A subset of points in the input geometry to run the program on. Leave this blank to affect all points in the input.

What the group is made of.

Apply the VEX code to each component of this type (points, primitives/faces, or vertices. Or choose Detail to run the code only once. For each component, the code runs with attributes bound to variables starting with @ (for example @Cd) for reading and writing.

If you choose Numbers, Houdini runs the code for certain number of iterations instead of over components. In this mode the code only has read-only detail-level attributes bound to @ variables.

When Run Over is Numbers, the number of iterations to run the code. In each iteration, @numelem is bound to this total count, and @elemnum is bound to the iteration number, from 0 to @numelem - 1.

In this mode the code only has read-only detail-level attributes bound to @ variables.

When Run Over is Numbers, this is the number of iterations to run per separate thread. If this number is greater than or equal the Number count, all iterations will run serially in a single thread. If this is 1, each iteration will run in a separate thread. In between, the node will group the iterations into batches of this size, and run each batch in parallel on separate threads.

A snippet of VEX code that will manipulate the point attributes. You can use @‹variable_name› syntax to access geometry attributes.

Only create attributes if their names match this pattern. The default pattern allows any attribute to be created.

You can restrict the created attributes by replacing the * with a list of allowed names.

Bound attributes, such as vtxnum, cannot be created and will be ignored.

Requires that you declare @ bindings in snippets as prototypes before using them. This applies to both attributes (for example @Cd) and “convenience” bindings such as @ptnum and @Frame. For example:

// Declare bindings
int @ptnum;
float @Frame;
vector @Cd;

// Use bindings after declaration
int pointnum = @ptnum;
float red = @Cd[0] / @Frame;

Automatic binding with the @ syntax can be convenient, but as your scene becomes more complex there is the risk that a typo in an @ binding will silently just bind a non-existent attribute.

Automatically bind attributes to parameters by name. If for some reason you need CVEX parameters to have different names than the corresponding attributes, turn this off and use the Number of bindings parameter to set up mappings between Attribute name and VEX parameter.

Integer attributes will bind to integer parameters. Float attributes will bind to float, vector, point, matrix, or matrix4 depending on their tuple size. String attributes will bind to strings.

Automatically bind any groups to the integer parameter prefixed with group_. If for some reason you need CVEX parameters to have different names than the corresponding groups, turn this off and use the Group Bindings parameter to set up mappings between Group Name and VEX Parameter.

Manually specifies the bindings of each group.

VEX functions like ch() usually evaluate with respect to this node. Enter a node path here to override where the path search starts from. This is useful for embedding in a digital asset, where you want searches to start from the asset root.

When a VEX parameter is exported, the bound attribute will be created if it doesn’t exist. This pattern can be used to override the export option on the VEX shader to avoid writing to or creating certain attributes. The pattern matches the VEX parameter, not the bound attribute. The attribute will still be bound for reading.

If points are being run over, and the P attribute is written to, but the N attribute is not written to, any incoming normals will become out of date. When this option is set, vertex and point normals will be updated when this occurs.

Which attribute to use for matching. This attribute must be present on both inputs for matching to be done. Otherwise matching is done by element number (ie, point number when running over points). The attribute should either be an integer or string attribute. This controls how the opinput#_ virtual bindings connect. You can use v@opinput1_Cd, for example, to read the second input’s v@Cd attribute.

When compiled the Attribute VOP is able to work on the incoming geometry in place without making a copy of it. This can speed up processing as one less copy is made, but requires that the VEX code doesn’t bind for writing any attributes that are read from the first input.

The name of a group to use as the output selection. When the highlight flag is enabled for this node, this group will be the output selection used by later modeling tools (if it exists).

VEX can evaluate at 32-bit or 64-bit precision. 64-bit provides higher accuracy, especially for transforms.

The auto mode will switch between 32-bit and 64-bit depending on the preferred precision of the incoming geometry. When run in 64-bit precision, any created attributes will be 64-bit. When run in 32-bit any created attributes will be 32-bit. Use Attribute Cast to change the preferred precision.