Hello Himar,
using LOD sounds good, but don't work, if you put too much LOD in the
graph, you spend 2 hours when you start the software before you can see one
image. (or maybe I do something wrong, I'm also not experienced with OSG)
So , I experienced that it is not possible to create one LOD neither one
pagedLOD for each stars.
So I personnally use a VertexArray and a colorArray, and I use a shader to
manage the amount of light of each star depending the distance to the observer.
I think using VBO could be better than VertexArray, but I hadn't time yet
to test this.
So my problem now is too switch from point to 3D model when I'm closed
enough.
Regards.
----- Original Message -----
From: Himar Carmona
To: osg users
Sent: Tuesday, July 17, 2007 11:56 AM
Subject: Re: [osg-users] Dynamic update of the scene graph?
Hello,
did you have performance problems having 120.000 stars? I don't know how
do you achieve it (i'm new and i don't know to much things). Can you use LOD
nodes ? LOD nodes let you have each children draw only at certain distances
criteria. Something like:
- Point : Very far.
- Point Smooth : far.
- Point Sprite: near.
- Sphere: Very near.
This can let OSG make the changes for you.
2007/7/16, Benjamin Cabut <[EMAIL PROTECTED]>:
Hello,
I am working on a bench application that do this:
using DepthPartitionNode, I fly in a starfield.
Stars are Point, Point Smooth or Point Sprite dependind magnitude
(calculated depending distance)
I want to be able to draw 3D Sphere (and in the future more complex
object) when I am near enough to a star.
I tryed in the update of this StarsCatalog Object to add a Child to my
SceneRoot when I'm close to a star, but as soon as I go in the "travers"
application crash...
I don't understand why... I tough update was done for this, dynamic
modification, so I tough it was possible to dynamicaly add an object to the
scene.
Is it forbiden to change the scene graph in an update function? is
there limitations?
Is it the best way to do what I want or do you think of another
technics?
I tought to instance one or two spheres and change the MatrixTransform
when needed in the Updates, but I would like to know if you have better idea...
The scene has got currently 120000 Stars but should go to 4 000 000...
Regards.
CABUT Benjamin
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