绘制到替代 RenderTarget2D 的问题，似乎绘制到后台缓冲区

因此，为了在旋转纹理后从纹理中获取 Color[] 数据，以便将此数据用于每像素碰撞，我使用以下方法将所述纹理(旋转(绘制到单独的 RenderTarget2D，然后将其转换回 texture2D 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(，首先纹理被绘制在屏幕上，并且返回的所有 Color[] 数据都是空的(即所有字段都等于 0(。

**编辑**使用 Texture2D.SaveAsPng(( 我可以看到 bufferTexture 是正确的大小，但完全透明，表明问题在于绘制缓冲区。