[quote user="DarkSquirrel"]I don't think the blend mode is intentionally available during Immediate mode[/quote] I get the same impression, although why else would it be available at all? Maybe it's just an artifact of the conversion to MDX? [quote user="DarkSquirrel"]It would be cool to have a ...

[quote user="DarkSquirrel"]Unless the default rendering mode for SpriteBatch is SpriteSortMode.Immediate (which, unfortunately, the MSDN docs do not specify) all rendering is deferred until the call to SpriteBatch.End.  Because all rendering is encapsulated within that call, there's no way to indirectly change the blend ...

[quote user="Craig Martin"]You might have to call below after changing them if it is inside a begin/end block. GraphicsDeviceManager.ApplyChanges();[/quote] No luck. :(

[quote user="Craig Martin"]Alpha blending requires a not-fully-opaque alpha component in your color right? But Color.Green and Color.Red have have 255 as their Alpha component. What happens if you use a smaller alpha value, like new Color(Color.Green, 128) and new Color(Color.Red, 64) ? Or maybe thats wrong because you said ...

I've reduced my frustration to the simple example shown below starting from a brand new Windows Game. "circle" is just a 512x512 white circle with a transparent background. By any estimation I can muster, this combination of SourceBlend and DestinationBlend should produce additive blending, but all that comes out is a red circle ...