Differential Volume in Spherical Coordinates

For more figures related to the definition of coordinate systems, please have a look at the “coordinates” tag.

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\documentclass[border=3pt]{standalone}
\usepackage{tikz}  
\usepackage{tikz-3dplot} 
\begin{document}
%Axis Angles
\tdplotsetmaincoords{70}{110}
%Macros
\pgfmathsetmacro{\rvec}{6}
\pgfmathsetmacro{\thetavec}{40}
\pgfmathsetmacro{\phivec}{45}
\pgfmathsetmacro{\dphivec}{20}
\pgfmathsetmacro{\dthetavec}{20}
\pgfmathsetmacro{\drvec}{1.5}
%Layers
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background, main, foreground}
\begin{tikzpicture}[tdplot_main_coords]
%Coordinates
\coordinate (O) at (0,0,0);
%
\tdplotsetcoord{A}{\rvec}{\thetavec}{\phivec}
\tdplotsetcoord{B}{\rvec}{\thetavec + \dthetavec}{\phivec}
\tdplotsetcoord{C}{\rvec}{\thetavec + \dthetavec}{\phivec + \dphivec}
\tdplotsetcoord{D}{\rvec}{\thetavec}{\phivec + \dphivec}
%
\tdplotsetcoord{E}{\rvec + \drvec}{\thetavec}{\phivec}
\tdplotsetcoord{F}{\rvec + \drvec}{\thetavec + \dthetavec}{\phivec}
\tdplotsetcoord{F'}{\rvec + \drvec}{90}{\phivec}
\tdplotsetcoord{G}{\rvec + \drvec}{\thetavec + \dthetavec}{\phivec + \dphivec}
\tdplotsetcoord{G'}{\rvec + \drvec}{90}{\phivec + \dphivec}
\tdplotsetcoord{H}{\rvec + \drvec}{\thetavec}{\phivec + \dphivec}
 
 
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