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Blending ... Semi Transparency...?

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I can get colorkeying to work so that all of one color is transparent...I am now wondering how to get all of the image to fade out? I am creating a simplistic particle system and would like to fade out the particles. How would I go about doing this in DirectX9?

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you must modify the alpha value of the D3DMATERIAL9::Diffuse, and set the material to the object

before rendering anything, set these render states to the device :

_device->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA );
_device->SetRenderState( D3DRS_ALPHABLENDENABLE, TRUE );

I don't know what you are using on for your transparent textures, but you better use alpha channels on the texture in order to make transparent areas (with tga pics)
you must also set texture stage states in order to do alpha operations

// select alpha from alpha channel of the texture
_device->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
// select alpha from material
_device->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
// mix these two arguments together
_device->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);

to do fade out , just decrease the diffuse alpha value from 1 to 0 on each frame

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