When using three.js, I find myself a little confused about the concepts of metalness and roughness. Can someone explain the differences between metalness and roughness when applied to materials like mirrors and metals/steel? And furthermore, how can these effects be achieved?
For instance, how would one go about creating a mirror material similar to this example:
https://i.sstatic.net/B1De2.jpg
and a metal material such as the one shown in this example:
If you've dabbled in PhotoShop or GIMP, the concept of using a Gaussian blur tool may ring a bell. In the world of 3D modeling, roughness functions in a similar way. When the roughness is set to 1, the environment map becomes blurred; when it's set to 0, there's no blur present at all.
On the flip side, metalness dictates how much of the surroundings an object should reflect. A setting of 1 will deliver a reflection that perfectly mimics the environment at full intensity. It's like adjusting the opacity of the environment applied to the object. Conversely, a metalness setting of 0 can lead to issues—especially if the object lacks textures (such as a mirror without any texture mapping). Without proper textures, the object will appear black, which makes sense given the absence of visual detail.
For some excellent demonstrations using three.js, check out these links:
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