Roughness

Update the roughness property of the PBR material at default index 0.

If this property is used as the Pipeline.updateSceneGraphProperty's targetProperty parameter, the data tensor parameter must be a single floating-point scalar value, i.e., a tensor declared using Tensor.FloatArrayInitInfo or Tensor.DoubleArrayInitInfo with size 1 (equivalent to a Tensor.ScalarInitInfo with size 1 and datatype = Tensor.DataType.FLOAT64 or Tensor.DataType.FLOAT32, but not recommended).