user11681: I'd like to know how to produce this kind of instructional video, where an actor is writing on an invisible wall facing the camera:



Introduction to Limits (mathbff)
What equipment/tools and which setup is required to shoot this video?

user3592: You need a few simple things to do this:

a camera
a large piece of glass or plexiglass
dry erase markers
editing software capable of basic transform controls

Record your actor writing on the glass.  To the camera, the writing will appear backwards.  Use your editing software to flip the image horizontally.  The writing will now appear normal*.  Most editing software is capable of this operation.  If there's not a "flip horizontal" command, try setting the horizontal scale to -100%.
*Pro tip:  Make sure your actor's clothes don't have any writing on them, or it will appear backwards in the final result.

11681: <p>I'd like to know how to produce this kind of instructional video, where an actor is writing on an invisible wall facing the camera:</p>

<p><div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/jlLlxgwCt6o?start=0"></iframe>
            </div></div></p>

<p><em>Introduction to Limits (mathbff)</em></p>

<p>What equipment/tools and which setup is required to shoot this video?</p>
 3592: <p>You need a few simple things to do this:</p>

<ol>
<li>a camera</li>
<li>a large piece of glass or plexiglass</li>
<li>dry erase markers</li>
<li>editing software capable of basic transform controls</li>
</ol>

<p>Record your actor writing on the glass.  To the camera, the writing will appear backwards.  Use your editing software to flip the image horizontally.  The writing will now appear normal*.  Most editing software is capable of this operation.  If there's not a "flip horizontal" command, try setting the horizontal scale to -100%.</p>

<p>*Pro tip:  Make sure your actor's clothes don't have any writing on them, or it will appear backwards in the final result.</p>
