[x3d-public] Labels in 3D

[Leonard Daly]

This is mostly for Nicholas and Vince who expressed an interest in 
labeling things in 3D where the labels had the capability of HTML to 
include various fonts, styles, text, graphics, links, etc.

I would like to know if these types of labels meet your needs or 
something else is needed.

This is using my testbed (XSeen). The example is at 
http://realism.com/XSEEN/test/labels.html.

All labels are done in HTML. The lines connecting the label to the 3D 
object is done in 3D space. The labels retain their screen position as 
the camera is moved. There are three types of labels illustrated in the 
example -- fixed, relative, and draggable.

The fixed label is attached to the "monster" The label line tracks the 
local origin of the monster model.

The relative label maintains the initial relative screen position to the 
projection of the (local) origin of the object. The label moves as the 
object moves. This is particularly obvious when looking from the side.

The last label (draggable) is attached to the torus. The user may move 
the label to any position in the canvas (2D projection of the 3D space). 
The leader line maintains the connection from the label to the object.

There is preliminary documentation on the tag at 
http://tools.realism.com/specification/xseen/language-definition/user-interactions/label

Caveats:
1) The leader lines do not track well when the camera position is 
changing nor when a draggable label is being moved.
2) Things don't work as you would expect (or hope) for the stereo camera.


-- 
*Leonard Daly*
3D Systems & Cloud Consultant
LA ACM SIGGRAPH Chair
President, Daly Realism - /Creating the Future/
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