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Centre view on a circle (Directx/Direct3d)

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  • 02-05-2006 1:10pm
    #1
    Mutant_Fruit
    Closed Accounts Posts: 4,943 ✭✭✭


    Basically, i have a little app going on where the app renders a direct3d surface, and the user can click on various items that are being rendered so they can centre the view on that item.

    Now, the problem i'm having is that i can't make the view centre on one of the objects by using a mouseclick. I can get the mouseclicks coordinates relative to the 3d window. i.e. i can say they were at coordinates 100,200 i.e. 100 to the right and 200 down from the top left corner. I can then take those coordinates, and remap them slightly so as to tell which way i should move the view. I can get it so that the view moves in the right direction, but i can't make it move the right distance. i.e. they'd click on a circle in the top left, and it would move up and left BUT it woudl move much to far.

    So how can i convert the mouse coordinates into proper "directx" coordinates so i can tell on what item they clicked on in the direct3d window. A perfect example of what i mean is demonstrated in www.liveplasma.com. You can select items by "clicking" on them. How can i achieve the same effect.

    I'm coding in C# using managed directx.


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    #2
    Blowfish
    Registered Users Posts: 5,112 ✭✭✭Blowfish


    I haven't done it using directx, as i'm an opengl man, but the correct phrase for it is 'picking' theres a link here, but if that is no good just google 'directx picking' and you should find something.


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    #3
    Mutant_Fruit
    Closed Accounts Posts: 4,943 ✭✭✭Mutant_Fruit


    Thats brilliant. I've been googling the problem a bit, but i havn't come across "picking" as of yet (most of my problem was i didn't really know what term i was supposed to google).

    I'll give that a shot later on today. Hopefully i can make it work for me.


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