Let's begin with that little guy sitting at the top of the page.
The latest "thing" is 3D! At first it seems a little silly, since there is sparse 3D content available to deliver. But here is where change occurs. Google 3D freeware and you will see page after page of free software that will allow creation of 3D Content for learning. I particularly like Blender, but it is a little complicated for some users. 3D Crafter from https://amabilis.com/ is a great freeware program to learn 3D, with upgrades to professional versions for the advanced user. Did I mention animation? It's easy with 3D Crafter. Look at the upgrades link on the amabilis home page to see the features available. They really are impressive. One of the main reasons that I suggest this is because of it's compatibility with other well known expensive 3D software programs. The licensed versions are also quite inexpensive at $35 for the plus version or $70 for the pro version. I strongly encourage you to look at this freeware program.
Since we are discussing anaglyph (color) 3D, you might want to visit https://www.studio3d.com and order some 3D glasses. Then you can see the vast 3D collections on this site, Youtube, and elsewhere (that means everywhere).
Robby, here on the left, was created using RoboWorks, a relatively expensive 3D program for creating 3D Perspective images. 3D Perspective images may be rotated or manipulated by the program, but are captured and displayed on 2D medium, such as paper or a standard 2D monitor. Using freeware such as 3D Crafter could provide the same results with lots of practice.
This type of 3D provides additional information to the trainee about the item being demonstrated. Rotating the image provides an additional dimension that the trainee can view. The option is using 2D line drawings that can often be difficult to understand without additional training.
There are different meanings for 3D. Besides 3D Perspective, there is true Stereographic 3D.
Stereographic 3D - Using two images to provide the depth information to the brain. Remember the 3D Red and Cyan colored glasses? There baaack.... Also more modern 3D displays that use different methods to show two images at once.
With stereographic 3D we have multiple options. Yes, we can use the colored glasses, but we can also use shutter glasses or use glasses with circular polarized lens. It all depends on the display that we intend to use in our training program.
Anaglyphs - Two images with different colors viewed through glasses that have the appropriate colored lens. Each eye sees predominantly the color of the lens over that eye. The anaglyph image at the top of the page can be viewed using Red & Cyan colored lens.
Interleaved - The image is displayed as alternating L-R circularly polarized lines, thus providing a different image to each eye when using polarized 3D glasses. This is often called RealD or Theater3D. The large image to the lower left could be viewed directly on a ViewSonic V3D231 monitor using theater style polarized glasses, or on a 55 inch Visio 3D television using Theater3D glasses. The key is to show the image in the same number of lines that it was captured. Scaling the image will destroy the 3D effect. If viewing this on a polarized monitor, try moving the page with the vertical slider. Watch as the image is behind the page of pops out of the page, determined by the location on the screen.Moving the image one line up or down causes the effect by reversing the left - right eye images
Shutter Glasses - Glasses that rapidly show one image to one eye, and another image to the other eye. Typically operating at 120 Hz on a specialized monitor with high end video drivers. Expensive glasses and hardware, but great results.
The anaglyph at the top of this page was created by shifting the left image of the pair slightly to the right, and the right image slightly to the left. Then use the freeware program Anaglyph Maker from https://www.stereoeye.jp/index_e.html. Shifting the images in opposite directions makes the image stand out from the page. Shifting the images in the other direction, left for left and right for right, makes the image appear behind the screen, as seen through a window.
Important Note: You can also use Anaglyph Maker to display an image pair as any type of Stereographic image to match the display that you are using. Just choose the two images and the type of display that you would like to see, anaglyph R-C R-B or R-G, interleaved, or shutter, and make the image on the screen. Using Anaglyyph maker lets you scale your image without losing the 3D effec when using polarized displays.
Image pair to create anaglyph
Alternate R-L circular polarized lines, Interleaved Image