VEX Data Types 2

How do you declare a global attribute in VEX?

• Using the @ symbol
• Using the #define directive
• By prefixing with $
• By declaring it outside a function

Answer explanation

Global attributes are accessed and declared in VEX using the @ symbol.

Which of the following is a valid VEX variable name?

• 1var
• _variable
• float
• @attr

Answer explanation

Valid VEX variable names can start with an underscore and cannot be keywords like 'float'.

What is the primary difference between attributes and variables in VEX?

• Attributes are local, variables are global
• Attributes are stored with geometry, variables are temporary
• Attributes are faster to access
• Variables can only hold integers

Answer explanation

Attributes are stored with geometry and persist across nodes, while variables are temporary.

How do you declare an integer variable in VEX?

• int myVar;
• integer myVar;
• int32 myVar;
• number myVar;

Answer explanation

An integer variable in VEX is declared using 'int' followed by the variable name.

Which data type would you use to store RGB color values in VEX?

• Matrix
• Vector
• Array
• Float

Answer explanation

RGB color values are typically stored as a vector in VEX.

How can you modify an existing attribute in VEX?

• By assigning a value directly
• By using the @ symbol and reassigning
• By creating a new node
• By running a Python script

Answer explanation

Attributes can be modified in VEX using the @ symbol and reassigning a new value.

What is the function of a detail attribute in VEX?

• It stores per-geometry data
• It stores per-point data
• It modifies shader properties
• It changes rendering settings

Answer explanation

Detail attributes store per-geometry data in Houdini.

Which keyword is used to declare a constant in VEX?

• const
• constant
• static
• define

Answer explanation

The 'const' keyword is used to declare constants in VEX.

What does the length() function do in VEX?

• Calculates the length of a string
• Calculates the magnitude of a vector
• Returns the size of an array
• Measures the length of geometry

Answer explanation

The length() function calculates the magnitude of a vector in VEX.

How do you declare an array in VEX?

• array myArray[];
• int[] myArray;
• float myArray{};
• arr myArray[];

Answer explanation

Arrays in VEX are declared with square brackets after the data type, e.g., int[].