Irrlicht Engine

hello!

in my 2d iso strategy game i want to select a tile by mouse. thats almost works fine but the tiles overlap (in most cases only the transparent areas overlap). Now my question: How can I find out to which texture a pixel, that i get from the cursor position, belongs?

hope you understood my problem

I don't know the answer to your question but what I do know is a place you might find it. www.GameDev.net has a good selection of articles about 2D isometric games in their reference section, you could do a lot worse than read your way through them.

Its an engine specified problem. the tutorials and articles on gamedev.net aren't usefull.

Take a look at the API. There are some functions, one is called something like "getRayFrom2DCursor" or something like that, and that shoots a 3d line into the world starting from the 2d co-ordinates of the mouse cursor.

Take a look, because it's entirely possible that the function you need is already in the API.

it's a 2d game......and I use draw2dImage() to draw the tiles.
before i started this thread i had looked for a function in the API.....but there is no, neither for ITexture nor the cursor control....

Is it better that you should be looking at your 2D map rather than selecting textures from the screen ?

i.e. translate your 3D cursor pos into 2D co-ordinates and look those up in your tilemap array.

1. the tile-images overlap. There ist a part of the images which is transparent and that part overlaps with other transparent ones.
2. I got the 2 position of the cursor by using a fuction of a ICursorControl instance.
3. the problem is that i don't know to which image the position belongs.

StuColliers tip isn't useful because i got the 2d coordinates of every image - but only the coordinates of the left upper corner.

Are all your "tiles" not the same size ?

If not you must know the size of each of the tiles to place them on the screen ? - if so just create an array of x,y,x1,y1 ?

Every tile got the same size - they look like this tile.
And i know the size of every tile for sure - the problem is the overlapping transparent area. in the picture the black background is transparent.

does no one know a solution?
maybe i have to modify the engine .................?

This is a paste from the irr documentation :

virtual void* irr::video::ITexture::lock ( ) [pure virtual]

Lock function. Locks the Texture and returns a pointer to access the pixels



You could use that fonction to check if the collising texture's pixel is (or not) the transparent color. If no, then COLLISION.