In earlier versions, you’d have to wait until that first image was done (or you cancelled it) before you began working again. So, you can launch a preview with parameters, the computer can chew on that image while you move on to make a new iteration. Since progressive rendering is what this is all about - the fast iterative nature of lighting - Katana 4.0 can render multiple preview renders at the same time. The major point is that everything you need to make your lighting adjustments is right there at your fingertips. There is a default set, but you can show more or fewer parameters if you want. You also have a floating interface within the Hydra Viewer of the most critical parameters of the light you have selected - or all the lights. Or, again with a gesture, scale the light up or down - which will modify the intensity and the softness of shadows. Through some modifier keys and pen gestures, you can move the light closer or further away, because as all cinematographers know, the proximity of the light is one factor for how bright it is, due to exponential falloff. Then, the light is created pointed at that spot. In the Katana 4.0 workflow, you click on the surface that you want illuminated - and that could be where you want the light, or a specular kick, or a reflection, or even how you want the shadow to land.
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