1 x 1 picking viewport

[Kurtil]

Picking with a 1 x 1 viewport. I used the clip position remapping method used by @tmarti for the snap picking.

I've fixed the precision issue with commit e9549ca so I edited this description - @xeolabs

[Kurtil]

Ray picking precision issue #1105.

[Kurtil]

Merging this PR may close #1076 and #513.

[ghost]

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[xeolabs]

@Kurtil is BIMData depending on ray-picking functionality (with origin->ray) ? I don't even know of any users who are actually depending on ray-picking, so if that can't be fixed, I'd be in favour of removing ray-picking altogether, if that stands in the way of faster surface picking with canvas coordinates (enabled by this PR). Fast model interaction is always our top priority (and canvas surface picking is a big part of that, since it's used by camera interaction).

[Amoki]

We use ray pick to implement a laser measurement giving the distance between two objects.

[xeolabs]

@Kurtil I've fixed the precision issue while doing a merge conflict fix: e9549ca

[tmarti]

@xeolabs at Tribia we're also depending on ray picking for laser mesurements, plus some custom functionalities for obtaining the ifc-storey and ifc-space where the camera is! 🙂