Hi Regina,
On 21.10.2013 15:25, Regina Henschel wrote:
Hi Armin,
Armin Le Grand schrieb:
Hi Regina,
the dr3d:scene scene is - as in the model - the binding element between
3D content and 2D objects. It has two objectives:
- be a 2D element which defines where the 3D content is to be rendered
to, it's z-sorting and other 2D attributes, hence the 2D stuff like
svg:width and svg:height, these should be the 2d attributes of the 3D
scene in it's role as 2D object
- be the root of a 3D scene, with a hierarchy of 3D objects, lights and
camera definitions which will all be rendered to a 2D 'bitmap' content
(except the 3D shadow, that is another beast and creates 2D shadow
'behind' the rendered 3D bitmap, but as vector data)
That means, that svg:width and svg:height makes no sense for inner
dr3d:scene elements. ODF 1.2 does not distinguish this. So I will try
to get an additional remark into the spec.
Yes, exactly. Thanks for taking that over!
The camera for an inner 3D scene is ignored (only the outmost one makes
sense).
So in a nesting tree only one camera in a branch makes sense. But I do
not think, that it must be the outmost dr3d:scene. Imagine two
3D-scenes with camera, side by side grouped by a dr3d:scene without
camera.
I think that only the outmost camera definition makes sense; I am pretty
sure that only that one is currently used. I do not think that
constructing useful cases will ever be used; I would suggest to also
clearly state that only the definitions for the outmost scene are used;
when this ever changes, we may adapt that.
I would guess there was no easy way to make an extra-definitopn
for a 2nd 3D scene which allows both. Toe other sense of inner 3D
scenes is a simple group object mechanism (extensively used in 3D
charts).
Are the svg:x and svg:y attributes used in the inner 3D-scenes?
No, also pure 2D attrinutes, same as width and height.
HTH!
It confirms my opinion that the spec needs some clarifications in
regard to 3D-scenes.
Yes, definitely. In principle it's pretty easy:
- 2D attributes are only used for the outmost 3D scene (in it's role as
2D object)
- 3D attributes except transformation are used only for the outmost 3D scene
-> only transformation (homogen 3D matrix) is used in inner 3D scenes,
together with the grouping functionality
Sincerely,
Armin
Kind regards
Regina
On 21.10.2013 09:44, Regina Henschel wrote:
Hi all,
The element dr3d:scene has the attributes svg:width and svg:height in
the ODF specification. What do they mean?
When I set a special width in AOO, I can see, that the picture of the
3D-scene is stretched to the given width. That is the same behavior in
AOO as with width on an OLE object.
But following the spec a dr3d:scene can have other dr3d:scene elements
as child elements and I have no idea, what makes sense then.
Similar problem is with the attributes, which describe the camera.
What is the sense of an own camera for an inner 3D-scene?
Kind regards
Regina
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