support draw model with pyvista

Author: zhangzhanqun

examples/Explicit/ansys-pydyna-pre-server.zip

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+Start pydyna pre server locally
+===============================
+
+There are two ways to start the pydyna pre server
+
+1.Start server manually
+-----------------------
+
+* Run this command in the current folder:
+
+  .. code:: console
+
+   python kwserver.py
+
+2.Start server automatically
+----------------------------
+
+Start server on Windows
+~~~~~~~~~~~~~~~~~~~~~~~
+   
+#. Set environment variable:
+
+   .. code:: bash
+  
+      Variable name:  ANSYS_PYDYNA_PRE_SERVER_PATH
+      variable value: <The file path of this package>
+
+      example of variable value: C:\pydyna\ansys-pydyna-pre-server
+
+Start server on Linux
+~~~~~~~~~~~~~~~~~~~~~
+
+#. Set environment variable:
+
+   .. code:: bash
+  
+      ANSYS_PYDYNA_PRE_SERVER_PATH=<The file path of this package>
+
+      example of variable value: /home/lstc/ansys-pydyna-pre-server
+
+Run an example on the client side
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ 
+   .. code:: bash
+
+       hostname = "localhost"
+       if len(sys.argv) > 1:
+           hostname = sys.argv[1]
+           solution = DynaSolution(hostname)
+           ......
+
+#. The function of DynaSolution() will start the pre server automatically.