Patch Environment Design Help - Guitar Neck
Hi @oldtbone55,
I think that this is just the nature of the TSpline smoothing algorithm. If you look at it in Box mode, you can see that the edge was inserted where you specified.
However, when the TSpline smooth faces are calculated, you can see that the apparent edge is inserted farther away.
I am not familiar with the math behind TSplines, but I suspect that it is because these faces are so long and narrow. Short of adding more edges along the length of your neck, I'm not quite sure how to get what I think you want. Others might have better ideas.
Jeff
Jeff Strater
Engineering Director
"I'm trying to insert the t-spline edge close to the neck end where it joins the head stock. For whatever reason, the t-spline seems to insert itself much farther away than I want, not matter how close I move it to the end of the neck/headstock transition. Am I doing something incorrectly or is this a problem with the program?"
No you are not doing anything wrong, the reason this is happening is because of surface tension. The only way to stop this is to add a bunch of edge loops all the way down the neck. This is why if you look at the initial T-Spline model I showed you how to make I had a bunch of them down the neck. Surface tension is the reason most people have trouble with T-Splines because they don't understand it.
T-Spline by nature are G2 curvature across the spans (unless you crease an edge) so when you place an edge loop the T-Spline math has to achieve this and the only way to do it is to move the edge loop into the required location. Remember that you are modifying the control cage which works a lot like CV curves. What you are expecting to happen is for it to act like through point curves, but it doesn't work that way. There is no way to gauge how to land a edge loop exactly where you want it with the current tools. This is why I use Topogun because it allows me to do what Fusion can't, but that is a whole other story because retopo also has a steep learning curve.
Phil Procario Jr.
Owner, Laser & CNC Creations
Box mode is your T-Spline quality control. If things look smooth in box mode then they'll be fine in smooth mode, but as you've now observed not necessarily the other way around.
That's also why you start with not too much geometry and the shape as close as you can. Then when you come across situations like this where you can see that in box mode you have to stretch things too much too far, you'l add edge loops (geometry) to give you a bit more control over the geometry. With that approach you mostly have to fine-tune and edit smaller changes in localized areas and not have to deal with editing all of the now increased numbers of vertices.
If you do need to edit a higher number of vertices, try to experiment with "soft modification". But remember, T-Slines want to e treated gently 😉
I think it is because you have symmetry turned on. Try removing the symmetry and doing the bridge afterwards.
Phil Procario Jr.
Owner, Laser & CNC Creations
You have double faces all the way down the neck. This is very problematic when working in T-Splines. You have to be very careful when using symmetry or you end up with headaches like this.
You going to have to go through your entire T-Spline model to remove the duplicate faces.
Phil Procario Jr.
Owner, Laser & CNC Creations
It's hard to say exactly how it happened, but I have seen this in the past if you turn symmetry on and then model past the center line.
One indicator that you have duplicate faces is when you see a thick black line in the middle of you T-Spline. This indicates an edge that is not connected or creased, so if you see that and you know it is not creased check that area for duplicate faces.
You still have two duplicate faces in your T-Spline body on the bottom of the heal.
I will upload the video as soon as it is ready.
Phil Procario Jr.
Owner, Laser & CNC Creations
