Reduce the radius of cylindrical object linearly towards the top

Question

I have an object that I have built using wall-factory ( a built-in addon). I have made it look cylindrical using the simple deform modifier (set to bend).

Now, I would like to know how I can reduce the radius linearly towards the top using modifiers. I have tried using lattice deform but it didn't work well. I would also like to have some kind of control over it like using an empty or some other object.

Answer 1

First method, using a Lattice and Lattice modifier.

Notes :

• Set the interpolation to Linear in the lattice properties.
• Scale the Lattice in Object mode so it encompasses the wall object.
• Go into Edit mode, and scale the top 4 vertices along the XY plane.

Second method, with a Simple deform modifier. Use a negative value to taper "down" your object.

I added an empty at world origin so the taper is centered, and used it as the modifier origin.

Third method, Geometry Nodes (V2.93+):

Basic steps of the modifier :

1. Add a GN modifier to the object.
2. Add a Transform Node to recenter the object (might not be needed if you changed the origin).
3. Add an Attribute Separate XYZ Node to retrieve the X, Y, and Z components of each vertex' position.
4. Add an Attribute Math node to downscale the Z attribute which we will use to taper the object.
5. Add an Attribute Combine XYZ node to combine the X and Y components which we will use to taper the object.
6. Use an Attribute Mix node set to subtract the X and Y components to the vertex' position, using the Z position as a factor.
7. Use a math node to downscale the Z factor before it is applied
8. Plug a new input into the math node.

Result :