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Tenebrae is a GPL-ed first person shooter engine based on the Quake engine by Id Software.

It is notable for implementing stencil shadows and per-pixel lighting. The potential to use these rendering technologies in a PC gaming engine was alreay proven by their being known to be part of the game Doom 3, but the Tenebrae engine then became publicly available in late 2002 before this game was released.

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The Office of Tenebrae or Tenebræ is the name of prayer services conducted in the Catholic Church on Holy Thursday, Good Friday, and Holy Saturday, in preparation for the celebration of the Resurrection of Jesus Christ, or Easter.