[Tex/LaTex] 3D Images / Stereoscopy in Beamer

3dbeamer

Is it possible to create "real" 3D effects within a Beamer presentation using Stereoscopy (for 3D monitors)?

What I mean by that is:

Duplicate the slides left and right (for both eyes)
Animations so that certain parts of the slide pop out of the screen, i.e. different translation in the left and right view
Support for stereoscopic images, or even videos (with the multimedia or movie package).
An example for a stereoscopic image:

Is there a package that allows creating these kinds of effects? Or a workaround with the normal Beamer package? Thanks.

Best Answer

Here are two options, none of them using a special package:

Just include the original image (\includegraphics{...}), and look at it in a cross-eyed fashion. This might be a bit painful, thus do it at your own risk. However, special prismatic goggles are available in order to avoid cross-eying.

Produce an ↗anaglyph from the two halves of the original, embed it into the document (\includegraphics{...}) and use cheap red-cyan goggles to look at it. These are the steps for creating such an anaglyph using ↗ImageMagick command line tool magick:

2.1. Get the original size:

$ magick identify 92vc6.jpg
92vc6.jpg JPEG 3232x1080 3232x1080+0+0 8-bit sRGB 232083B 0.000u 0:00.000

2.2. Save the left half (for the right eye) and the right half (for the left eye) into separate files:

$ magick convert -crop 1616x1080+0+0 92vc6.jpg shark-right.png
$ magick convert -crop 1616x1080+1616+0 92vc6.jpg shark-left.png

2.3. Produce the anaglyph by compositing the red channel of shark-left.png and the green and blue channels of shark-right.png into one image file shark-ana.png:

$ magick composite -stereo +0 shark-right.png shark-left.png shark-ana.png

If you have a sequence of anaglyphs (set of PNG or JPEG, or animated gif) making up an animation, you could embed this sequence using the animate package. The same applies to animated pairs of stereo images (like the above) where you may want to use prismatic goggles (or cross-eying).

shark-ana.png:

Related Solutions

[Tex/LaTex] How to include, in beamer handout, a slide exactly as it appears in presentation mode on a particular transition

A workaround on your problem is to temporarily change from handout to beamer mode while compiling. This way you can select a subset of slides, exactly as they are compiled in presentation mode. The trick is to change the internal variable \beamer@currentmode that Beamer uses (I don't know if messing with this can break any thing). I created a new environment to encapsulate this change for my slides, so I hope it can be useful.

What you have to do is:

copy the definitions to the preamble
put your frame in a \begin{handoutframeselect}[2,4-5], changing the specification to whatever you need
put a selection macro in front of your frame: \begin{frame}<\slideselection>

The macro \slideselection will select the whole set of slides when in presentation mode, but only you specification when in handout mode. Check the example:

\documentclass[handout]{beamer}
\usepackage[utf8]{inputenc}
\usepackage{default}
\usepackage{tikz}

\makeatletter
\newif\ifOnBeamerModeTransition
\newcommand{\slideselection}{1-}%
\newenvironment{handoutframeselect}[1][1-]{%
  \begingroup%
  \mode<handout>{%
    \gdef\beamer@currentmode{beamer}%
    \OnBeamerModeTransitiontrue%
    \renewcommand{\slideselection}{#1}}%
}{%
  \ifOnBeamerModeTransition%
    \OnBeamerModeTransitionfalse%
    \gdef\beamer@currentmode{handout}%
  \fi%
  \endgroup%
}
\makeatother

\begin{document}

\begin{frame}{Normal frame}
No selection in this frame:
\begin{itemize}[<+->]
  \item slide 1
  \item slide 2
  \item slide 3
\end{itemize}
\end{frame}

\begin{handoutframeselect}[2,4-5]
\begin{frame}<\slideselection>{Custom frame}
slideselection will be
\begin{itemize}
\item 1- in beamer mode
\item 2,4-5 in handout mode
\end{itemize}

This slides will be shown : \slideselection
\begin{itemize}[<+->]
  \item custom slide 1
  \item custom slide 2
  \item custom slide 3
  \item custom slide 4
  \item custom slide 5
\end{itemize}
\end{frame}
\end{handoutframeselect}

\begin{frame}{Other normal frame}
In this frame, we return to handout mode, no selection either:
\begin{itemize}[<+->]
  \item slide 1
  \item slide 2
  \item slide 3
\end{itemize}
\end{frame}

\end{document}

[Tex/LaTex] Why does Beamer create multiple slides, each updated with the next item, in an itemize environment

You should read up on what is referred to as "overlay specification" within the beamer user guide. Here is an excerpt (taken from section 3.10 Using Overlay Specifications):

The overlay specifications are given in pointed brackets. The specification <1-> means “from slide 1 on.” [...] beamer automatically computes the number of slides needed for each frame. More generally, overlay specification are lists of numbers or number ranges where the start or ending of a range can be left open. For example -3,5-6,8- means “on all slides, except for slides 4 and 7.”

Note the different use of frame and slide. Each frame may have multiple slides associated with it. The overlay specification is designed to identify the number of slides for each frame. There are verbatim overlay specifications, like \only, \onslide and some "optional arguments" to macros like \item.

For itemize (lists in general, and other structures like frame), you can specify an incremental overlay specification <+-> that inserts the appropriate pause at possibly-sequential items, like lists. Read more about this in section 9.6.4 Incremental Specifications.

Best Answer

Related Solutions

[Tex/LaTex] How to include, in beamer handout, a slide exactly as it appears in presentation mode on a particular transition

[Tex/LaTex] Why does Beamer create multiple slides, each updated with the next item, in an itemize environment

Related Question