CODEWITHSUNDEEP
xnaxna-4.0sprite
Mathias Lykkegaard Lorenzen
Mathias Lykkegaard Lorenzen

Reputation: 15896

XNA SpriteBatch ignoring my culling options?

I'm having a problem with the XNA SpriteBatch object.

When I draw an element that is semi-transparent in front of other elements, the other elements are hidden entirely, until the semi-transparent element is entirely transparent. This is really frustrating because I am trying to make a fade-in and fade-out effect.

Batch.Instance.SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.AlphaBlend, SamplerState.LinearClamp, DepthStencilState.Default, RasterizerState.CullNone, null);

That is how I start my SpriteBatch. As you can see, I set it to CullNone, but it appears that it still does Z-culling.

How can I prevent this?

Upvotes: 0

Views: 703

Answers (1)

Andrew Russell
Andrew Russell

Reputation: 27245

Z-culling is a property of DepthStencilState. To turn it off you need to use DepthStencilState.None. The culling performed by RasterizerState is by triangle winding order. Which I already explained to you in detail here.

You cannot use the depth buffer with transparency. You can use alpha-testing as a work-around for "alpha cut-outs". However for semi-transparent objects (like when they are fading in and out), drawing them in depth-order is your only option.

Which I've already suggested to you here. You never answered my question there: why on earth are you drawing your GUI that way anyway?

For more information: I've gone into more detail about transparency and the Z-buffer here.

Upvotes: 3

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