[x3d-public] X3D manual programming hanim motion.

[Joseph D Williams]

➢ Given the extreme craft needed for that class, there is no way we want to expose it to end users.

➢ … there is no way we want to expose it to end users

Do end users get cut off at some point? That means open development stops at some wall? 

In any open tool, even the most extreme coding used for implementation must be competently documented, with no black box code, for use by other open implementations. The ‘end user’ is, of course, us.

➢ add nodes and fields ... support needs to be included through manual programming.  

Please tell me more about this manual programming thing in hanim motion.

Thanks and Great thinking and work on all this,
Joe




From: Brutzman, Donald (Don) (CIV)
Sent: Thursday, January 17, 2019 5:28 AM
To: John Carlson
Cc: aono at tut.jp; X3D Graphics public mailing list
Subject: Re: [x3d-public] X3DGroupingNode interface has no method setIS inX3DJSAIL, FYI

On 1/14/2019 12:32 PM, John Carlson wrote:
> I there any desire to add methods on the fly in Java, instead of having them in a declared API?  See Java Proxy class.

Indeed there is a lot of capability in Java for this kind of thing, it's called reflection.  Proxy is part of that.

	The Java™ Tutorials ,Trail: The Reflection API
	https://docs.oracle.com/javase/tutorial/reflect

This is quite involved, both powerful and brittle if content being reflected into object classes and methods is imperfect.  I found the following book to be excellent and essential:

	Java Reflection in Action
	Ira R. Forman and Nate Forman, October 2004
	https://www.manning.com/books/java-reflection-in-action

Reflection is used in X3DLoaderObjectclass, which parses an XML document using DOM and then traverses to create X3DJSAIL objects.

	http://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/X3DLoaderObject.html

This was one of the harder parts of X3DJSAIL development.  I thought it was pretty good until we started pushing the 300+ X3D Examples Archives scenes through it, that uncovered a lot of overlooked cases which were then fixable.

As we add nodes and fields to X3Dv4 (such as HAnimMotion) support needs to be included through manual programming.  Given the extreme craft needed for that class, there is no way we want to expose it to end users.

That said, X3DJSAIL is strictly Plain Old Java Objects (POJO) so Java programmers can do anything they want.  X3D simply becomes a utility library capability.

Have fun with X3D and Java!

all the best, Don
-- 
Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu
Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman
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