Сan be assigned to show diffuse texture to the model if it is to apply PBR? I founded in the documentation, only examples of pre-set: metal, plastic, glass and wood. For example:
var scene = new BABYLON.Scene(engine);
var camera = new BABYLON.ArcRotateCamera("Camera", -Math.PI / 4, Math.PI / 2.5, 200,
var hdrTexture = new BABYLON.HDRCubeTexture("textures/room.hdr", scene, 512);
var hdrSkybox = BABYLON.Mesh.CreateBox("hdrSkyBox", 1000.0, scene);
var hdrSkyboxMaterial = new BABYLON.PBRMate