[Papervision3D] z-ordering issue

[Nikos Chagialas]

z-ordering problems again..

this time I either load a collada file with different objects close to each
other or I create these objects using pv primitives. Here is an example:
http://www.devgallery.com/test/pv/

Use ctrl+left mouse to rotate the object around, mousewheel to zoom.

In the scene there is a cube for the base and 9 cubes/columns perpendicular
to the base, that are located very close to the it. When you rotate the
object around you see the depth problems appearing and objects overlapping
each other.

Any ideas how can I fix that? Can the viewport.getChildLayer(obj).layerIndex
method be used here and how?

Thanks
nikos

2009/5/21 Nikos Chagialas <nikosgroups at gmail.com>

> Thanks Paul,
> I excluded the back-face of the cube and that solved it.
>
> I know..I started like that, having a cube and later on I decided that I am
> gonna use some interactive content so the first thing that came into my mind
> was to use a plane. I realised it afterwards, but had already done most of
> the interactive bit..and was a bit lazy too to change it!
>
> thanks for your help
> nikos
>
> 2009/5/21 Paul Tondeur <paul at paultondeur.nl>
>
> Hi Nikos,
>> First of all, why don't you add the image and text to one of the sides of
>> the cube, instead of having the cube and very close in front a plane with
>> the text and an image. By having the two faces so close to each other, you
>> are asking for z-sorting issues.
>>
>> Beside adding the image as a texture for the back-face of the cube, you
>> can also mark the back-face of your cube as an excluded face. This can be
>> achieved by using the last parameter at instantiation of the cube: varcube:cube =
>> new Cube(mat,500,500,500,1,1,1,0,Cube.BACK);
>>
>> ViewportLayers can also be used to solve your issue. Just add the planes
>> to 1 viewportlayer and leave the cubes as they are. Performance wise this
>> isn't the best solution, as Papervision3D will first draw the cubes and then
>> the planes in front. It would be a waste of capacity to first draw the back
>> face of a cube and then draw the plane above it and never see the cubes
>> back-face.
>>
>> Paul
>>
>> On May 21, 2009, at 2:29 PM, Nikos Chagialas wrote:
>>
>> Hi,
>> I know this probably has been talked a lot in the list, but I can't seem
>> to find any solution.
>>
>> I 've got a scene with some floating Panels. Each panel contains a cube as
>> the basis and a plane for the content (image, text), which is placed -8
>> pixels in the z axis.
>>
>> http://www.devgallery.com/test/pv/1/
>>
>> I have used viewport.getChildLayer(obj, true).layerIndex = ++topDepth; for
>> sorting out the depths on rollover, etc.
>>
>> However, even though the content plane is set to have a greater depth than
>> the cube and also placed in front, a diagonal black line is displayed in the
>> content-image when animating.
>>
>> I have tried useOwnContainer=true but didn't help. If I use it for all
>> objects it produces the same bug, where if I use it only in the content
>> plane it fixes the line but breaks the z-ordering.
>>
>> Any ideas?
>>
>> thanks for your time
>> nikos
>>
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