How to Write AI VFX Prompts for Fire and Explosions
Fire and explosion prompts are among the most common requests in FXbuddy. Getting them right means specifying three things: where the fire is in frame, what it erupts from, and how big you need it. This guide shows you exactly what to include.
Generic prompts like "add fire" produce generic results. The AI video engine works best when you give it a spatial anchor (where in the frame), a physical cause (what's burning or exploding), and a mood or intensity (raging inferno vs. small campfire). The difference between a forgettable overlay and a shot that looks planned from the start is usually a single sentence of scene context.
Fire and explosion VFX in FXbuddy are fully AI-generated and match your scene's ambient lighting, so a fire added to a night exterior will cast warm light onto nearby surfaces. You don't need to manually key or composite anything.
What FXbuddy needs in a fire or explosion prompt
- Location in frame: "centre frame," "background left," "foreground right"
- Scale: small practical fire, mid-size explosion, massive detonation
- Surface or source: vehicle, building, ground, oil drum, forest floor
- Secondary elements: smoke column, debris scatter, shockwave, embers drifting
- Camera reaction: camera shake, lens flare, heat distortion in foreground
5 example prompts you can copy
Common mistakes
- No spatial anchor: "add an explosion" without a location produces a centred, generic result that rarely matches your shot composition.
- Wrong scale for the lens: Describing a "massive" explosion on a tight close-up clip confuses the AI. Match explosion scale to what the frame can realistically contain.
- Forgetting smoke: Real explosions and fires produce significant smoke. If you omit it, the AI may generate a clean-burning effect that looks artificial.
- Skipping the camera response: Mentioning camera shake or lens flare in your prompt makes the effect feel physically real rather than digitally composited.
Tips for better fire and explosion results
- Use the word "practical" when you want smaller-scale fire that looks like it was achieved on set with a real flame.
- Specify smoke density separately from flame intensity — "dense black smoke, moderate flame" gives different results than "heavy fire, light smoke."
- For explosion chains (multiple hits), generate each explosion as a separate effect and layer them on your timeline with frame offsets.
- If the AI over-generates (too much fire filling the frame), add "contained to [specific area]" to your prompt to constrain placement.
- Night shots benefit from specifying the warm orange light spill that fire casts — the AI will generate realistic light interaction with nearby surfaces.
Frequently asked questions
- How do I make an explosion look grounded in my scene?
- Tell the AI the surface the explosion erupts from, the camera distance, and whether you want debris. For example: "mid-distance car explosion, concrete surface, shockwave shakes camera, debris scattered left." The more scene context you give, the more the effect integrates with your footage.
- What is the difference between a fireball and an explosion prompt?
- A fireball prompt focuses on the rising ball of flame and smoke without specifying an impact source. An explosion prompt implies an originating impact point, shockwave, and debris. Use "fireball" when you want atmospheric fire; use "explosion" when you need a physical event with spatial context.
- Can I add fire to an existing clip rather than replacing it?
- Yes. FXbuddy generates fire and explosion VFX that composite onto your clip. The AI engine matches your scene's lighting so the effect looks integrated. Describe where in frame the fire should appear and the AI positions it accordingly.
- How many credits does a fire or explosion generation use?
- A 5-second generation uses 10 credits. A 10-second generation uses 20 credits. Starter plans include 100 credits per month; Pro plans include 750 credits per month.
- Do fire prompts work for smaller practical fire like candles or torches?
- Yes, though results vary with scale. Practical-scale fire works well when you specify the size explicitly — for example: "add a single flickering torch mounted on the left wall, warm orange glow, no smoke." Large-scale explosions and fireballs tend to produce the most consistent results.
Related prompt guides
Also see the Fire and Explosion VFX effect page for a full workflow walkthrough.
Try these prompts in your next edit
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