2D sprites and ambient light

Graphics and GPU Programming Programming

Started by DemonLord April 21, 2012 03:00 PM

2 comments, last by Nokame 11 years, 11 months ago

344

Author

April 21, 2012 03:00 PM

Hi.

I want to make all sprites that are not in my spot light to be hardly visible.
Only when I come near enough to light them up with my spot light should
they be fully visible.

This is how it looks:
[media]

[/media]

Question is: How do I make sprites less visible when not in my spot light?

Thanx for help.

DemonLord

344

Author

April 25, 2012 06:27 PM

I have a question about BlendState.

Is it possible to make sprites outside of my spot light blend into dark ambient light with BlendState?

I kinda made sprites in my spot light translucent and those far away normal but I don't really know if I can make them blend with the ambient light

This is what I use to make the effect on the screenschot:



private Color _ambientLight = new Color(.1f, .1f, .1f, .1f); // for HLSL



public static BlendState BlendBlack = new BlendState

{

   ColorBlendFunction = BlendFunction.Add,

   ColorSourceBlend = Blend.One,

   ColorDestinationBlend = Blend.One,



   AlphaBlendFunction = BlendFunction.Add,

   AlphaSourceBlend = Blend.SourceAlpha,

   AlphaDestinationBlend = Blend.One

};

Any help or tip would be helpful.
Thanx

FalconDragoon

485

May 18, 2012 09:35 PM

Well, for one, I don't think you want to toy with the Alpha (bringing that down is what'll make them translucent).

Additionally, if that's a 3d light (as I assume it is) you could just render the sprites on textured quads. Could be more effort up front, but give you the visual effect you're after.

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