Right I still haven’t had much luck. My player still only moves in front of the tree and when he doesn’t he collides with it as it’s a solid. I’ve taken a different approach and found another tutorial (although my game isn't full isometric) involving placing image points on single objects.
Does the player need to be on the same layer as the tree (s) initially? I have 4: background, behind, players and infront.
I have a single ‘YCompare’ image point at the bottom of the tree, does it need to be on the player sprite AND on tree?
Does the tree object need to have the collision polygon filling the whole tree or just the bottom bit, like the player?
Do I need to add to my event sheet, and is there anything I don’t need to include?
Is there anything I need to check?