Hi! A few things: - Unless your HDA explicitly uses a custom environment path, no additional mapped environment paths should be necessary for loading a basic HDA. You can send the HDA if you want me to check if this is the case. Also, sending the error log would be nice as well. - Make sure that Assets/plugin/unity_houdini.env file exists. It is relative to your project folder. - All environment paths must be prefixed by "HEU_ENVPATH_", e.g. HEU_ENVPATH_COMMON_HDAS=C:\Dev\Houdini\CommonAssets . See: https://www.sidefx.com/docs/unity/_environment.html [www.sidefx.com]