Hello, I made pie graph Shader But, I don't know How To make shadow

Okay, I made pie chart but I don’t know how to make shadow in detail?

for example i show image,

I want to make same shadow with original pie graph.
Would you modify upload file (shader file)?

Help me.

7266310–876982–PieGraph.shader (4.09 KB)
7266310--876985--image.png

You need a custom shadow caster pass that calculates the alpha in the same way as your existing shader, but then uses clip(alpha - 0.5); to discard the invisible pixels.

See Implementing shadow casting on this page:

um, I understand but very difficult to me.
Would you show an example?