Rise of the Triad

Rise of the Triad is a 1995 FPS game developed by 3D Realms, then known as Apogee. It is notable due to the close relationship between the development team and id Software.

Development
The creative director of Rise of the Triad was Tom Hall, and the game was his first project after Doom. He had been fired from id Software by John Carmack in early August 1993 due to differences in design. He immediately started working on Rise of the Triad, and had written the original design document by November the same year.

The game was initially meant to be an official sequel to Wolfenstein 3D, appropriately called "Rise of the Triad: Wolfenstein 3D Part II". Apogee had licensed the Wolfenstein engine for the game, but the development team added many features to the game, among others fog, dynamic lighting simulation, room-over-room, jumping, gibbing, skyboxes and so on. The major drawback of using the Wolfenstein engine was the lack of a z axis, a technical limitation that resulted in maps with no height differences, and a strict 90º angle architecture.

Relationship to Doom
The lead designer and creative director was Tom Hall, and he brought a lot of design elements and ideas with him from id Software. Having been the lead designer for what was intended to be the retro-prequel; Wolfenstein 3D; he originally planned to migrate many of the features he designed into Wolfenstein, such as pushwalls to obtain secrets and bonus point items.

The continuous world design feature Hall argued for inclusion in Doom was originally meant to be included in Rise of the Triad. Hall also included the characters from his Doom Bible as playable characters in the game.

Change in design
When Doom was nearing completion John Carmack revoked the license and changed the licensing terms to the extent Apogee could not market the game as a Wolfenstein sequel, purportedly to lessen the impact Rise of the Triad would have on Doom sales. The development team thus had to scrap most of the work done to that point and redesign the game as a stand-alone shooter.