VEX Global Variables and Channels 2

What is a channel in VEX?

• A global variable
• A reference to a parameter
• A function
• A rendering attribute

Answer explanation

A channel in VEX refers to a parameter, often accessed using functions like ch().

How do you create an integer custom parameter in VEX?

• Using ch()
• Using chi()
• Using chf()
• Using chp()

Answer explanation

The chi() function is used to access integer custom parameters in VEX.

Which global variable provides the total number of primitives?

• P
• @primnum
• numprim
• @numprim

Answer explanation

@numprim is a global variable representing the total number of primitives.

What is the correct syntax to create a slider parameter in VEX?

• Using the slider() function
• Creating a channel reference in ch()
• Defining a custom UI
• Linking a global variable

Answer explanation

Slider parameters can be created using a channel reference with ch().

What is the difference between a custom parameter and a global variable?

• Custom parameters are predefined
• Global variables are user-defined
• Custom parameters are user-defined, global variables are predefined
• Both are the same

Answer explanation

Custom parameters are user-defined, while global variables are predefined.

How do you modify the value of a custom parameter in VEX?

• By redefining it
• By using the ch() function
• By using a Python script
• By accessing it in a SOP

Answer explanation

Custom parameters are modified using the ch() function in VEX.

Which of these is a global variable for velocity?

• @P
• @Cd
• @v
• @N

Answer explanation

@v is the global variable for velocity in VEX.

Can global variables be overwritten in VEX?

• Yes, directly
• No, they are read-only
• Only in specific contexts
• By using custom parameters

Answer explanation

Global variables can be overwritten directly in VEX to modify geometry attributes.

What does the chramp() function do in VEX?

• Creates a ramp parameter
• Accesses global variables
• Defines a channel
• Modifies point attributes

Answer explanation

The chramp() function is used to create and control ramp parameters in VEX.

How do you access a custom parameter for an integer array in VEX?

• chi()
• ch() with an array parameter
• chiv()
• chiarray()

Answer explanation

The ch() function can be used with array parameters to access integer arrays.