# Tapered scaling effect with SubD and Vertex Tools?

I only just recently picked up SubD and Vertex tools and I think they’re probably the right tool for this job, but I haven’t learned them yet.

This is what I remember from school as a Boundary Value Problem: two regions of space where both the value and the derivative of the functions must equal each other at the boundary for the sake of smooth continuity. Here I have one region with waves and the other with flat water. I think Vertex Tools could scale the wave at the boundary to zero amplitude to match the flat water, and it’s selection tool could taper that effect off into the rest of the waves, perhaps? Am I heading in the right direction?

10 Likes

Like this?

2 Likes

That’s the general idea, though we’d like to scale the peaks down to average, and the troughs up to average. That’s with Fredo Scale, obviously. The waves got turned into a mesh first it would seem.

@RTCool, I know this is a follow up to your other post about the “Velocity Zone”. But wouldn’t the waves break at your seawall?

The sea wall gets inundated. To go really wild, you could go nuts modeling breaking waves, but I can’t even contemplate that modeling task yet. FEMA also has a diagram and formula to calculate crest and trough base on the depth of water, but even that’s more than I want to do. The main thing is locating the boundary line location from the FEMA map, whether that’s realistic or not, and how you turn that into a 3D diagram that’s more diagrammatic than real.

1 Like

Yup, that what I was thinking. Any way of controlling how far back the tapering effect goes? Cut the object with a plane some distance in?

Or like this:

1 Like

Or with Vertex Tools and controlling how far back the tapering effect goes:

3 Likes

That’s interesting, and some other day I’ll learn to play with that, but you do show how the tool does establish a fixed boundary condition.

That’s what I was thinking the tool could do. What I didn’t know was whether you had to use SubD first to make a mesh for the tapering effect.

I do not have SubD, I just created a surface similar to the one in your picture.

1 Like

How did you push/pull a surface from a line?

With Adebeo push line plugin: Extension | SketchUp Extension Warehouse

1 Like

If I remember right, TIG’s Extrude Tools can do that too…

2 Likes

thanks

1 Like

Another thought would be that as the crest and troughs become shallower, the peak to peak distance becomes shorter also. So maybe scaling successive sine waves might work? Prior to using the Extrude tools…

I actually generated a sine wave for the starting profile line. That’s in a separate post here.

Vertex Tools with a Soft Select Radius basically did what I thought. I had to do it to the top surface only and then patch the volume back together as the bottom was being influenced by the soft select radius.

The big surprise: With Vertex Tools, I can’t for the life of me select vertices with a Wacom tablet. It just refuses to work no matter how carefully I try.

1 Like