You must specify a valid license in your application code in order to use HOOPS 3DF. The license is compiled into your application by calling the HOOPS/3DGS routine Define_System_Options and setting the Define_System_Options_license "license". The actual license-key portion of the string must be contained inside backticks, for example: Define_System_Options("license = `your_license_string`");
The license key is a character sequence obtained from the Visualize product-download page in the TS3D Developer Zone, or provided by Tech Soft 3D. A visualize_license.h file will be provided, which contains the actual license key. If the license string also includes license information for the Exchange and Publish products, that information will be passed to those products when using the HIO Exchange and/or HIO Publish components.
The provided top-level HOOPS 3DF C++ samples project/makefile will reference visualize_license.h for convenience. To leverage this setup, you should copy your license file to the <install_dir>/dev_tools/hoops_3dgs/source/ directory of your 3DF installation. C# and Java applications will still need to set the license string directly via a call to Define_System_Options.