I was wondering how to make an animated camp fire the other day, so I
had a play around and figured it out and I saved off pics as I went
along and wrote this, I hope you find it useful! The image above shows
the kinda thing you can create and animate quite easily in Cinema 4D!
OK first things first we make a stick! 1.
Create a Cylinder and set 2. Height segments to 6 and rotation segments
to 12, 3. sep cap segments to 1 so we have a fairly low detail cylinder
4. MAKE EDITABLE, also drop in a FLOOR object.
1. go into POINT MODE and 2. Using the select/move/scale/rotate tools bend and twist the cylinder into a log type shape as shown
Now we want to apply bark to the outer
parts and light wood to the ends! 1. go into FACE MODE and 2. making
sure the STICK object is selected select all faces EXCEPT the end ones
as shown, 3. Using the select tool. Now goto SELECTION=>SET
SELECTION
1. Now click SELECTION 2. INVERT and 3. SET SELECTION again and 4. we
have two selection TAGS added to the stick, one for the bark and one
for the ends! They are currently called "Polygon Selection" in te next
part we will give them a more useful name.
1. OK DOUBLE CLICK the 1st selection tag
and 2. give it the name "Stick" 3. DOUBLE CLICK the second tag and name
it "ends" in a minute we will use these names to apply the materials to
the right parts!
 Click to enlarge |
1. Create a new material and in the COLOR
channel, 2. Choose the WOOD shader and 3. Change it to a dark brown and
black texture (also copy this into the BUMP channel) and 4. Drag and
drop this material onto the stick object.
1. Click the material assigned to the
stick and 2. in the SELECTION box type "stick" this limits the material
to the selection we specified earlier and 3. change it to CUBIC
mapping.
1. Copy/paste the material and change the
new one to a lighter wood and drag and drop this onto the stick object
2. Type "ends" into the SELECTION box and choose cubic, this limits the
light wood to the end faces we selected and SET before.
 Click to enlarge |
1. Click the stick object and press CTRL+C
and then CTRL+V to paste a copy, do this 5-8 times, 2. Use the select,
move, rotate and scale tools to create various sizes and positions with
the new copies aiming for a pyramid type shape.
Make a load more copies, scale and rotate
em etc to form the firewood, 1. Drag a box around them all as shown and
RIGHT-CLICK and Choose GROUP OBJECTS or press G to group, rename the
group "Sticks"
It needs some bricks so 1. create a cube,
subdivide it and pull its points around a bit to make it irregular 2.
Create a material and 2. Choose a dark colour and 3. Choose a noise as
the bump map to give it a bit of texture.
Copy and paste the brick 8-12 times and
move/rotate it to form a ring around the base of the fire as shown.
Select all the bricks and press "G" to group em, rename em "bricks"!
1. Now for some lighting, create a light
and 2. Choose a light blue colour 3. set its brightness to about 40%
and 4. set it to "OMNI" set the shadows to "SOFT" 5. position the light
high above and off to one side as shown, this is to simulate a kinda
dark night-time lighting that the fire will light up...
 Click to enlarge |
Now for the fire light, 1. Create a light
and name it "firelight" 2. Choose a bright yellow colour, 3. Choose
"OMNI"...NO SHADOWS (try turning them on later)...and set visible light
to "VISIBLE" and also in the DETAILS section set FALLOFF to LINEAR. 5.
Scale the Visible light to fit the middle of the fire and 6. scale the
FALLOFF to about 2 or 3 times the fire size, this is how far the light
goes. As with everything these settings may need to be tweaked to suit
your situation.
Ok now to create the actual flames, we
start by creating a CYLINDER and scaling IN the top points to create an
almost cone shape, the bottom should roughly fit the base of the fire!
 Click to enlarge |
Create another new material and 1. in the
Color channel choose the FIRE shader, 2. Set it as shown to go from
black to orange to yellow then to white, these settings can create
different types of fire etc so experiment with them!! 3, After you get
a color you like copy it into the LUMINANCE channel and the ALPHA
channel now 4. Drop this onto the fire object we just created.
After a quick render it needs tweaking so we set the Transparency to about 50% or something like that.....
..and 1. turn on GLOW 2. set to 50% - 80%
or higher if you want a denser glow, again its time to experiment!! 3.
We make several copies of the fire object and 4. Scale them to various
sizes, rotate them various amounts etc so the flames aren't all IN-LINE
and the SAME SIZE! The beauty of the Flame shader is its already
animated but we will be controlling it a little...read on...
OK First we are going to animate the
firelights' brightness, 1. press SHIFT+F3 to bring up the timeline, 2.
Select the firelight and NEW TRACK 3. Select "PARAMETER" and 4. choose
"BRIGHTNESS" this creates a new track to control the brightness of the
light!
1. Select the BRIGHTNESS track and 2.
RIGHT-CLICK and add a NEW KEY and input frame 0 simply CTRL+DRAG to
copy this key frame or as I found out after this pic was grabbed you
can CTRL click to input KEYFRAMES at the mouse cursor, see next step...
1. CTRL click a load of keyframes as
shown, then 2. pull alternate points to vary the brightness of the
light over time, make sense?? hope so :-)
We are gonna do the same for the Vertical
scale of the fire objects to help them flicker, 1. Select "fire" and
NEW TRACK 2. PARAMETER 3. SCALE and 4. "Y" and again add a load of
keyframes using CTRL and Click then vary the graph underneath, this
will have the effect of scaling up and down the fire object over
time...
Do the same for the other two fire
objects, here we see each object, the light and the 3 fire objects and
their keyframes/graphs, basically this gives an amount of randomness to
each element, also by dragging a box around keyframes you can CTRL copy
them further along to create more frames, I did this by making 30
frames then CTRL Copying them several times to fill the 90 frame
animation!!
IMPORTANT POINT: 1, Select EACH fire
object and 2. move its PIVOT to its base so that when they get scaled
in the above steps, the fire scales up/down from its base rather then
its middle!!
Click here to download 700kb(avi) example movie
I
also added an EMITTER and pointed it upwards, dropped a small CYLINDER
into it and added the flame texture to it, this gives the effect of
small bits of hot-ash rising from the fire as well, you could also add
smoke in a similar way ;-) Hope you found this tutorial useful!!