Here's how to change existing materials to custom materials... so easy.
It's important to note that all materials in KeyShot are scientifically accurate materials with properties added to be the most realistic possible.
Also, if you're looking for more settings on your materials, you can select the 'Advanced' Material Type in the pulldown, located next to the material thumbnail in the Materials options.
Say you want to change a plastic material to glass or maybe you just imported a model and it has no materials.
After the model is open, go to the materials you want. In this case we want to change it to glass. You may not see the color you want, but that's ok. Drag and drop one of the glass materials onto the part you want to be glass. Here we dropped the red glass onto the outer part. It updates instantly.
Next, double-click on the part you just dropped the material on. The material properties will come up. To change the look, simple select the color option and adjust the color to what you need.
Additionally, you can add that material to the library. In the Material option, change the name to what you like then hit the save button (disc icon to the right) or right-click on the part with the material and select 'Add material to library." Navigate to the relevant material group and select OK. Done!