Curtis Olson wrote:
> On Sat, Mar 21, 2009 at 12:06 PM, Tim Moore wrote:
>
> Melchior FRANZ wrote:
>
> > Doesn't sound like a valid reason to me:
> >
> > SGVec3 vec = n->getVec3Value("/some/vector");
> >
> The syntax is actually:
> Vec3d vec = n->getValue<Vec3d>()
> > vs.
> >
> > SGVec3 vec = getVec3(n->getNode("/some/vector", true));
> That is not correct, because there is no explicit ordering of
> property node children.
> You need different functions, or some helper argument, for every
> property type that
> is vector-like -- colors, positions, normals, rotations, etc.
>
>
> I may be misunderstanding your point, but there are multiple children of
> a property node, all with the same name, then there is an explicit
> ordering ... you can provide the ordering yourself, i.e <value n="2"> in
> the xml file, or "value[2]" when referencing the property name, or
> getChild("value", 2) when using the tree walking API. And if you don't
> specify any ordering, the values are created in sequential order. If you
> have unique property names, then I don't see a need for ordering since
> you just reference the name of the thing you need.
That's the point: colors and positions use red-green-blue and x-y-z, so there
isn't an explicit ordering; therefore you can't write a general function that
takes such a compound property node and returns a Vec3d or Vec4d.
>
> But in any case, I'm not worried so much about concise syntax in
> C++; I'm talking
> about the syntax of the XML files that will use the new properties.
>
>
> Again, I think that the syntax in the xml file is the least concern. Do
> your expected usage cases involve 100's or 1000's of these entities
> where a few bytes here or there could make a noticeable difference, or
> just a few here or there where we are talking about fractions of a
> percentage of the overall fiile size?
A complex effects file might have 100 parameters, though that's probably
a stretch. On the other hand, there's not a lot of structure other than
parameters, so we are talking about a good precentage of the file.
Tim
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