PBR (Physically-Based Rendering) is a modern technology which delivers more realistic real-time and ray-trace output.
Support for PBR is reflected in:
Improved output in the 3D window and when rendering.
An increase in the number of material maps, the details of which are shown in the Context view for each material type.
Addition of Browzwear PBR FBX format as an option when exporting 3D objects
The following image shows some of the channels and the effect of the different values for intensity.
Although there are a larger number of material maps, it is not necessary to use them all.
Specular and roughness maps use the gray level intensity of their respective map images.
Diffuse, subsurface, and normal maps use the colors of their respective map images.
In channels using an image and an intensity, the intensity value determines how much of the image is used in the output.
Adding a texture image automatically sets a channel’s intensity to 1.
For more information, refer to:
The Help content about editing material properties. For example: Editing Fabric Properties
Introduction to PBR (PDF).