Painting in a 3D smoke effect

In this exercise, we're going to paint in the smoke.…And I think you'll be amazed just how easy it's going to be,…thanks to the fact that we've saved out those masks.…I'm going to go ahead and switch over to my composition in progress, which is…called Brighter letters.psd.…Make sure that you have your Project masks.psd file open as well; the one that…contains the four masks inside the Channels panel.…All right; I'll switch back to the image in progress, switch back to the Layers…panel as well, click on the smoke layer to make it active, and then go ahead and…turn that smoke layer on.…Now, if we turn the letters layer off for a moment, you'll see that the smoke…is in white against the dark background, and it absolutely covers up everything behind it.…

To make it interact, we need to drop out those dark areas by going up to the…blend mode pop-up menu, and changing the blend mode from Normal, to Screen.…Now we have the interaction we're looking for.…Now, the letters should be coming through the smoke, so none of the letter forms…