Hi Aaron,
The sorting on your globe can perfectly solved with viewportLayers. The globe can be rendered at layer 1 and the planes at layer 2, so they will appear always on top.
An example implementation of this looks as follows:
var globe:Sphere = new Sphere();
scene.addChild(sphere);
var plane:Plane = new Plane();
scene.addChild(plane);
var globeLayer:ViewportLayer = viewport.getChildLayer(globe);
var planeLayer:ViewportLayer = viewport.getChildLayer(plane);
globeLayer.layerIndex = 1;
planeLayer.layerIndex = 2;
viewport.containerSprite.sortMode = ViewportLayerSortMode.INDEX_SORT;
This is just one of the ways you can use viewport layers. I hope this helps.
Paul
On Jul 3, 2009, at 12:18 AM, Aaron Meyers wrote:
Hello,
I am starting work on a project where objects will be plotted on the earth. I've put together a quick test and found that when i position objects around a sphere, I have some clipping problems with the polygons of these objects. I put together an example to show what I'm talking about:
You can click to change from plotting planes to cubes. I've actually offset the planes a bit away from the radius of the sphere, but the clipping problem is still pretty severe. I once encountered something similar in an OpenGL project and it turned out to be z-fighting and after adjusting the near clip and far clip distance on my projection matrix, it was fine. I suspect something like this might be the cause of my problem, but I don't really understand the inner workings of the Papervision3D transformation pipeline.
Does anyone know how to get around this? Any tips? Thanks for any help.
-Aaron
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