Collision with only certain backdrops, not all

[ffomega]

I have a large frame - 6400 x 3200 (because I am using large-tile maps) for an isometric engine I am making. I want to use all background objects for the scenery and obstacles, while using active objects for things like treasure chests and characters.

I'd like to use the condition "if player collides/overlaps background"

but when I do that, the character reacts to all backdrops. Is there a way (for instance I want him to stop moving) for me to have the character only react to certain backdrop objects instead of all of them? I fear that unless I use all backdrop objects for static objects that are not going to move, I will bog the game down since all the game's levels will be rather large due to the size of tiles I am using.

Thanks

[MuddyMole]

Just don't set them as obstacles.

[UltimateWalrus]

If I were you I'd set the display mode to Direct3D 9 and not worry about the performance due to tile size until it becomes a problem. Modern graphics cards are quite powerful and thankfully MMF's hardware acceleration takes advantage of this now.

Here are a couple things for you to consider:

---By "isometric," do you mean this type of perspective? If so, how would you order the player object when it moves behind a backdrop? Would the player need to be able to move past a backdrop if it's on a different 3d plane? These are all things that can't be done with a static backdrop.
---Have you heard of Isometric Grid Object 2? It's a very good extension, I used it to make Isopark.