[x3d-public] Display a reference coordinate system at the bottom left of my view

[Hans Moritz Guenther]

I'm trying to put a reference coordinate system (x, y, z) arrows onto my 
scene, such that they are always visible at e.g. the bottom left corner.

I found 
https://www.web3d.org/x3d/content/examples/Basic/DistributedInteractiveSimulation/CoordinateAxesX3dDISIndex.html 
which makes the x,y,z arrows and then it promises "See 
CoordinateAxesExample for use as an Inline coordinate-system reference 
frame.". That seems to be pretty close to what I'm looking for. 
Unfortunately, I can't locate the CoordinateAxis example; it's not in 
the list of examples for this chapter 
(https://www.web3d.org/x3d/content/examples/Basic/DistributedInteractiveSimulation/index.html).

Can you point me to that example or a different setup that might give me 
what I need?


The closest I've found is the ViewFrustrum example, as in "features get 
moved relative to the viewpoint" but in that case, the coordinates of 
the lines are re-calculated at every step, while my case seems simpler 
and I'm hoping that it can done with just ROUTE to set the origin of a 
TRANSFORM node, which contains the x,y,z arrows, relative to the 
viewpoint coordinates. However, I've not been able to figure that out 
yet - maybe I'm not connecting to the right properties (see code example 
below). I see the arrow, but it's not moving when I'm moving the camera, 
so it's going out of view when I look elsewhere. Instead, I would have 
expected it to always sit right on top of the camera. (In the end, I 
obviously want it to be at some constant distance from the camera, but 
if I can't figure out how to connect the location of the arrow to the 
location of the camera at all, then I don't have to worry about those 
details yet.)

Thanks for any advice,

Moritz

<Transformtranslation='-2 0 0'DEF="arrow">
<CollisionDEF='DoNotCollideWithVisualizationWidget'>
<Group>
<!-- Vertical Y arrow and label -->
<GroupDEF='ArrowGreen'>
<Shape>
<AppearanceDEF='Green'>
<MaterialdiffuseColor='0 1 0'></material>
</Appearance>
<CylinderDEF='ArrowCylinder'radius='.025'top='false'/>
</Shape>
<Transformtranslation='0 1 0'>
<Shape>
<ConeDEF='ArrowCone'bottomRadius='.05'height='.1'/>
<AppearanceUSE='Green'/>
</Shape>
</Transform>
</Group>
</Group>
</Collision>
</Transform>
<Viewpointdescription='Overview'orientation='0 1 0 
3.141592653589793'position='5 5 0'
viewAll='true'DEF='viewall'/>
<ROUTEfromNode='viewall'fromField='position'toNode='arrow'toField='translation'/>
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