Blurb::
Specify how the random field will be built:  
from a data file, from simulation 
runs, or from a covariance matrix.  
THIS IS AN EXPERIMENTAL CAPABILITY. 

Description::
As part of the capability to generate a random field representation, the user 
needs to specify the data used to generate the random field representation. 
This data may reside in a data file, it may be generated by running a set of simulations and generating field responses, or it 
may be generated by a covariance matrix defined over a mesh. 
THIS IS AN EXPERIMENTAL CAPABILITY UNDER ACTIVE DEVELOPMENT. 

<b> Default Behavior </b>
Currently, the \c build_source that is fully working is the 
\c dace_method_pointer.  The others are not fully operational. 
 

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