[X3D-Public] 18.4.3 MultiTexture - Possible Inconsistency

[Don Brutzman]

spec bug resolution

Specification: X3D Architecture (ISO/IEC 19775-1)
Section: 18.4.3 MultiTexture
URL: http://www.web3d.org/x3d/specifications/ISO-IEC-19775-1.2-X3D-AbstractSpecification/Part01/components/texturing.html#MultiTexture

> Comment:
> MultiTexture spec sayeth
>
>   MFString [in,out] source []
>
> and
>
>   The source field determines the colour source for the second argument.
>
> This seems inconsistent. If the source value only applies to the second argument, then source ought to be SFString.
>
> p.s. example scenes using MultiTexture would be helpful.


http://www.web3d.org/membership/login/mantis/view.php?id=476#bugnotes

Discussed on X3D working group call today. The source field is correctly specified as MFString. So the preceding proposal is incorrect.

New change suggestions:

Paragraph 4, last sentence. Change
"The mode field may contain an additional blending mode for the alpha channel."
to
"The enumeration value chosen for the mode field may also specify the blending mode for the alpha channel.

Table 18.3:
Add "(default)" after first table entry MODULATE for consistency.

Add sentence at end of source field paragraph:
"Typically there are the same number of source values as textures. Otherwise the default source value is used.

Add sentence at end of function field paragraph:
"Typically there are the same number of function values as textures. Otherwise the default function value is used.


all the best, Don
-- 
Don Brutzman  Naval Postgraduate School, Code USW/Br      brutzman at nps.edu
Watkins 270   MOVES Institute, Monterey CA 93943-5000 USA  +1.831.656.2149
X3D, virtual worlds, underwater robots     http://faculty.nps.edu/brutzman