How to Simulate Fire and Smoke in Blender

Creating realistic fire and smoke in Blender is a straightforward process thanks to the software's powerful Mantaflow physics engine. This guide provides a step-by-step walkthrough on how to set up a quick gas simulation, adjust the domain settings for optimal detail, configure the fire and smoke emitter, and set up materials in the shader editor to render a realistic, high-quality effect.

Step 1: Create the Emitter and Domain To begin, you need an object that will emit the fire and smoke, and a domain container that dictates the boundaries of the simulation.

  1. Open Blender and add a mesh, such as an Ico Sphere, to act as your emitter.
  2. With the sphere selected, go to the top menu and select Object > Quick Effects > Quick Smoke. Blender will automatically generate a bounding box around your sphere. This box is the "Domain." It also applies the necessary fluid physics modifiers to both objects.

Step 2: Configure the Flow Settings Next, define what the emitter object produces.

  1. Select your emitter (the sphere inside the box).
  2. Go to the Physics Properties tab on the right.
  3. Under the Fluid settings, ensure the Type is set to Flow.
  4. Change the Flow Type from "Smoke" to Fire + Smoke.
  5. Set the Flow Behavior to Inflow so that fire and smoke continuously emit over time.

Step 3: Adjust the Domain Settings The domain controls the quality and behavior of the simulation.

  1. Select the Domain box.
  2. In the Physics Properties tab, locate Resolution Divisions. Increase this number (e.g., to 64 or 128) for higher-resolution, more realistic details. Note that higher numbers increase bake times.
  3. Scroll down to the Gas settings. Here, you can adjust Vorticity to add turbulence and swirls to the smoke.
  4. Enable the Noise checkbox. This adds extra high-resolution details to the fire and smoke without requiring a massive increase in base resolution divisions.
  5. In the Cache section, change the Type to All and set your desired frame range. Click Bake All to calculate the physics simulation.

Step 4: Set Up Materials and Render To make the simulation look realistic, you must configure the volume shader.

  1. Select the Domain box and open the Shader Editor workspace.
  2. Blender automatically creates a Principled Volume node connected to the Material Output.
  3. To make the fire visible, locate the Blackbody Intensity slider and set it to 1.0 or higher. This enables the emissive thermal glow of the fire.
  4. Adjust the Blackbody Tint if you want to change the color temperature of the flames.
  5. Increase or decrease the Density value to control how thick and dark the smoke appears.
  6. Switch your render engine to Cycles in the Render Properties tab for the most realistic lighting and volume depth.