2.8.4.6 Control Flow Directives

Conditionally parse a section of the scene file, depending on a boolean expression:

IF_DIRECTIVE:

#if ( BOOL ) TOKENS [#else TOKENS] #end

TOKENS:

Any number of POV-Ray keywords, identifiers, values and/or punctuation.

Conditionally parse a section of the scene file, depending on the existence of an identifier:

IFDEF_DIRECTIVE:

#ifdef ( IDENTIFIER ) TOKENS [#else TOKENS] #end

IFNDEF_DIRECTIVE:

#ifndef ( IDENTIFIER ) TOKENS [#else TOKENS] #end

Conditionally parse a section of the scene file, depending on the value of a float expression:

SWITCH_DIRECTIVE:

#switch ( FLOAT ) SWITCH_CLAUSE... [#else TOKENS] #end

SWITCH_CLAUSE:

#case ( FLOAT ) TOKENS [#break] |
#range ( F_LOW, F_HIGH ) TOKENS [#break]

Repeat a section of the scene file while a boolean condition is true:

WHILE_DIRECTIVE:

#while ( LOGICAL_EXPRESSION ) TOKENS #end

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