In the Output File parameter you see a jumble of characters: You want to call the geometry/file sequence intermediate01_0001.bgeo, intermediate01_0002.bgeo, intermediate01_0003.bgeo, etc. Suppose you drop a ROP Output Driver node in your scene and call it intermediate01. We need to add padding or leading zeros to the file names. ![]() Let’s start with something really basic and something very common to do when rendering an image sequence or in our case, geometry files from a SOP network. Once you grasp the basics, you’ll realize just how powerful they can be. While many shy away from them, there really is no need to fear them. These expression do not have to be very complex to be useful either. But expressions are one of its many powerful features. ![]() I tend to think they give Houdini the reputation of being a tough application to get into. ![]() As you know, the use of expressions is everywhere in Houdini.
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