Corncob 3D is a 1992 DOS game by Pie in the Sky Software and published by MVP Software.
The source was originally released in 2001: https://web.archive.org/web/20020108042105/http://psky.com/prog/downloads.htm but then lost, as internet archive didn't get it and the site went down shortly after.
It was republished by @Jason_TAC on twitter on 2018-04-11: https://twitter.com/dosnostalgic/status/984236075945222146 (with help from @dosnostalgic)
This code has no official licensed attached, but the original developer said "do whatever you like with it" (See https://twitter.com/TideGear/status/984514063387344896)
It can be compiled with MASM 6.0b after I've made minor changes. It needs Spontaneous Assembly libraries, I believe. I'm currently waiting on those to arrive from eBay.