Only some formulas require serious hardware resources and a long time for rendering, which contain many iterations and in situations with complex lighting, reflections and shadows, at high resolutions.
Get about 12" away from the image, centered on the vertical dividing line. Slowly cross your eyes while keeping the left and right panes level ... at a certain point your focus will lock onto the "middle" pane and it will look like 3D. Takes practice to get it consistently.
A "middle, third image" will appear with your eyes crossed. It will be slightly smaller than the two originals. The middle image will appear to float on a plane in front of the two originals. It will be sharp and amazingly "three dimensional" in appearance. The originals will be "out of focus."
A lot of people get headaches when they first try this technique. The "trick" is to let your eyes relax in the crossed position.
These are very small images. I learned the technique reading 3-D x ray films. An x ray image is as large as the part of the body being examined. Generating such a large "3-D" image is very impressive and immersive.