In order to include Trees in the SDA annual calculation, the new Annualtree material should be used. It combines the existing TransTree material to specify Summer and Winter materials for trees. The dates for Summer and Winter trees is specified in Project Settings > Climate Daylighting. This is a special material for SDA calculation and should not be used with any other calculations.
e.g. if the Annualtree material is used with Summer Start Date 21 March and Winter Start Date 21 September then the SDA calculation is run once for the Summer date e.g. 21 March to 20 September using the Summer tree material and once for the Winter date e.g. 21 September to 20 March using the Winter tree material. The results are then combined to give an overall annual result.
