topic Re: How to scale fire examples onto larger objects? in Bifrost Forum

How to scale fire examples onto larger objects?

xfan10 — Thu, 03 Apr 2025 20:49:21 GMT

How can I take a Fire graph that came with Maya and scale it up to a larger object without losing the fire? Every time I enlarge the mesh, it emits just smoke or illuminated smoke. Im trying to set a car on fire so the object needs to be about 10ft x 5ft. All the pre-bulit Fire Graphs like Torch and barrel are like 1 centimeter.

Attached is the car body with the Barrel Bifrost Graph example attached without the barrel collider.

Re: How to scale fire examples onto larger objects?

darioOrtisi — Fri, 04 Apr 2025 08:47:55 GMT

You will use the scene unit meter on solver settings to match the scale of your object in scene.

Re: How to scale fire examples onto larger objects?

xfan10 — Fri, 04 Apr 2025 13:57:39 GMT

so if the object is scaled up from 1cm to 10ft, whats the calculation used to calculate the scene unit setting?

Re: How to scale fire examples onto larger objects?

Christoph_Schaedl — Mon, 07 Apr 2025 07:00:17 GMT

I would export a VDB and scale that.

Re: How to scale fire examples onto larger objects?

darioOrtisi — Mon, 07 Apr 2025 07:36:15 GMT

You can take this into consideration. Bifrost by default is in meters(unit meter = 1), which means that if you want a realistic simulation, your object must also be scaled accordingly, or you need to convert the unit meter to the scale of your object. For example, one meter corresponds to 3.28084 feet. According to this value, if you know that your object is X feet, you can derive your conversion.