Hit the little plug icon to the right of the text editor, Houdini scans the vex code, realises you’ve referred to a channel that doesn’t exist yet, and. bookmark_tabs: A collection of code snippets and examples showing syntax and capabilities of VEX language inside SideFX Houdini – jtomori/vex_tutorial. Introduction. For those who tried (or afraid to start) to learn VEX but fail and stop because it was too hard. Here you will learn VEX and some.

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Well, if we have many prims in a shape, then there’s a few more book-keeping things to do. I realised that’s because we’d already multiplied d by the scaling channel to control the number of waves. Also note that pcfilter does a more joudini job than the neighbour based method earlier, it knows to give far away points less importance than closer points.

This is the main function of the program that is called by mantra. See the specific context pages for the global variables available in each context.

Bit of digging, found that the group names are stored in a detail intrinsic attribute. Because my vex stuff within vops is never very complicated, a snippet is fine for my needs, but here’s my earlier ‘inline code’ notes just in case:.

That means we’ll need to measure the distance of each point to the origin:. Imports channel data from a point cloud outside a pciterate or a pcunshaded loop. Expression functions Expression functions let you compute the value of parameters.


Simplex noise is very close to Perlin noise, except with the samples on a simplex mesh rather than a grid.

Create a line from the found point to myself. This being real life, some points are slight rotated, which ruins my end result. VEX compiler pragmas Shader Calls. One way is to iterate through each point, look at its neighbours, add up the result, and divide by the number of neighbours.

At this point I realised I knew how to go from N and up to a matrix or quaternion, but not the other way. A better way is with the optransform vex function.

Returns the relative position of the point given with respect to the bounding box of the geometry. Whatever you connect as an input to the snippet also becomes an output. If you look at that in wireframe, you can see that it looks like a cylindrical uv projection, because that’s exactly what it is. This may be an issue in performance-sensitive sections of your code.


I use the same variable to colour the circles and scale them because, well, why not? VEX is a high-performance expression language used in many places in Houdini, such as writing shaders. Sidefx have a cheat sheet similar to this one, but it assumes a lot of prior knowledge. Pyro How to simulate smoke, fire, and explosions. Returns the point into which the vertex following the destination vertex of a half-edge in its primitive is wired.

Arguments of the same type can be declared in a comma separated list without re-declaring the type. To set this you use the setprimitiveintrinsic function, the setup and scaling of the matrix is the same. Returns 1 if the edge specified by the point pair is in the group specified by the string. Viewers Viewer pane types. There’s a specific order these are run in, but because I never remember, I try to not write vex that expects deletes to be done before reads, or vice versa. In theory you could also use a cracktransform to get the euler rotation values, and plug those onto the camera using hscript, but I find I’m now actively avoiding hscript more and more.


The tells houdini that you want this to be an attribute, the default type is float. Vex is as a general rule always going to be faster than using hscript, and will scale much better.

VEX language reference

Used to pushstate to “undo” move. I end up using loads of these all through my setups. Doesn’t work though if you have overlapping groups though, in which case its fancy shmantz intrinsic vex magic for you.

We probably want to set the position rather than add to the existing position:. Amazingly, the function is called rotate.

HoudiniVex – cgwiki

From here it’s plain sailing. Inside a struct function, you can use this to refer houvini the struct instance. This page has been accessedtimes.