You can also use expressions with Hscript, to create more complex scripts. Expressions are often used directly in an operator's parameters to create channel references, animate a channel like using a sin() expression, and more. You can add new operators, wire them together, change their parameters and many other things with Hscript. Hscript gives you commands to directly control Houdini and its user interface. In fact, Hscript and Expressions are very closely related and can work together. There are at least three "scripting" languages in Houdini: Hscript, Expressions, and VEX. In a sea shell, VOPs are an extremely powerful context where your options and are both far and wide. VOPs can be used to make parts of a lighting system, designed so a new user just wires up the pieces and doesn't worry about the details. The VEX Mountain SOP was created using VEX, so you can create your own version in VOPs if you wanted to. For example, the Sprinkler POP was created using VEX, which means it can be created using VOPs.
VOPs let you create new COPs, so you can use them to create cool compositing operations. VOPs let you create new POPs, so you can use them to create effects. VOPs let you create new CHOPs, so you can use them as an animation tool. VOPs let you create new SOPs, so you can use them as a modeling tool. You can use VOPs to create very simple, specific shaders or you can create very complex, general shaders and anywhere in between. However, if you don't know VEX, that's fine too! VOPs were designed to be useful to all levels of users. If you already know VEX, you'll find VOPs a quicker way to create VEX code. You can graphically wire together nodes, which essentially creates blocks of VEX code. Each VOP node contains a snippet of VEX code.
VEX operators (or VOPs) are the graphical building interface to the VEX language. In the next few months VFXWorld readers will learn the basics of the dominant tool that has been used in the creation of some of the most awe-inspiring animation and cinematic effects ever made. This is the next in a series of excerpts from the Thomson Course Technology book The Magic of Houdini by Will Cunningham.
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