POV-Ray : Documentation : Comments
  POV-Ray 3.6 Documentation Online View Identifiers and Keywords Float Expressions Comments

Comments are text in the scene file included to make the scene file easier to read or understand. They are ignored by the ray-tracer and are there for your information. There are two types of comments in POV-Ray.

Two slashes are used for single line comments. Anything on a line after a double slash (//) is ignored by the ray-tracer. For example:

 // This line is ignored

You can have scene file information on the line in front of the comment as in:

 object { FooBar } // this is an object

The other type of comment is used for multiple lines. It starts with "/*" and ends with "*/". Everything in-between is ignored. For example:

 /* These lines
    are ignored
    by the
    ray-tracer */

This can be useful if you want to temporarily remove elements from a scene file. /* ... */ comments can comment out lines containing other // comments and thus can be used to temporarily or permanently comment out parts of a scene. /* ... */ comments can be nested, the following is legal:

 /* This is a comment
 // This too
 /* This also */

Use comments liberally and generously. Well used, they really improve the readability of scene files. Identifiers and Keywords Float Expressions

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