John
On 9/26/06, Paul Melis <[EMAIL PROTECTED]> wrote:
John Aughey wrote:
> There is a problem with the osg Optimizer. I generally don't run the
> Optimizer on scenes because I want to preserve the node construction,
> but it is used by default in osgviewer and osgconv. I discovered this
> problem when trying to view a model in osgviewer.
>
> A model that exhibits the problem can be found at
> http://thinksplat.com/cubetest-cleanup.osg You can ignore the
> textures. If you view this with osgviewer, you'll see a cube, an
> outline of a cube, and another cube 7 times higher than the outline.
> The correct viewing of this file should be to have the cube that is
> way up in the air be within the bounds of the wireframe cube.
>
> If you modify osgviewer and comment out the optimize step, it looks
> like it is supposed to look. I do not have a fix for the Optimizer,
> but I can give some suggestions. The group that is offset has 7
> children, and those children are offset by a factor of 7. It looks
> like the problem could be in Optimizer::*::removeTransforms methods.
Well, the different positioning of the cube is definitely reproducable.
Turning of the optimizer indeed changes the scene shown.
As you're probably aware you can turn off the optimizer without changing
any code by setting the environment variable OSG_OPTIMIZER to OFF.
I think the optimizer should be disabled by default. There's too many
surprising and unwanted side-effects because a scenegraph is altered
when it is loaded. Only when a user specifically requests the
optimization should it be performed.
But there is a difference between working with a scene graph as a
data-structure on which you want to perform operations and merely
viewing the scene. In the former case you don't want anything to touch
the graph without your permission ( i.e.what the optimizer does). When
you're just viewing a graph it might not be a problem that the scene
gets optimized for viewing at load time.
What happens in your case is simply incorrect.
My 2 eurocent...
Paul
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