Warren, please remind me.

Michail, if you can show me how to set a default zoom so that we aren't just showing the whole protein, I'll try again. But I couldn't figure out how to do that. In addition, the mechanism for setting a center about which to rotate the view. So my main problems were:



On Tue, Oct 27, 2009 at 10:08 PM, Michail Vidiassov <master@iaas.msu.ru> wrote:
Dear Robert,

On Tue, 27 Oct 2009, Robert Hanson wrote:

> Before you get too excited, I should point out that I have given up on the IDTF/X3D format. The bugs in the PDF implementation are so
> significant that I don't think anyone could actually use this. The documentation for IDTFConverter has major errors, and although finally by
> looking at the source code for creating IDTF files I was able to work out the actual rules, even then I simply could not figure out how to get
> a zoom setting or anything like a "centered rotation" to work. As I recall they actually say in the documentation that there is "no default
> view" -- which, of course, there is -- it's just that it is different for different viewers.

You are right on this default view issue.
But the only viewer that matters is Adobe Acrobat/Reader and by setting
additional parameters in PDF (not U3D) or JavaSript you can specify what
view from U3D is to be picked up as the initial view of the model or
specify the view parameters without referencing any U3D views.
The problem is that the views in Adobe products are not exactly the same as in U3D
(have different set of parameters) due to the fact that the viewer, it
seems, was not developed from the Intel U3D sample sources, but an
existing product from Right Hemisphere was adopted to display U3D.
Thus views in Adobe viewers are better controlled with Adobe native
interfaces (PDF or JS) and not from within U3D.

> I think Warren Delano showed me how the surface business (was that it?) in X3D format is flawed. I'm not remembering the details.

That may be a real problem.
Are you sure that both

- Portable 3D structure Web visualization as embedded PDF from xemistry.com

and Chemistry, Physics, Research, Mathematics, Misc. part of pdf3d.com gallery

do not have examples of required surfaces?

BTW, if you find a reference to your thread with Warren - gimme a link, please.

> While all of this could just be due to my incomplete understanding of the format, there isn't much help out there to make it easy.

May be once Adobe deeper incorporates its new 3D PDF format, PRC, it will
document it in more details (there were even noises that it is going to be
a part of the next PDF standard) and there will be less trial-and-error
required to determine if, how and to what extent a certain feature is
implemented in Adobe viewer.
They certainly _can_ do that since they have bought the developers of PRC
(while developers of U3D in Intel got dissolved without trace and
 Right Hemisphere is Adobe competitor).
BTW., at http://asymptote.sourceforge.net/gallery/ you can see examples of
opensource experiments with PRC 3D PDF models.

       Sincerely, Michail

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Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
phone: 507-786-3107

If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900