Global Settings

Specify various settings that apply to the entire scene
GLOBAL_SETTINGS:: Jump to SDL; global_settings { GLOBAL_SETTING_ITEMS }
GLOBAL_SETTING_ITEMS:: [adc_bailout FLOAT] & [ambient_light COLOR] & [assumed_gamma FLOAT] & [hf_gray_16 [BOOL]] & [irid_wavelength COLOR] & [charset GLOBAL_CHARSET] & [max_intersections INT] & [max_trace_level INT] & [number_of_waves INT] & [noise_generator NG_TYPE] & [RADIOSITY] & [PHOTONS]
GLOBAL_CHARSET:: ascii | utf8 | sys
NG_TYPE:: 1 | 2 | 3

Enable radiosity to compute diffuse inter-reflection of light:
RADIOSITY:: Jump to SDL; radiosity { [RADIOSITY_ITEMS] }
RADIOSITY_ITEMS:: [adc_bailout FLOAT] & [always_sample BOOL] & [brightness FLOAT] & [count INT] & [error_bound FLOAT] & [gray_threshold FLOAT] & [load_file FILE_NAME] & [low_error_factor FLOAT] & [max_sample FLOAT] & [media BOOL] & [minimum_reuse FLOAT] & [nearest_count INT] & [normal BOOL] & [pretrace_end FLOAT] & [pretrace_start FLOAT] & [recursion_limit INT] & [save_file FILE_NAME]

Enable photon mapping to render reflective and refractive caustics:
PHOTONS:: Jump to SDL; photons { PHOTON_QUANTITY [PHOTON_ITEMS] }
PHOTON_QUANTITY:: spacing FLOAT | count INT
PHOTON_ITEMS:: [gather I_MIN, I_MAX] & [media I_MAX_STEPS [, F_FACTOR]] & [jitter FLOAT] & [max_trace_level INT] & [adc_bailout FLOAT] & [save_file FILE_NAME] & [load_file FILE_NAME] & [autostop FLOAT] & [expand_thresholds F_INCREASE, F_MIN] & [radius [FLOAT, FLOAT, FLOAT, FLOAT]]