, let’s assume you also have a node reference for the node that is to be the parent of the USE node, which I will assume for this example will be Appearance. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>You now need to obtain a reference for the “material” field of the Appearance node. We need to use the SAI service getField, defined in 6.6.4 getField in ISO/IEC 19775-2. The Java language binding lists this as getField in clause 6.6.4 of ISO/IEC 19777-2. What is your equivalent function in X3DJSAIL?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Now that we have the field reference, and the node reference to add, we can finally make a call to the SAI service setValue, defined in 6.7.6 setValue in ISO/IEC 19775-2. The Java language binding lists this as setValue in 6.7.6 of ISO/IEC 19777-2. What is your equivalent function in X3DJSAIL?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Final comments relate to garbage management. The implementation will probably want some way to remember that the same node reference has been used in multiple places. That is something internal to the implementation, and not anything for the interface.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So, in conclusion, I don’t see a need for your setUSE method. And it is not in the SAI.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>All the best,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Roy<o:p></o:p></p></div></body></html>