It looks like this is part of another multi-thread of troubleshooting. I’d recommend keeping it all together in one location.
That being said, you’re feeding a list of Lines into the X&Y inputs of the Point node. You need to be feeding numbers into those inputs, not Lines.
can I have a graphe?
No, because I genuinely don’t know what you’re trying to do with this graph. I took a peek in the other topic - It looks like you were working on learning how to generate surfaces? I don’t know what you intend the ‘next step’ to be here once you have a compiled list of lines, or what you’re looking for in a final result.
I’m trying to plot a paramatric curve in the u direction and in the v direction.
As @Robert_Younger has pointed out, this is exactly the issue. Point.ByCoordinates has three inputs, all of which require a coordinate value (a number), but you’ve provided lists of Lines. You’re not providing the correct inputs. The warning from that node should also point this out. We don’t know what numbers you’re wanting to use for these inputs, so you’ll have to make some effort to either determine those appropriate values in your graph or explain specifically what you need.
I need to draw a parameterization curve in the u direction and in the v direction. now with your explanations, I don’t know in which nodes I should input my numbers.
The problem is you don’t have numbers. You have lines. What numbers do you want to use to create points for the nurbs curve? You already had points and used them to create lines. Are those the points that you want for the curve?
I would like to use numers like 3;6 and 9. I want to have a graph, whether with dots or lines, but I would prefer to have lines.
But you need actual points to develop a curve. Where do 3, 6, and 9 come from? That gets you one point - not enough for a line let alone a parametric curve. You need a set of points defining the curve and you need x, y, and z coordinates for each of those points.
It seems like you may have already done this by creating the lines, but then it would be redundant to have lines representing the parametric curve and a nurbs curve representing the same thing. Either way, the points defining the segmented lines would presumably be the same points defining the nurbs curve.
It might be helpful if you shared your dyn and took the time to explain what it’s doing and how you want this parametric curve defined.
Homéomorphe (1).dyn (85.2 KB)
Please try a little harder to provide some context and information. The graph you shared is very different from the one in your original post. It has completely different warnings that you haven’t addressed. What is the issue with the graph in your original post? What is the issue with the one you’ve shared? What have you done as an attempt to fix them? We can’t help you solve your problems if we don’t understand what they are to begin with.
If you want a nurbs curve drawn via control points then you need to provide a list of control points. If you’ve already created lines between those control points then you just need to reuse that same list of points. If you need something else, then you need to explain what you have and what you want.
