OSL, or Open Shading Language, developed by Sony Pictures Imageworks, is an open source shading language that allows you to create programmable shaders in advanced renderers like Arnold. The implementation of OSL in 3ds Max is done using both an OSL map and independent OSL textures.
One of the benefits of using OSL is that writing shaders for it is simpler than working with other methods like C++. Another advantage to OSL is that you can find hundreds of shaders available online through various repositories. Searching for “OSL shader download” will turn up several locations where you can download OSL shaders that can be used along with the OSL map.
The OSL implementation within 3ds Max is available when using both the Arnold renderer and the Nitrous based Quicksilver renderer in 3ds Max 2020. Note that you must be using 3ds Max 2016 or newer with Arnold 5.0 or newer. Also make sure you have the latest version of the MAXtoA plug-in for 3ds Max. The version number can be found on the Arnold Renderer tab in the Render Setup dialog.

Revit provides systems analysis tools that can help users choose the right HVAC system from the start of the design. Conceptual, analytical, or detailed designs all follow the same five-step workflow:
1. Add Analytical Systems: Start by adding zone equipment, air systems, and water/refrigerant loops in the Analytical Systems System Browser.
2. Add System-Zones: Sketch in lines or shapes to specify the rooms and spaces that will be served by that equipment. Then, in the Project Browser, assign the specific zone equipment that will be servicing each zone.
3. Assign Analytical Spaces: Add spaces using the Assign Spaces Automatically option. Create an Energy Model, and it will automatically create the Analytical Spaces and assign the zone equipment you specified.
4. Modify Analytical Spaces: Assign Space Types to all the spaces. Go through each space and assign what it will be used for, in order to create a realistic simulation of the entire HVAC systems behavior.
5. Run Systems Analysis: Click Run Systems Analysis to start analyzing your system!