ufoProcessPreRenderPass

    void ufoProcessPreRenderPass(
       ufoProcess process_instance,
       int        pass_number);

This function is optional. If supplied, it is called directly before each pass of rendering of any rectangular region of the UFO process outputs. ufoProcessPreRenderPass should be supplied if specific data initializations or allocations need to be performed before a particular rendering pass, where multiple rendering passes are required (see ufoProcessSetNumRenderPasses).

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