[x3d-public] fogCoordinate description problematic

simon place psiplace at netscape.net
Fri Jul 5 11:41:31 PDT 2019

looking at https://www.web3d.org/x3d/tooltips/X3dTooltips.html#FogCoordinate.depth

i notice it says

> FogCoordinate defines a set of explicit fog depths on a per-vertex basis, overriding Fog visibilityRange.

seems to me they actually 'bypass' and the above wording may be a
symptom/contribute to a confusing description....

the spec. http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/enveffects.html#FogCoordinate
seems, to me, to be interpretable as meaning either:

the depth's replace the visibilityRange value ('overriding' it in the
calc.,  as the above implies),

or, what i think,

that they replace the result of the calculation that is using
visibilityRange ('bypassing' it)  and are so in-fact simply blending
factors independent of the avatar distance.

in either case a much simple/clearer wording seems very possible,
particularly the liberal use of the word 'depth' to refer to a
non-distance thing seems an issue.

(Note also; that page refers to the depth's as MFVec3f but includes a
link showing them to in-fact be MFFloat)

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