How to generate fog effect with AI video models? | AI VFX

AI Fog Effect Video Prompt: Create a high-resolution, locked-down loop video on a pure black background featuring realistic steam burst. The source of the steam is at the lower center. The steam is blown from the source rapidly like hot spring. The spring stays low, close to the surface.

Try this prompt in RunComfy AI Video Generator Playground →.

Recently we experimented on how to generate a realistic fog effect with AI models.

VFX Generation Prompt for Fog Effect

A good VFX generation prompt should consist of the following

Subject
Subject Movement
Camera Movement
Environment
Lighting/Aesthetic

But what is a good fog effect VFX generation prompt?

Feature	Prompt following ability (⭐ worst, ⭐⭐⭐⭐ best)	Examples
density	⭐⭐⭐⭐	sparse, thin, exceptionally sparse, semi-transparent, varying densities
texture	⭐⭐⭐⭐	wispy, delicate tendrils, gossamer-thin, swirling, billowing, dry ice fog, mist, cloud
movement direction	⭐⭐⭐	left to right, right to left, upward, outward from background to foreground, inward from foreground to background, diagonal, toward the upper left of the frame
movement speed	⭐	slow-motion, unhurriedly, steady, gentle
source	⭐⭐⭐⭐	from lower portion of frame, from center point, from bottom, from background, from the lower right corner
movement style	⭐⭐⭐	twisting and curling, bubbling, rolling waves, drifting, dispersing, flowing, swirling

Fog effect videos and their prompts

You will notice there are colored texts in the prompt, Red means generation will follow this section nicely. Yellow means it might or might not follow the prompt section. Green means it doesn’t have any impact on the final generation.

Ground Emission Atmosphere Towards Cam

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Toward the viewer/ camera/ screen not working, density and texture work

AI Fog Effect Video Prompt: A thin stream of white smoke is gently blown into a dark space, moving in a smooth, slow-motion flow. The smoke twists and curls as it expands, forming delicate, swirling patterns. The soft wisps gradually disperse into the air, creating an ethereal, dreamlike effect against the pitch-black background. The lighting subtly highlights the intricate details of the vapor, emphasizing its graceful movement.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: A black background with a sparse, semi-transparent fog blowing toward the camera from the lower portion of the screen. The fog is light, drifting gently, and appears to dissipate slightly as it moves forward. Its movements are slow and ethereal, with the fog's density fluctuating as it progresses, creating a soft and mysterious atmosphere.

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AI Fog Effect Video Prompt: In a pure black void, delicate wisps of smoke drift gracefully toward the viewer. The smoke is exceptionally sparse and ethereal, floating with a dreamy slowness that creates an almost hypnotic effect. Each tendril of smoke is remarkably thin and translucent, barely visible against the darkness, yet distinct enough to create depth. The smoke emerges from the lower portion of the frame, steadily advancing forward with subtle, gentle turbulence. As it moves, it maintains its wispy nature, never becoming too dense or overwhelming. The static camera captures this ethereal dance as the smoke particles spread out while approaching, creating an intimate connection with the viewer. The smoke's pure white color contrasts beautifully against the pitch-black background, with its movement remaining consistently gentle and measured throughout.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: In a pure black void, delicate wisps of smoke drift gracefully along the positive z-axis, moving directly toward the viewer. The smoke is exceptionally sparse and ethereal, floating with a dreamy slowness that creates an almost hypnotic effect. Each tendril of smoke is remarkably thin and translucent, barely visible against the darkness, yet distinct enough to create depth. The smoke emerges from the lower portion of the frame, advancing steadily forward with subtle, gentle turbulence. As it moves, it maintains its wispy nature, never becoming too dense or overwhelming. The static camera captures this ethereal dance as the smoke particles spread out while approaching, creating an intimate connection with the viewer. The smoke's pure white color contrasts beautifully against the pitch-black background, with its movement remaining consistently gentle and measured throughout.

Try this prompt in RunComfy AI Video Generator Playground →.

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Flow outward from the background works

AI Fog Effect Video Prompt: In a pure black void, ethereal dry ice fog expands from far to near. The fog remains low to the ground, creating a mesmerizing ground-hugging effect. Each wisp is exceptionally sparse and translucent, with delicate tendrils that barely rise above the lower third of the frame. The dry ice vapor emerges gently from the depth of the scene, advancing through space while maintaining its gossamer-thin appearance. The static camera captures the subtle swirls as the cool fog spreads outward, never rising too high or becoming too dense. The pure white vapor provides a striking contrast against the pitch-black background, its movement peaceful and measured.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: In a pure black void, ethereal dry ice fog flows from distant plane to close plane. The fog remains low to the ground, creating a mesmerizing ground-hugging effect. Each wisp is exceptionally sparse and translucent, with delicate tendrils that barely rise above the lower third of the frame. The dry ice vapor emerges gently from the depth of the scene, advancing through space while maintaining its gossamer-thin appearance. The static camera captures the subtle swirls as the cool fog spreads outward, never rising too high or becoming too dense. The pure white vapor provides a striking contrast against the pitch-black background, its movement peaceful and measured.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: In a pure black void, ethereal dry ice fog emanates from the center point of the frame, blooming outward in a graceful expansion. The fog immediately begins to sink downward, creating an elegant cascading effect that fills the lower portion of the frame. Each wisp is exceptionally sparse and translucent, with the vapor simultaneously spreading horizontally and descending, like a gentle waterfall of mist. The fog maintains its gossamer-thin appearance as it unfolds and settles, never rising above its origin point. The static camera captures the delicate balance between the outward expansion and downward flow, as the cool vapor creates intricate, low-lying patterns. The pure white fog provides a striking contrast against the pitch-black background, its movement both expansive and gravitational.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: In a pure black void, ethereal dry ice fog flows outward from the background to the foreground. The fog, appearing as thin dispersing streams, creates a mesmerizing ground-hugging effect. Each wisp drifts gently as a delicate, scattered tendril, maintaining generous spaces between each misty strand. The dry ice vapor emerges softly from the depth of the scene, its gossamer-thin streams advancing through space while gradually dispersing. The static camera captures the subtle swirls as the cool fog spreads outward, the scattered tendrils occasionally lifting in graceful wisps. The pure white vapor, sparse and ethereal, provides a striking contrast against the pitch-black background, its movement peaceful and measured.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: No ground, no any other thing except the fog. In a pure black void, ethereal dry ice fog flows outward from the background to the foreground. The fog, appearing as thin dispersing streams. Each wisp drifts gently as a delicate, scattered tendril, maintaining generous spaces between each misty strand. The dry ice vapor emerges softly from the depth of the scene, its gossamer-thin streams advancing through space while gradually dispersing. The static camera captures the subtle swirls as the cool fog spreads outward, the scattered tendrils occasionally lifting in graceful wisps. The pure white vapor, sparse and ethereal, provides a striking contrast against the pitch-black background, its movement peaceful and measured.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: In a pure black void, ethereal dry ice fog flows outward from the background to the foreground. The fog remains low to the ground, creating a mesmerizing ground-hugging effect. Each wisp is exceptionally sparse and translucent, with delicate tendrils that barely rise above the lower third of the frame. The dry ice vapor emerges gently from the depth of the scene, advancing through space while maintaining its gossamer-thin appearance. The static camera captures the subtle swirls as the cool fog spreads outward, never rising too high or becoming too dense. The pure white vapor provides a striking contrast against the pitch-black background, its movement peaceful and measured.

Try this prompt in RunComfy AI Video Generator Playground →.

Ground Emission Atmosphere Away From Cam

AI Fog Effect Video Prompt: In a pure black void, ethereal dry ice fog flows from the close plane to the distant plane. The fog remains low to the ground, creating a mesmerizing ground-hugging effect. Delicate wisps drift as separate, barely-there tendrils, each one exceptionally sparse and translucent, with gossamer-thin strands leaving generous spaces between them. The dry ice vapor first emerges in the foreground, its scattered wisps gradually retreating into the depth of the scene while maintaining their thread-like appearance, followed by a second wave of fragmented tendrils that appear and drift backward. The static camera captures the subtle swirls as the dispersed fog flows inward, the separated streams never rising too high or merging together. The pure white vapor provides a striking contrast against the pitch-black background, its layered movement peaceful and measured.

Try this prompt in RunComfy AI Video Generator Playground →.

Looping Smokey Atmosphere

AI Fog Effect Video Prompt: In a pure black void, ethereal mist fills the entire frame, its gentle movement flowing steadily from left to right. The vapor appears as a soft, expansive presence, drifting in broad, subtle waves that travel horizontally across the scene. Each wave of mist maintains a delicate, translucent quality as it flows, creating layers of gentle movement across the frame. The static camera captures the peaceful lateral drift as the vapor continues its perpetual journey rightward. The pure white mist provides a subtle contrast against the pitch-black background, its motion constant and serene. The scene exists purely as mist moving through the infinite void.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: In a pure black void, ethereal mist fills the entire frame, its gentle movement flowing unhurriedly from right to left. The vapor appears with varying intensities, the denser areas gradually dissipating into delicate, wispy tendrils as they drift horizontally across the scene. Each graceful wave of mist unveils a subtle interplay between thick and thin areas, creating depth through layers that slowly unfold. The static camera captures this peaceful lateral movement as the vapor continues its slow, meditative journey leftward. The pure white mist provides a subtle contrast against the pitch-black background, its dreamy motion deliberately gentle, like clouds lazily drifting on a windless day. The scene exists purely as mist moving through the infinite void, its pace unhurried and tranquil.

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AI Fog Effect Video Prompt: In a pure black void, ethereal clouds fill the entire frame, their gentle movement flowing unhurriedly from right to left. The clouds appear with varying densities, like morning mist banks gradually unfurling, some areas softly billowing while others remain delicately translucent as they drift horizontally across the scene. Each graceful formation reveals a subtle interplay between substantial and gossamer-thin layers, creating depth through cloud patterns that slowly evolve. The static camera captures this peaceful lateral movement as the cloud banks continue their slow, meditative journey leftward. The pure white clouds provide a subtle contrast against the pitch-black background, their dreamy motion deliberately gentle, like dawn clouds drifting across still skies. The scene exists purely as clouds floating through the infinite void, their pace unhurried and serene.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: In a pure black void, rolling fog blankets the scene, its gentle movement flowing unhurriedly from right to left. Like a living cloud cover, it stretches and flows, creating layers of varying opacity as it drifts. The static camera captures this peaceful lateral movement as the cloud formations continue their slow, meditative journey leftward. The pure white clouds provide a subtle contrast against the pitch-black background, their dreamy motion deliberately gentle and continuous.

Try this prompt in RunComfy AI Video Generator Playground →.

Mist Bubbling up

AI Fog Effect Video Prompt: In a pure black void, ethereal mist gently bubbles upward from the bottom of the frame. The vapor emerges in soft, rolling waves, each billow unfurling like a delicate cloud as it rises. The fog forms rounded, cushion-like shapes that swell and bloom upward with graceful buoyancy, never rising beyond the lower third of the frame. Each wave of mist maintains its fluid, bulbous form as it expands, creating an undulating layer of gentle movement. The static camera captures the peaceful upward drift as new bubbles of vapor continuously form and merge. The pure white mist provides a striking contrast against the pitch-black background, its motion tranquil and mesmerizing. The scene exists purely as mist flowing through the infinite void.

Try this prompt in RunComfy AI Video Generator Playground →.

Mist Spray

AI Fog Effect Video Prompt: In a pure black void, ethereal mist sprays diagonally upward from the lower right corner, its delicate stream flowing toward the upper left of the frame. Like a gentle fountain of vapor, the translucent wisps emerge in a focused stream before gradually dispersing into gossamer-thin tendrils. Each graceful plume maintains its wispy nature as it travels, creating an elegant diagonal trajectory. The static camera captures the peaceful flow as the fine mist continues its gentle ascent, spreading and thinning as it reaches higher. The pure white vapor provides a subtle contrast against the pitch-black background, its movement smooth and continuous while maintaining its delicate, airy quality.

Try this prompt in RunComfy AI Video Generator Playground →.

Dust Storm at Camera

AI Fog Effect Video Prompt: A dramatic dust storm effect against a pure black background, intense white dust clouds billowing up from the ground. The dust storm appears as dense, turbulent clouds with complex volumetric shapes, showing strong upward movement. Multiple layers of rolling clouds create a thick, dynamic wall of dust. Professional VFX quality, particle simulation, high detail in cloud formations, transparent background, volumetric lighting, 8K resolution, photorealistic rendering.

Try this prompt in RunComfy AI Video Generator Playground →.

Some Really Nice AI Fog Effect Videos

AI Fog Effect Video Prompt: Generate a high-resolution, locked-down video on a pure black background showing light mist slowly spreading from a surface, gently rising and expanding outward. The mist should be delicate and airy, starting from the bottom and spreading evenly in all directions, with some natural subtle upward drift. The movement should be very slow and gentle, giving the impression of a soft and quiet expansion of mist that gradually dissipates over time, with slight contraction and expansion in a natural rhythm.

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AI Fog Effect Video Prompt: Create a high-resolution, locked-down video on a pure black background showing a dense smoke screen hit. The smoke should expand rapidly outward from a central point, creating a thick, erratic cloud that moves unpredictably. The motion should be dynamic, with the smoke quickly spreading outward in bursts. The scene should evoke a dust storm, with the smoke dispersing in irregular patterns, fading and expanding as it fills the space.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: Create a high-resolution, locked-down video on a pure black background featuring slow and realistic fog spreading. The fog begins at the bottom of the frame, with soft swirling tendrils expanding outward. As the fog slowly spreads, it should naturally dissipate and shift, with subtle variations in density and motion, simulating real-life atmospheric movement. No visible ground or additional elements.

AI Fog Effect Video Prompt: Create a high-resolution, locked-down loop video on a pure black background featuring slow and realistic fog spreading. The light fog begins at the bottom of the frame, with soft swirling tendrils expanding outward. The video should be looping seamlessly.

Try this prompt in RunComfy AI Video Generator Playground →.

AI Fog Effect Video Prompt: Create a high-resolution, locked-down loop video on a pure black background featuring realistic steam burst. The source of the steam is at the upper right corner. The steam is blown from the source rapidly with high pressure

Try this prompt in RunComfy AI Video Generator Playground →.