How to draw a doughnut 9
tikz
samcarter samcarter
19 With the following code, you can create your own doughnut just as you like it.
samcarter
7 Here is a doughnut for mathematicians and physicists, who have the strange habit of calling a doughnut a torus. It requires the [3dtools library](https://github.com/marmotghost/tikz-3dtools), which contains functions for some critical angles. This means that you can adjust the view and draw cycles that wrap around tori.
marmot
Is this code true about a cube is insribed a cylinder? 8
tikz
Anonymous 1123 Anonymous 1123
5 As mentioned in the comments, the code does use `\tdplotmainphi`. However, this is actually not necessary. This answer comes with a pic that draws a cyclinder with an arbitrary axis. It also can be rotated by using rotated coordinates. It does not use `\tdplotmainphi` or `\tdplotmaintheta`. It does not rely on the specific way you installed your 3d view. The same statement applies to the polyhedron. So in order to know whether or not a code is correct it is generally not suffcient to check whether it uses certain macros.
marmot
How to draw a rectangular parallelepiped is inscribed in a right circular cone by another way? 1
tikz
Anonymous 1123 Anonymous 1123
6 This code recycles the `cone` pic from another answer. In order to decide whether the edges from a point `A`, `B`, `C`, or `D` to `S` are visible or hidden, we compute the normal on the cone at these points. The normal is given by the vector product of the tangent at the base circle and the respective edge. The tangent is simply given by the vector product of the point and `(0,0,1)`.
marmot
How to draw rectangular parallelepiped inside a pyramid? 13
tikz
Anonymous 1123 Anonymous 1123
7 Ususally it is rather hard to check whether a line gets blocked by another object. In this case one can make things work with some reversed clips. This should give you the correct picture as long as you do not change the view angle `theta` too much.
marmot
How to get a solid when rotate a convex polygon around a line? 9
tikz
Anonymous 1123 Anonymous 1123
9 Here is some proof of principle for triangles. It computes the envelope of the rotation of a triangle around one of its edges. The critical angles are the same as [here](https://topanswers.xyz/tex?q=1218#a1447), only for a constant slope. I am not convinced that Ti*k*Z is made for such tasks, let alone for generalizations to arbitrary polygons. These codes require the newest version of [3dtools](https://github.com/marmotghost/tikz-3dtools) because I decided to add (a user interface to) the components of the normal to the library as they are getting used in various applications.
marmot
Draw circumcircle knowing length of three edgs of a triangle without using Mathematica. 20
tikz
Anonymous 1123 Anonymous 1123
12 I had some code for the circumcicle center on my computer, it is likely that it is from an answer and parts of the code come from the corresponding question. Yet I did not really find them. Anyway, here it is.
marmot
How to make this symbol in TikZ? 28
tikz
Anonymous 1123 Anonymous 1123
11 A similar symbol is available as `\backsim` in amssymb:
samcarter
10 Here is something that provides you with a somewhat shorter Ti*k*Z code. The code in the answer is longer because the resulting symbol respects the font size.
marmot
How to draw dashed lines this figure automatically? 46
tikz
Anonymous 1123 Anonymous 1123
5 This is a convex shape, so we can repeat the tricks from the previous answer on tetrahedra. Note that I added the style for the face to the `3dtools` library, so you need to load it to run the following code. Note that the default value of `O` happens to be inside the poyhedron here, in general you may to adjust it.
marmot
How to draw and make animate solid when I rotate this figure around the line `CD` 11
tikz
Anonymous 1123 Anonymous 1123
8 This question is conceptually almost the same as your previous [question on the tetrahedron](https://topanswers.xyz/tex?q=1349), so we can recycle a lot of things from there. Basically you can use routines like `draw face with corners` for an arbitrary polyhedron as long as it is sufficiently convex. In the case at hand, there is however one plane which needs to be treated separately. Please note that if you have updated your pgf installation to 3.1.6, you need to get the [newest version of `3dtools`](https://github.com/marmotghost/tikz-3dtools).
marmot
How to add and remove edges from a graph 15
beamer tikz
topnush topnush
5 You could specify the overlays as third variable in your for-loop:
samcarter
5 Here is a proposal. You can add and remove elements from the list of edges with the pgf keys `add edges` and `remove edges`, respectively. Since you are saying that you want to draw the result each time, this is built into these keys. Adding and removing is achieved by steering the visibility via `overlay-beamer-styles`.
marmot
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