Creating_Realistic_Fire_in_Blender.pdf

Simulation // Materials // Rendering // Compositing

Creating Realistic Fire

by Andrew Price

Learn how to harness the power of the smoke simulator to create impressive pyro efects!

in Blender 2.5

About the Author

I started using Blender in 2002

because I loved 3d art and

wanted to make my own. I didn’t

have thousands of dollars to drop

on expensive software, so Blender

seemed like a good alternative.

But I soon realized that Blender

was more than just a free

program, it was a professional

suite that can create stunning art.

In early 2009, I started the

website BlenderGuru.com with

one goal in mind; To create

serious tutorials for serious

artists.

I hope you enjoy this eBook.

Andrew Price

BlenderGuru.com

NOTE: This tutorial was created with Blender

2.5 Alpha 1. Depending on your version, your

screen may look different to the screenshots in

this tutorial.

Creating Realistic Fire in Blender

PART ONE

Setting up the scene

Before we get into the fun

simulations, let’s setup the

scene.

If you are new to the smoke

simulation. I’d recommend

watching my Introduction to

Smoke Simulation video.

Select the default cube and scale

it along the Z axis to make a tall

rectangular prism. This will act as our

domain object that all smoke and ire

will be created in. It is important that you

scale this in object mode only or it can

create problems later.

We need a low object to emit

smoke. Create a plane, and place

it inside the cube. Scale it down slightly

and place it near the bottom of the cube

to ensure the simulation runs smoothly.

PART TWO

It’s cool to smoke

Now we get onto the fun stuff.

The domain object controls how

both the smoke and ire will

move.

Change the default lamp to a

spotlight and set the energy level

to 2. You may wish to give it a subtle blue

tint to imitate the night sky.

Position the camera in front of the

domain. You can do this quickly by

going to the front view ( NumPad 1 ) and

hitting Ctrl + Alt + NumPad 0 . You may wish

to position the camera so the top of the

domain cube isn’t visible. That way the

smoke won’t suddenly disappear out the

top.

For the best results I’d

recommend watching some

videos of real ire so you have

something to aim for. You

can ind a great selection of

reference video at Pond5.com

With the cube selected, go to

the physics panel and under the

smoke settings click Add. Four options will

appear: None, Domain, Flow and Collision.

Click Domain .

Set Divisions to 80 , Heat to 0.2500

and check Initial Velocity . This will

make the ire shoot out of the plane.

Underneath those settings, check

the Smoke High Resolution box.

This will create high resolution detail to

the outside of our smoke. In this panel,

change the Resolution to 2 and the Noise

Method to FFT .

February 2010

blenderguru.com

Creating Realistic Fire in Blender

PART THREE

Fueling the Flames

Whilst most of the smoke

behavior is deined by the

controls of the domain object,

the low object also plays a part.

The amount of particles you

select play a major role in how

the fast smoke moves.

Select the Plane object, go to the

particle settings panel and click

the + button to create a new particle

system.

Set the particle amount to 40,000

and the Lifetime to 1 . Because we

enabled Initial Velocity in our domain, the

Normal value will deine how fast the ire

is shot from our emitter. Change this to

0.5

To ensure our particles don’t show

up in the render, set the Render

type to None . We don’t need to see the

plane either, so disable the Emitter .

With the particle system in place,

switch to the physics panel and

under the smoke tab hit Add and Flow.

Click the blank box under Particle System

and select ParticleSystem from the drop

down list.

Save your work now, because it’s

time to bake . Select the domain

object and in the Smoke panel, scroll

to the Cache section and hit Bake All

Dynamics .

Now go make yourself a cup of coffee.

This may take a while.

PART FOUR

Rendering smoke

It looks pretty in the 3d

viewport, but it won’t show up

in the render yet. This is where

you can deine how your smoke

appears in the renders.

Success! Once the simulation has

inished baking, save your work .

Select the domain and add a new

material . Change the material type

to Volume . Set the density to 0 , Density

Scale to 2 , Scattering to 2 and Step Size to

0.010

February 2010

blenderguru.com

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