Using nodes in tikz package hobby

Question

I am using the package hobby for the first time, and it seems to me that using named nodes instead of coordinates is not supported. In particular, why do the following MWEs produce two different pictures ?
documentclass[tikz,border=10pt]{standalone}
usepackage{tikz}
usetikzlibrary{hobby}

begin{document}

begin{tikzpicture}
draw[help lines] (0,0) grid[step=0.25] (1,1);
draw
(0,0) to [curve through={
(0.15,0.35) .. 
(0.5,0.5)   .. 
(0.8,0.6) } ]  
(1,1);
end{tikzpicture}

begin{tikzpicture}

node (n1) at (0,0) {};
node (n2) at (0.15,0.35){};
node (n3) at (0.5,0.5){};
node (n4) at (0.8,0.6){};
node (n5) at (1,1){};

draw[help lines] (0,0) grid[step=0.25] (1,1);
draw
(n1) to [curve through={
(n2) .. 
(n3)   .. 
(n4) } ]  
(n5);
end{tikzpicture}
end{document}

Zarko · Accepted Answer

nodes are not coordinates! they have non zero size, so the lines between them is discontinued. as work around you have two possibilities:

for named coordinates use for example

draw
(n1.center) to [curve through={
(n2.center) ..
(n3.center)   ..
(n4.center) } ]
(n5.center);

or define named coordinates as

coordinate (n1) at (0,0); 
coordinate (n2) at (0.15,0.35); 
coordinate (n3) at (0.5,0.5); 
coordinate (n4) at (0.8,0.6); 
coordinate (n5) at (1,1);

in both cases you will get the same result:

Using nodes in tikz package hobby

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