There are some tricks that can help make spectres more visible: their shimmering outline is much easier to see with the inverted colors of an invulnerability sphere, for example, and they feature a fully visible blood-splatter effect when hit. In the BREW 2.0 and 2.1 versions of Doom RPG, the highest tier of the "pinky" class of monsters, the belphegor, is rendered as a spectre rather than appearing as a blue-colored demon like it did in the J2ME builds of the game. However, this effect does not typically make the monster harder to see, but in fact makes it stand out.īelphegors become spectre variants in the BREW versions of Doom RPG. It is rendered with a bright silhouette and refractive lens-like effect which distorts the background behind it, though it lacks the static noise of the original. In Doom II for Game Boy Advance, the spectre is notably present despite its absence in its predecessor, due to using an off-the-shelf game engine purpose-built to run on the platform. Spectres also appear in the Doom 64 Cast of Characters sequence at the end of the game, unlike the spectre in the Doom II cast sequence. Upon death, they revert to an opaque state again. In Doom 64 specifically, inactive spectres are initially rendered as opaque demons with a green tint (a nod back to the nightmare spectre), becoming translucent upon detecting the player. This effect depended on a combination of analog signal processing and CRT pixel bleed to look smooth, and does not appear correct on modern hardware. 
These spectre variants are retained in the Sega Saturn port, though they are indistinguishable from regular spectres in that port as all of the varieties use the same stippled pseudo-translucency effect. The PlayStation version, aside from featuring ordinary spectres at both 25% and 100% additive translucency levels, introduced a stronger version of the spectre called the nightmare spectre which uses subtractive blending, giving it a dark green, ectoplasmic appearance. Others were selectively removed or replaced with normal demons, without any consistency or discernible pattern. This port, along with most others based on it, therefore do not truly contain a spectre monster - though spectres still occur in some of the maps, they are rendered identically to demons and are thus completely indistinguishable from them.
WIKI SPECTRE CAST CODE
EDGE, however, emulates the effect using a shader, and GZDoom allows users to select one of several "simulated" effect presets to suit their tastes.įor similar reasons, the Atari Jaguar code base omits support for the partial invisibility effect entirely. This is because the partial invisibility effect is very difficult to reproduce using such a renderer. In many OpenGL source ports, as well as in Doom 64 and the Sony PlayStation version of Doom, spectres do not "shimmer", but are instead rendered using translucency. Stippled translucency effect used to render spectres in Saturn Doom.
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