Im pretty new to this whole mess of directx programing in c++ so please correct me if my approach to sprite rendering is wrong. Im trying to code a sprite system that changes according to my change in resolution. I found a way that worked great on my workstation computer (that has a widescreen running at 1440x900). I set up my whole interface at this resolution and now i want to change it or at least allow a fullscreen monitor to display my sprites properly. I am rendering sprites in this manner: 1. Initializing the D3DXSprite Interface using LPD3DXSPRITE d3dspt; 2. Loading a Texture using LPDIRECT3DTEXTURE9 and D3DXCreateTextureFromFileEx(p_dx_Device, // the device pointer "title1.png", // the new file name SCREEN_WIDTH, // default width SCREEN_HEIGHT, // default height D3DX_DEFAULT, // no mip mapping NULL, // regular usage D3DFMT_A8R8G8B8, // 32-bit pixels with alpha D3DPOOL_MANAGED, // typical memory handling D3DX_DEFAULT, // no filtering D3DX_DEFAULT, // no mip filtering D3DCOLOR_XRGB(255, 0, 255), // the hot-pink color key mask NULL, // no image info struct NULL, // not using 256 colors &sprite); // load to sprite 3. And then drawing the texture in this manner: RECT part; SetRect(∂, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT); D3DXVECTOR3 center(0.0f, 0.0f, 0.0f); D3DXVECTOR3 position(0.0f, 0.0f, 0.0f); d3dspt->Draw(sprite, ∂, &center, &position, D3DCOLOR_ARGB(255, 255, 255, 255)); I am assuming that this is the proper way to do this. My problem is that when I run this on a fullscreen monitor at say 800x600 it displays wrong. (on my widescreen it renders everything fine even if the resolution is set at 800x600) I was assuming that direct x would stretch all the images to the height and width settings in D3DXCreateTextureFromFileEx. This code works completely on my widescreen. I run this equation on all my images and where it draws them: (Natural_Image_Width*Current_Screen_Resolution_Width/1440) and (Natural_Image_Height*Current_Screen_Resolution_Height/900) because i set the interface up on 1440x900. Is this how resolution is handled in normal directx programs? Any help would be appreciated... Thanx, Nil

Thanx guys... Both of you provided me with some very useful info. But I'm still a little confused why if I run the program 800X600 on my widescreen the equation I used works but when I render 800x600 on a fullscreen monitor the sprites don't fit properly.

the rect is the designated area for the animations (showing only part of the image)
it displays more of the image than i want if i use NULL

OMG i think you may be right.... that makes sense really but one card is a geforce fx5900 and other is an ati radeon 9700... both are less than 5 years old. my widscreen is far newer than the other two... is support of non-power-of-2 textures something new? is there a function that checks that like in d9caps?
D3DPTEXTURECAPS_NONPOW2CONDITIONAL is what ive found

thanx MJP ill play with this a while (I probably should do power of 2 on all images just for compatability's sake. I just assumed...too much)

yep you nailed it... it was the mip map thing... it now works on all 3 comps (there is a variation on the ati card so i'm gonna try the transform thing now) thanx again MJP