Hello again,
My question is how would one go about rendering a texture on a quad that sit's behind a 3D object. Im sure Z-ordering is invloved in some way but I have yet to come across a structure that explicitly lets you set such a parameter
Maybe Multiple Render targets?
I am using D3D11 and C++, any help will be appreciated, thanks!
-Marcus Hansen
I'm not well versed in DX specifically, but in theory, this should be a very simple task.
If you're trying to draw it in 3d (using a textured quad) you'd just draw the quad first with a Z position behind everything else.
You need to make sure you draw the textured quad first, as Jutaris mentioned, or in a more common scenario, make sure you have created a depth buffer, its write flag is "less" or "less or equal" and depth testing (a.k.a. z-testing or reading from the depth buffer) is enabled*. This will allow you to draw non-transparent objects in random order in your scene.
* the same applies to depth masking (eg the flag that tells the API whether it should write into the depth buffer or not)
If you're drawing non-transparent objects, you should draw them with depth testing enabled. You do this by creating a depth-stencil state object and binding it to the pipeline.
http://msdn.microsoft.com/en-us/library/windows/desktop/bb205074(v=vs.85).aspx
Make sure you draw objects front to back (so first the 3D object and then the quad) to avoid overdraw. Because the first object's z-buffer value makes the quad's depth test fail, you don't have to run the pixel shader twice.
