Hello All!! How can I create an alpha-only surface in DirectX? Please tell me... Thomas

i think you set the pixelformat flag with DDSCAPS_ALPHA.

I have tried it but DirectX have returned a error DDERR_INVALIDCAPS. Actually, I wanted to display a 3D model with the bitmap and the alpha bitmap in 16 BPP display model, so I thought that I should create one alpha-only surface and one surface to store them, and use alpha blend and multi-texture function in DirectX to show the 3D model. Am I right? or have any better method? or have any good source for me to do this? Thank your help!!

Thomas