Cutting mass under an angle

[adverflex]

Hello!
I have wandered off into some trouble.
The chimney of my house is basically an elliptical cylinder. I planned the chimney to be sloped, but I do not know how do make the cylinder sloped at one of the sides. I made the chimney by massing. Solid extrusion.
Can you please help me?
Thank you!

[Dimitri Harvalias]

Welcome to the forums.
You'll need to edit your chimney family and add a void to cut the extruded cyclinder to match the roof slope.
Be sure the in-place family you create is not a 'mass' object. Masses should not be used to represent real geometry in a model. Create it in the wall family category.

[adverflex]

Thanks! I found your way a little confusing.... since im pretty new to Revit. I found a way to use Viod extrusion. :) thx!