How to manage memory?

[tpwrules]

I have a simple script which loads a bunch of files using pycc.FileIOFilter.LoadFromFile, but I cannot figure out how to destroy the ccHObjects that it returns. Thus, the loaded files are simply leaked and CloudCompare eventually crashes because it runs out of memory.

I also cannot figure out how to remove objects that have been added to the DB, or how (or if) I should destroy the clouds returned from methods like resampleCloudSpatially, partialClone, etc.

I think there needs to be a section on memory management in the documentation, and perhaps some additional methods added if necessary. I don't think it's possible to correctly manage memory right now.

[tmontaigu]

The memory management is the same as regular Python so you should not have to care about about deleting/destroying objects.

The fact that pycc.FileIOFilter.LoadFromFile leaked memory was due to leftovers from a time where memory management was unclear with the DB.

And the removeFromDB method was added to the ccGUIPythonInstance API.

The master branch contains the fixes.

[tpwrules]

Memory management still does not quite work with ccHObject. Consider the following code:

file = pycc.FileIOFilter.LoadFromFile(path, params)
obj = file.getChild(0)
del file

subsampled = cccorelib.CloudSamplingTools.resampleCloudSpatially(obj, 0.001, mod_params)

CloudCompare crashes at the last line because del file destroyed the child obj while Python still had a reference to it.

[tmontaigu]

the plugin is still very experimental so not all things are not going to work flawlessly.

This case may be fixable

In the meantime, you can just remove that del

[tmontaigu]

Fixing this required a bit more work that I initially thought, but it should work now.

I expect some other similar case to exist