FIELDLAYER_CHANNELFLAG

FIELDLAYER_CHANNELFLAG_NONE	None.
FIELDLAYER_CHANNELFLAG_ENABLE	Layer is enabled and sampled.
FIELDLAYER_CHANNELFLAG_VALUE	Value sampling is enabled.
FIELDLAYER_CHANNELFLAG_COLOR	Color sampling is enabled.
FIELDLAYER_CHANNELFLAG_DIRECTION	Direction sampling is enabled.
FIELDLAYER_CHANNELFLAG_ROTATION	Rotation sampling is enabled.