https://www.bapugraphics.com/Learnphotoshop3dmaterialdroptool.php
Adobe Photoshop 3D Material Drop Tool
What is 3D Material Drop Tool?
Material editing and enhancing process is much easier currently with the 3D Material Drop Tool in the 3D panel. With the 3D Material Drop tool, Alt-click (mac: Option-click) a material to load it then click anywhere to drop it to one more part of your model, another 3D mesh, or one more 3D layer. Make use of the 3D Select Product tool to help target the right material as suggested by the material picker thumbnail in the 3D pane
