This is a new 3D printing method that uses something like Computer Tomography to produce 3D objects in a transparent container of resin. The container rotates and a single light source (a DLP projector) solidifies the resin as it rotates, conceptually forming a 3D object all at once instead of incrementally as other 3D printing methods do.
Here is half decent YouTube video about it. Here is the wiki article, and it links to several other articles which say pretty much the same thing as in the video.
The video explains that this grew out of experimental use of multiple light sources to solidify a 3D shape inside a container of resin. In that mode the resin would be solidified where 3 sources of light intersected with enough intensity to solidify the resion. It’s easy to see how resin would solidify from the intensity of multiple intersecting light sources. But in the new process there is only one light source and the container rotates.
So how does one light source solidify the resin? The video starts to talk about this around 2:20 but I’m not picking up how a bit of resin in the middle of a container solidifies. If it’s just the high level of intensity of the light the resin should solidify just inside the container wall when the light hits it. Is there some very specific light intensity that will solidify the resin and a higher intensity light has to pass through some of the resin which absorbs some of the light before it reaches the specific point of intensity where the resin solidifies?
I hope I’m asking the question right, basically in this scheme I don’t understand how a single light source can solidify resin in the middle of a container. The video and the linked articles all seem to gloss over this, or else I’m just not getting the explanation.