There are still many people out there with retro computers with these cards available. I am one of them, and I love playing the games that are tailormade to each card. I did some digging and I now doubt Silent Thunder and Cybergladiators were Rendition Ready games (meaning they ran on Renditions own API). Cybergladiators is Glide and Direct3D compatible and from what I can find from old Google group discussions the version that came with the Sierra card also ran on Direct3D (which the card was able to run). This is probably attributed to the fact that both these games are Windows games and the Windows API for Rendition, RRedline wasn't released untill 1997.
Silent Thunder also looks to be Direct3D, but this version is not possible to find anywhere unless you have the bundled version. From bjorn3d archived page
I found this:
Q Is A10-Silent Thunder rendition ready?
A: The version of A10 that comes with the Screamin' 3D is Direct3D. Unfortunately none of us can get our hands on it because it is bundle only. /Mike
I also found this list published by Microsoft with games that will have Direct3D support. Silent Thunder is mentioned:http://www.microsoft.com/en-us/news/pre ... gmspr.aspx
Both games were also planned to be released on the Voodoo, but only Cybergladiators made it. If they had plans for Silent Thunder as well, making it Direct3D would make sense.http://findarticles.com/p/articles/mi_m ... _18835454/
If Silent Thunder really is Direct3D (which I am now pretty convinced of) this makes it much more interesting in making a patch. The game would then be able to run on modern graphic cards as well.