[fluxus] equality commit (Re: interactivity issues)

[Claude Heiland-Allen]

Dave Griffiths wrote:
>>Still got the weird "camera must be right on top of an object for it to
>>register a (mouse-over)" issue, though.
> 
> 
> Have you got the sky sphere around everything?

Nope, only (ground-plane)s to make a container, and a cube with 
(selectable 0) to show the edges of the container, pretty much exactly 
the same as 20-interactive.scm.  And I've restarted fluxus many times in 
case there was old stuff hanging over...

> mouse-over is a little dumb
> in that it only returns one primitive - the closest one to the camera in z
> depth (really it should return a list of all the primitives in z order or
> something) this means that it can get confused when objects overlap - and
> my brain is too consumed by eq? atm to know how it will deal with things
> scaled negative :)

Attached is the script that exhibits the weird behaviour here, would be 
grateful if you could take a look and see if there's anything 
immediately amiss.  Here the top-level every-frame action doesn't even 
print anything unless then camera is right on top of the object, and 
even then it only seems to work if you click very near the edge of where 
the object gets clipped by the camera.  I'm puzzled...


Claude
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