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Anti-alias seems does not work

Last post 3/31/2009 5:18 PM by Shawn Hargreaves. 6 replies.
  • 11/20/2008 3:18 PM

    Anti-alias seems does not work

    Reply Quote
    Hi all!

    What is wrong with the code which I try to turn on the anti-alias feature? (using c# 2008 and XNA 3.0)

                graphicsDevice = new GraphicsDevice(GraphicsAdapter.DefaultAdapter, 
                                                    DeviceType.Hardware, 
                                                    windowHandle, 
                                                    parameters); 
                 
                //Antialias 
                graphicsDevice.RenderState.MultiSampleAntiAlias = true; 
                graphicsDevice.PresentationParameters.MultiSampleType = 
                        MultiSampleType.SixteenSamples; 
                graphicsDevice.PresentationParameters.MultiSampleQuality = 8; 
     

    Thank you in advance.
  • 11/20/2008 3:48 PM In reply to

    Re: Anti-alias seems does not work

    Reply Quote
    Why do you say it doesn't seem to work?
    Jim Perry - Microsoft XNA MVP
    If people spent a minute searching the forums and reading the FAQs before posting I'd be out of a job.
    Got some XNA Game Studio/XNA Framework development info to share with the community? Put it on the XNA Wiki.
    Please mark posts as Answers or Good Feedback when appropriate.
  • 11/20/2008 4:41 PM In reply to

    Re: Anti-alias seems does not work

    Reply Quote
    That's not how you turn on multisampling. You specify this in the parameters when you create the device. You can't (at least not easily) change it afterward.
    XNA Framework Developer - blog - homepage
  • 11/20/2008 6:29 PM In reply to

    Re: Anti-alias seems does not work

    Reply Quote
    Jim Perry:
    Why do you say it doesn't seem to work?


    Because the objects are not build as they could be if the antialias were turned on.
  • 11/20/2008 7:07 PM In reply to

    Re: Anti-alias seems does not work

    Reply Quote
    Like Shawn mentioned changing the presentation parameters after you've created the device will have no effect.  You'd have to reset the device using the new parameters for them to take effect.

    Also, I know of no GPU that supports 16 sub-samples for multisampling.  For example the mode names "16x" that you see on Nvidia's 8000 and 9000 series actually uses 4 samples, with a quality level of "2" IIRC.  The most those GPU's support is 8 sub-samples, which corresponds to the "8xQ" and "16xQ" settings.
    Matt Pettineo | DirectX/XNA MVP


    Ride into The Danger Zone | PIX With XNA Tutorial
  • 3/31/2009 7:21 AM In reply to

    Re: Anti-alias seems does not work

    Reply Quote
    And is there a way to make a postprocess with multisampling?
  • 3/31/2009 5:18 PM In reply to

    Re: Anti-alias seems does not work

    Reply Quote
    Scyde:
    And is there a way to make a postprocess with multisampling?


    Sure. Make a mutlisampled rendertarget, draw your scene to it, then apply the postprocess. This works the same regardless of whether you are multisampling or not, it all just depends on whether you create the rendertarget with multisampling or not.
    XNA Framework Developer - blog - homepage
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