TCSTInterface - CST Studio Suite to MATLAB Interface

MATLAB interface to commercial EM simulation software CST Studio Suite (CST Microwave Studio)

======= Introduction =======

This `TCSTInterface` class allows for communication with CST Microwave Studio (CST Studio Suite) from within MATLAB using Windows' COM technology.

The main goal of this submission is to control an **existing** CST project, get and post-process the simulation results, export geometry and get various information from the project. If there is a need to **build** the geometry programmatically, there is another good submission in Matlab File Exchange (https://se.mathworks.com/matlabcentral/fileexchange/67731-hgiddenss-cst_app) which suits better for that.

======== Features ==========

This CST-MATLAB interface features the following:

### Model control:
- Open/close CST project, connect to the active one;
- Store/change/read/enumerate parameters of the model with or without the model rebuild, getting parameters' expressions.
- Copy all model parameters and their values to MATLAB workspace.
- Enumerate/add/delete field monitors.
- Find Run ID for the given parameter combination.

### Solving:
- Run selected solver;
- Preparing the CST project for evaluating the cost function in MATLAB while optimizing. It can also be used for running a custom MATLAB function as the CST simulation post-processing step ("Template Based Post-Processing").

### Retrieving results:
- Enumerate tree items in the Navigation Tree.
- Read 1D results from any tree item with several available filters.
- 1D results can be queried for a specific X-coordinate (often frequency), optionally with interpolation.
- Read S- or Z-parameters in a convenient matrix form for multi-port structures.
- Get model parameters corresponding to each Run ID in the Result Navigator.
- All queries for results can have a Run ID filter.
- Read radiation field for both single-frequency and broadband field monitors.
- Reading results for parametric sweeps done in CST. As an option, each such result can be organized in a matrix, each dimension of which corresponds to one of the swept parameters.

### Exporting:
- Export S-parameters to TOUCHSTONE file by means of CST;
- Export current model view to an image. User can rotate the model view before exporting.
- Export the model geometry to an STL file (triangulated objects) with surface approximation control.

### View control (useful for image exporting):
- Rotate 3D view to predefined position or custom view direction (like in MATLAB "view" function).
- Toggle wire-frame view.
- Toggle gradient background.

### Getting various information:
- About materials used in the project: name, color, transparency.
- About geometrical objects (solids): name, component, material, color and transparency (exactly how it looks in CST), volume, mass.
- CST license info.
- Project units for different quantities and coefficient to convert them to SI units.

In addition, a customized STL-file reader is included in order to plot geometry like they are seen in CST MWS.

One of the class methods (`ReadParametricResults`) use two custom classes (`TResultsStorage` and `TMyTable`). I apologize for not providing source code for them, but they are not yet in the state to go public :)

If other functionality is desired, please post a feature request here: https://github.com/korvin011/CSTMWS-Matlab-Interface/issues

==== DEMOS / DOCUMENTATION ====

All functionalities are well documented in the included Live Script demos. MATLAB R2018a or higher is desired in order to not loose code samples in the demos.

======== Bugs found? ==========

If you encounter any errors or notice some misfunction while using the interface, please open an issue directly in GitHub (https://github.com/korvin011/CSTMWS-Matlab-Interface/issues).

======= Acknowledgment ========

I would like to thank Jan Simon for his great function `GetFullPath` (https://se.mathworks.com/matlabcentral/fileexchange/28249-getfullpath), it is very helpful for this interface.