Blender Tutorial - Rendering Fire with Transparency
Why Blender Stack Exchange recommends it
Blender Stack Exchange users link it when Mantaflow fire disappears or looks wrong in renders with a transparent background, since it supplies a working compositor node tree.
Recommended by 3 people across 3 different months, 2021 to 2025.
What it is
A short Blender tutorial from Blender Made Easy showing how to render Mantaflow fire with a transparent background. It uses a compositor node setup that masks out the fire and feeds it back in as the alpha channel.
What people said
Recommends Muhammad Wajahat · 2021-11 · Blender Stack Exchange · on “Mantaflow fire not appearing in the image saved after rendering”
Realized that because I was using transparent background, the fire was being masked out. Checking the alpha channel made me realize that fire was being masked. This tutorial helped me out: [this video]
Recommends Thrash632 · 2023-07 · Blender Stack Exchange · on “SOLVED: Alpha channel not rendering properly”
Thanks for the feedback. This helped me understand the logic behind the resulting exports. I also found a video that provides a compositing node tree that solves this problem: [this video] Just make sure to set the "Set Alpha" node to "Replace Alpha" instead of the default "Apply Mask".
Recommends Thrash632 · 2023-07 · Blender Stack Exchange · on “Compositing fire into footage with Davinci Resolve”
In case anyone is still looking for a solution, this video here has a compositing node tree that will fix this problem: [this video] Just make sure to set the *Set Alpha* node to *Replace Alpha* instead of the default *Apply Mask*.
Recommends GibThom · 2025-06 · Blender Stack Exchange · on “Image rendered and saved is not same”
I got the answer. This video solved my issue just fine : [this video] Im so happy to solve this, it took so long to find a solution.