How to bloom a specific color or sprite?

I've been using the following example code to create bloom effects in my project:

http://create.msdn.com/en-US/education/catalog/sample/bloom

How can I change/configure this to bloom only a certain colour or a certain object (eg - a specific sprite)?

I tried the following (to bloom only the lasers), but it doesn't work:

protected override void Draw(GameTime gameTime)
{
bloom.BeginDraw();
bloom.Settings = BloomSettings.PresetSettings[7]; //bloom off

GraphicsDevice.Clear(Color.Black);

spriteBatch.Begin(SpriteSortMode.Deferred,
BlendState.AlphaBlend, SamplerState.PointClamp,
null, null, null);

if (bombs.bombsAlive > 0)
bombs.Draw(spriteBatch);

spriteBatch.End();

bloom.Settings = BloomSettings.PresetSettings[6]; //bloom on
spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.AlphaBlend,
SamplerState.PointClamp, null, null, null);

if (lasers.lasersAlive > 0)
lasers.Draw(spriteBatch);

spriteBatch.End();

bloom.Settings = BloomSettings.PresetSettings[7]; //bloom off
spriteBatch.Begin(SpriteSortMode.Deferred,
BlendState.AlphaBlend, SamplerState.PointClamp, null, null, null);

if (enemies.enemiesAlive > 0)
enemies.Draw(spriteBatch);

if (projectiles.bulletsAlive > 0)
projectiles.Draw(spriteBatch);

spriteBatch.End();

base.Draw(gameTime);
}

I've tested my bloom settings 6 and 7 individually, and they work as they should, when tested on a complete scene. BloomSettings.PresetSettings[6] creates bloom while BloomSettings.PresetSettings[7] has no bloom effects.

Anyone have any ideas?

1 Reply

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time and space15y ago
I think I sort of know why the whole scene is being bloomed, it's because everything is being drawn to a single render target, so no matter what point I turn to bloom on/off the last setting will always be the one I see. So, I guess my question is - how do I render to multiple render targets and merge them? Or, is there are more elegant solution?