Scalar fields\Gaussian filter
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This tool is accessible via the 'Edit > Scalar fields > Gaussian filter' 
menu.
Description
Smooths a scalar field by applying a spatial Gaussian filter.
The user must choose a 'kernel' size (in fact the radius of the sphere in which nearest neighbors will be extracted around each point to compute the mean value). The bigger the stronger the filter will be (and the slower the computation...).
Edit > Scalar Fields > Gaussian and Bilateral filters
Note: a new scalar field is generated (i.e. the original scalar field is not overwritten).