General 3D motion

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% Author: Izaak Neutelings (June 2017)
% taken from https://tex.stackexchange.com/questions/159445/draw-in-cylindrical-and-spherical-coordinates
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{tikz}
\usepackage{tikz-3dplot}
\usepackage[outline]{contour} % glow around text
\usepackage{xcolor}
\colorlet{veccol}{green!50!black}
\colorlet{projcol}{blue!70!black}
\colorlet{myblue}{blue!70!black}
\colorlet{xcol}{blue!85!black}
\tikzset{>=latex} % for LaTeX arrow head
\tikzstyle{proj}=[projcol!80,line width=0.08] %very thin
\tikzstyle{area}=[draw=veccol,fill=veccol!80,fill opacity=0.6]
\tikzstyle{vector}=[->,veccol,thick]
\usetikzlibrary{angles,quotes} % for pic (angle labels)
\contourlength{1.3pt}
\begin{document}
% 3D AXIS with spherical coordinates
\tdplotsetmaincoords{60}{105}
\begin{tikzpicture}[scale=2.0,tdplot_main_coords]
  
  % VARIABLES
  \def\l{0.3}
  \def\rvec{1.2}
  \def\thetavec{46}
  \def\phivec{50}
  
  % AXES
  \coordinate (O) at (0,0,0);
  \coordinate (A) at (0.2,-0.1,0.9);
  \coordinate (P1) at (0.3,0.2,0.85);
  \coordinate (P2) at (0.8,1.0,0.6);
  \coordinate (B) at (0.9,1.2,0.3);
 
 
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