Antialiasing troubles - c++

Question

When full-scene antialiasing is enabled, I have some troubles when rendering to texture.
Here's an image of what is hapenning (rendered image has some edges).
http://i.imgur.com/VcFNn.png
When AA is off - nothing of this happening, and all goes ok.
Why might I experience these troubles, and what is the correct way to render to texture while AA is on?
Thanks in advance.

Answer 1

The first thing you should do is to make sure your game is capable to run full scene anti-aliasing (thats is to assume you have a ready graphics card for the job). The way to do that is by doing this:
/*
* The code below assumes that pD3D is a valid pointer
* to a IDirect3D9 interface.
*/
if( SUCCEEDED(pD3D->CheckDeviceMultiSampleType( D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL , D3DFMT_R8G8B8, FALSE,
D3DMULTISAMPLE_2_SAMPLES, NULL ) ) )
// Full-scene antialiasing is supported. Enable it here.
If the device supports it then all you have to do is set up the parameters for multi-sampling:
/*
* The example below assumes that pD3D is a valid pointer
* to a IDirect3D9 interface, d3dDevice is a pointer to a
* IDirect3DDevice9 interface, and hWnd is a valid handle
* to a window.
*/
D3DPRESENT_PARAMETER d3dPP
ZeroMemory( &d3dPP, sizeof( d3dPP ) );
d3dPP.Windowed = FALSE
d3dPP.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dPP.MultiSampleType = D3DMULTISAMPLE_2_SAMPLES;
pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &d3dDevice)
Hope this helps!