Adding a Fillet of a set radius between two surfaces
› DELFTship forum › Hull modeling › Adding a Fillet of a set radius between two surfaces
Tagged: Fillets
 This topic has 3 replies, 2 voices, and was last updated 2 years, 9 months ago by Terrance Egolf.

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August 12, 2021 at 10:38 #44237Hull.01Participant
Hello, I am new with Delftship modeller so I will be asking some questions here.
The first one is, How do you introduce a fillet radius of exactly certain radius (for example 0.1m) between these two perpendicular surfaces
1 – horizontal surface – the bottom
2 – vertical surface – the side

August 13, 2021 at 11:24 #44240Hull.01Participant
It looks like one way of doing this is by introducing a Cylinder 3D primitive at the right position and then ‘merge it’ with the two surfaces. It would be convenient to have a Trim function.
Any other ways of doing this?

August 13, 2021 at 22:07 #44253Hull.01Participant
Hello, I am new with Delftship modeller so I will be asking some questions here.
The first one is, How do you introduce a fillet radius of exactly certain radius (for example 0.1m) between these two perpendicular surfaces
1 – horizontal surface – the bottom
2 – vertical surface – the side
This is exactly what I want to do:
https://www.youtube.com/watch?v=YuOSUcNEaM&list=PL49299184716EDEF2&index=9To introduce a bilge radius in a parallel midbody section of the ship.
How is this done in Delftship?

August 20, 2021 at 00:04 #44254Terrance EgolfParticipant
Hello, Hull.01.
I don’t believe the construction you are seeking is possible using DELFTship because it uses a subdivision process to create the hull surface. In other words, the surface is mathematically interpolated in 3D space using the positions of control curves. To transition from a planar to a cylindrical surface at the edge of a fillet results in the departure from a plane before the juncture and/or the deformation of the cylindrical fillet surface.
Here are the two possible scenarios in DELFTship:
1. Use a crease edge at the juncture with a cylindrical cross section for the fillet. The surface shows a sharp break at the crease edge (these images used a 12point cylinder).
2. Removing the crease edge, using a 12point fillet cylinder:
The only option you have is to increase the number of points in the fillet cylinder section. With crease edges at the joint between the plates and the cylinder section, you can approach (but never achieve) a smooth tangent with the fillet surface (this one is based on a 24point cylinder).
Hope this helps.
Terry
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