On the same layer we shall use the Dodge Tool (O) to draw several highlights.

Set the next shown parameters on the top layer containing the letters. Blending Options>Gradient Overlay

Gradient’s parameters:

Blending Options>Stroke

Choose the Line Tool (U) to create the vertical lines of white color, showing the edges of the voluminous letters.

Select the Pen Tool (P) now for drawing a band of black color, applying after that the Convert Point Tool for making the appropriate corrections on its shape.

The layer’s parameters: Blending Options>Gradient Overlay

Gradient’s parameters:

Using the last applied tools, it’s possible to draw one more band, like the one from next image: