DELFTship forum Hull modeling Adding a Fillet of a set radius between two surfaces

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• #44237

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

• #44240

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?

• #44253

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:

To introduce a bilge radius in a parallel mid-body section of the ship.

How is this done in Delftship?

• #44254

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 12-point cylinder). 2. Removing the crease edge, using a 12-point 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 24-point cylinder). Hope this helps.

Terry