Hi Hui,
On Tuesday, 26 May 2020 10:36:18 UTC+1, Hui Li wrote:
>
>
> The codes looks like this:
> ```
> root = GroupOfSwitch();
> viewer->setSceneData(root);
> while (!viewer->done()) {
> root->removeChild(0); // Remove the point cloud
> pc = sensor.Capture(); // Get the point cloud
> geo = CreateGeometryNode(pc);
> root->addChild(geo); // Add the pointcloud
> viewer->frame();
> }
>
>
In "principle" this shouldn't cause unbounded memory growth but as you
don't provide any details about the CreateGeometryNode() there is no way
for use know what is going on there. It could be that your leak it right
there in that function call, or else where somewhere in your application.
While I can't comment about the details of your implementation the approach
of removing, creating and adding new nodes and associated data each frame
is really, really inefficient.
As much as possible you should try to reuse data. For a point cloud
application where the data is dynamic I would personally allocate a fixed
number of Geometry nodes with fixed Vec3Array's within them and single
DrawArray primitive set. I'd allocate the Vec3Array to it's full size
right up front and next change it's size. The DrawArrays has a count value
that you can set to specify how many vertices in the array need to be
rendered and needn't be the whole length of the Vec3Aray.
With really large datasets I would chunk the data so rather one big
osg::Geometry, I'd have say 10,000 vertices in each osg::Geometry. I would
also use VertexBufferObjects and avoid using DisplayLists.
Do this all correctly and you should get a good performance and no memory
growth.
Robert.
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