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Creating Data Items

Data Items

Specifying Literals

 

SDL: The Alias Scene Description Language > Scene Description Language Reference > Data Items > 

Declaring Variables

Variables are defined and named in the DEFINITION section of the SDL file.

Keep the following in mind when using variables:

• The order in which data items are defined is significant: you can only reference data items that were defined previously in the text file.
• You can define variables in terms of other variables and literal values.
• Every variable must have a unique name (all variables exist in the same name space).
• You cannot define a variable more than once.
• Once variables are defined, they persist until the end of the file.
• Names of variables follow the same rules and use the same character set as in the C language specification. Case is significant.
• Each data type (with the exception of arrays, which collect other data types) has a list of components that must be given values. If you do not assign a value to a component, a default value will be used.