C# 绘制到备选RenderTarget2D的问题，似乎绘制到backbuffer

因此，为了在纹理旋转后从纹理中获取颜色[]数据，以便使用该数据进行逐像素碰撞，我使用以下方法绘制旋转到单独RenderTarget2D的纹理，然后将其转换回纹理2D并从中获取颜色数据：

public Color[] GetColorDataOf(SpriteBatch spriteBatch, Texture2D texture, float rotation)
    {
        // Get boundingBox of texture after rotation
        Rectangle boundingBox = GetEnclosingBoundingBox(texture, rotation);
        // Create new rendertarget of this size
        RenderTarget2D buffer = new RenderTarget2D(GraphicsDevice, boundingBox.Width, boundingBox.Height); 

        // Change spritebatch to new rendertarget
        GraphicsDevice.SetRenderTarget(buffer);
        // Clear new rendertarget
        GraphicsDevice.Clear(Color.Transparent);

        // Draw sprite to new rendertarget
        spriteBatch.Draw(texture, new Rectangle(boundingBox.Width / 2, boundingBox.Height / 2, texture.Width, texture.Height), null, Color.White, rotation, new Vector2(boundingBox.Center.X, boundingBox.Center.Y), SpriteEffects.None, 1f);

        // Change rendertarget back to backbuffer
        GraphicsDevice.SetRenderTarget(null);

        // Get color data from the rendertarger
        Color[] colorData = new Color[boundingBox.Width * boundingBox.Height];
        Texture2D bufferTexture = (Texture2D)buffer;
        bufferTexture.GetData(colorData);

        return colorData;
    }

现在我有两个问题，我希望它们是链接的，首先纹理在屏幕上绘制，返回的所有Color[]数据都是空的，即所有字段都等于0

**编辑**

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使用Texture2D.SaveAsPng，我可以看到bufferTexture的大小是正确的，但完全透明，这表明问题在于如何绘制缓冲区

所以我把它修好了。事实证明，我需要创建另一组SpriteBatch.Begin和SpriteBatch.End调用，它们位于我绘制到新渲染目标的位置附近，否则它只是绘制到backbuffer