import c4d
from c4d import gui

# Main function
def main():
	# Get V-Ray preferences
	vrayPreferences=c4d.plugins.GetWorldPluginData(1053273)
	if (vrayPreferences):
		currentPreviewLog = vrayPreferences.GetBool(1004)
		# Toggle the preview
		newPreviewLog = not currentPreviewLog
		# Set the value in preferences
		vrayPreferences.SetBool(1004, newPreviewLog)
		print("Material preview log set to {}".format(newPreviewLog))

# Execute main()
if __name__=='__main__':
	main()