{pst-eucl} package allow the drawing of Euclidean geometric figures using LaTeX macros for specifying mathematical constraints. It is thus possible to build point using common transformations or intersections. The use of coordinates is limited to points which controlled the figure.

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spherical coordinates in tikz 3d

Can we specify direction in spherical coordinates? I know we can do polar (angle:radius) but what is we are using tikz-3d and want to specify (r, theta, phi) where theta is the azimuthal angle?
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Mark 90 degree angle in tikz in german convention

What's the best way to denote a 90 degree angle with german convention like on the following picture in tikz: Suppose I start with something like this: \documentclass{article} \usepackage{tikz} ...