2 replies to this topic

[Xcrypt]

Hey, I'm trying to make my engine support 2D rendering with Direct3D.

I can do that with:

D3DXMatrixOrthoOffCenterLH(&m_MatP2D, 0.0f,1.0f,0.0f,1.0f,0.0f,1.0f);
http://msdn.microsof...7(v=vs.85).aspx

Now, I would like depth buffering enabled for 2D. But I don't want it to interfere with the 3D graphics
(2D should always render "on top of" the 3D graphics)

What can I do to achieve that?

[Reedbeta]

Render the 3D graphics, then clear the depth buffer, and render the 2D graphics.

[TheNut]

You could save on some fillrate by reusing the depth buffer if you deal with opaque overlaps, but quite often I use transparency where I have to use a painters algorithm anyway. In this case I just disable depth reads/writes. Teh google found me this (see DepthEnable / DepthWriteMask).