With the 11.3 version the combination Arrow Tube give unexpected results : the arrow head is not positionned at the end of the tube as expected from documentation :
3rd example of the basics
Code example :
Graphics3D[{Red, Arrowheads[0.1],
Arrow[Tube[{{1, 1, -1}, {2, 2, 0}, {3, 3, -1}, {4, 4, 0}}, 0.05]]}]
I see the same, Windows 10. Another example can be found in WL documentation http://reference.wolfram.com/language/ref/Tube.html?q=Tube. 3rd example under Applications.
In 11.3:
In 11.2 its OK. :
Very curious. Inserting an intermediate point along the tube shaft in certain positions makes the problem go away:
Manipulate[
Graphics3D[{Red, Arrowheads[.2],
Arrow[Tube[{{3, 3, -1}, (1 - t) {3, 3, -1} + t {4, 4, 0}, {4, 4,
0}}, 0.05]]}],
{t, 0, 1}]
Another solution is to create your own arrowhead (kinda annoying, no idea why they changed it…):
h = Graphics3D[{EdgeForm[Blue], Rotate[Cone[], 90 \[Degree], {0, 1, 0}]}];
Graphics3D[{Blue, Arrowheads[{{0.1, 1, {h, 1}}}],
Arrow[Tube[{{0, 0, 0}, {1, 1, 1}}, 0.05]]}]
The third parameter in Arrowheads[{0.1,1,{h,1}}] specifies a non-default arrowhead type and its’ location (in between 0 and 1).
The result looks like this (the arrow head is sharp again):
The line:
Rotate[Cone[], 90 \[Degree], {0, 1, 0}]}]
is needed to fix the cone orientation, otherwise it points to a wrong direction.
I guess this manual arrowhead adds more functionality but I don’t think people often use non-default arrowheads.
Another annoying thing is that when you turn on transparency you will see the tube inside the cone
h = Graphics3D[{EdgeForm[Blue],
Rotate[Cone[], 90 \[Degree], {0, 1, 0}]}];
Graphics3D[{Blue, Opacity[0.5], Arrowheads[{{0.1, 1, {h, 1}}}],
Arrow[Tube[{{0, 0, 0}, {1, 1, 1}}, 0.05]]}]
Well… I have no idea why did they change it from the previous version.
