XNA rendertarget sprite batch problem [closed]

Question

When using this code:

public static Texture2D ShowHealthBar(SpriteBatch spriteBatch,Texture2D empty, Texture2D full, float health)
    {

        spriteBatch.Begin();
        RenderTarget2D healthBarTarget = new RenderTarget2D(Game1.graphics.GraphicsDevice, full.Width, full.Height);


        Game1.graphics.GraphicsDevice.SetRenderTarget(healthBarTarget);
        spriteBatch.Draw(empty, new Vector2(0, 0), Color.White);
        Game1.graphics.GraphicsDevice.SetRenderTarget(null);

        spriteBatch.End();
        return (Texture2D)healthBarTarget;
    }

the texture is purple.

When inserting Game1.graphics.GraphicsDevice.Clear the texture has the clear color.

Why doesn't the sprite batch work?

Try moving your calls to GraphicsDevice.SetRenderTarget outside of your calls to SpriteBatch.Begin and SpriteBatch.End. — Seth Battin
– Seth Battin, Commented Apr 22, 2013 at 16:43

Seth Battin · Accepted Answer · 2013-04-22 17:22:14Z

The default behavior of SpriteBatch is to save its actual call to the GPU until you call .End(), rather than immediately (available by optional argument) when you call .Draw(). This allows it to reduce the total number of draw calls it makes, which is an important optimization. But switching the render target back before calling End() means that the draw goes to the wrong place, not the RenderTarget that was set when you called Draw().

So, call End() before switching the target back to the default.

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