WPF DropShadowEffect on a transparent object

Question

I want to be able to see a drop shadow, but not the object that is creating the drop shadow.

The code below will only work if I give the ellipse a fill colour.

<Ellipse Width="640" Height="640">
    <Ellipse.Effect>
        <DropShadowEffect Color="Cyan" BlurRadius="60"  />
    </Ellipse.Effect>
</Ellipse>

This makes sence as an invisible object wouldn't have a shadow. But, what if I really wanted it to? Is there a way to make this happen?

Answer 1

Are you looking for this? Or are you expecting the entire shadow to appear? If later, did you try making the ellipse transparent by setting the alpha value to zero?