GH intersect

Dear all, I use solid difference in GH as shown on 1.png. The result is not what I expected. I expect the result should be as the same with 2.png.
Do I make any mistake in my GH?? If yes, what part should be corrected?

test intersect.gh (9.8 KB) test intersect.3dm (80.3 KB)

Flip the axis of your revolution surface you’re using to subtract.

Hi, Martin, you are right. Thanks for your help!

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Thanks! Please click the solution box if the problem is solved.

PS: next time you could internalize the required input data in your Grasshopper file by right clicking a component. You’d only have to upload the GH definition and no Rhino file. It’s also quicker for anyone who’s helping you…