1. Download and decompress the shader files. They are available for the PC or Mac.
2. Launch Carrara and select File|New.
3. Use the Add folder button on Carrara's Browser tray to add the folder where you decompress the files. You should end up with a browser tray that contains entries that look like Figure 1.
4. The first thing to do is come up with the basic shape for the new crop circle. Figure 2 shows the crop circle we will be building in this tutorial. There are two circles, one large, one small, and some perpendicular lines.
5. We need a Base Object for Anything Grows, so select Insert|Plane, turn off the Visible property on the Properties palette, turn off the SHow Object in 3D View, and rename it to Base. This object won't ever be seen, it just provides something to grow crops on.
6. Now it's time to build the first circle, select Insert|Anything Grows and set the following values:
   
   Base Object = Base
   Preview Size = Ultra Low
   Width = .04"
   Length = 1.0"
   Strands = 20000
   Gravity = 0%
   Start Bend Effects at Segment = -2
    
7. With Anything Grows still selected, flip to the Texture room and build a shader that looks like Figure 3.
8. Go back to the Assemble room and rename the Anything Grows object to Big Circle, the Anything Grows master object to Big Circle, and Shader shader to Crop Shader.
9. We now have a basic grassy field, it's now time to build the Wiggle shaders to control the strands. While still in the Assemble room, select Edit|New Master Shader 3 times, select each of them in the Sequencer Tray, and using the Properties palette, name them Noisy Gray, Wiggle X, and Wiggle Y.
10. Select all three of the new shaders and flip to the Texture room. 
11. Go to the X Wiggle shader window and select Operator|Mixer in the color channel. Open the Browser window to the new folder you added in step 3 and drag the Radius into the Blender Slot. Drag X Wiggle into the Source 2 slot, and drag Gray with Noise into Source 1. When you are done, you should have a shader that looks like Figure 4. 
12. Repeat the same thing for the Y Wiggle shader, except of course copy the Y Wiggle browser entry into Source 2 instead.
13. In the Noisy Gray window, drag the Gray with Noise browser file into the Color channel.
14. Go back to the Model room, the Big Circle window should still be open. Set the following properties to finish up the first crop circle.
    
    X Wiggle Shader = Wiggle X
    Y Wiggle Shader = Wiggle Y
    Z Wiggle Shader = Gray Noise
    Wiggle = 1000
     

Part II

Part I showed you how to build a simple crop circle, but the days of simple crop circles are long gone, it's time for something a little more elaborate. The next section will take the existing crop circle to make a smaller one with a line, which we will later connect to the original in Part III.

1. Now it's time to start working on the smaller crop circle. Go to the Assemble room, select the Wiggle X and Wiggle Y master shaders from the Sequencer tray, and then select Edit|Duplicate. You should end up with a couple new shaders called Wiggle X 1 and Wiggle X 2. Rename them to Wiggle X Small and Wiggle Y Small.
2. Select the two new shaders and switch to the Texture room. Here will modify then to make them smaller and include the line.
3. On the Wiggle X Small window, change the Formula shader in the Blender of the Color channel so that P1 = .50. Do the same for Wiggle Y Small. This will shrink the size of the circle.
4.  Now in the Wiggle Y Small window, we will add the line. Drag the Half Y Line browser file to the Blender slot of the Mixer currently in the topmost Source 1 in the Color channel. Drag Gray with Noise into Source 1 of that mixer and set Source 2 = Value = 0%. Your end result should look like Figure 5. Do not repeat this step for Wiggle X Small. 
5. To put the new shaders to use, go back to the Assemble room and select Big Circle. Use Edit|Duplicate, move the new Big Circle to Y = -40" and rename it to Little Circle.
6. Flip to the Model room and when Carrara asks if you want to edit the master or create a new one, select Create a new master and change the following properties:
   
   X Wiggle Shader = Wiggle X Small
   Y Wiggle Shader = Wiggle Y Small
    
7. Go back to the Assemble room and rename the new master object to Little Circle.

Part III

There are now two crop circles separated by 20". It's time to make the connecting line as shown in Figure 2.

1. Create two new master shaders, name them Wiggle X Line and Wiggle Y Line, select them and go to the Texture room.
2. In the Wiggle Y Line window select a Mixer for the color channel. In the Blender drag the Y Line browser file, in Source 1 drag Gray with Noise, and set Source 2 to Value at 0%. Figure 6 shows the completed shader.
3. Select the Wiggle X  Line window and insert a Mixer in the color channel. Drag the Y Line browser file to the Blender, Gray with Noise to Source 2, and insert a Mixer into Source 1. In the new Mixer, drag Gray with Noise to Source 1, select Checkers for Source 2, and Wires for the Blender. See Figure 7 to get the settings.
4. Go back to the Assemble room and select Big Circle. Use Edit|Duplicate, move the new Big Circle to Y = -20" and rename it to Lines.
5. Flip to the Model room and when Carrara asks if you want to edit the master or create a new one, select Create a new master and change the following properties:
   
   X Wiggle Shader = Wiggle X Line
   Y Wiggle Shader = Wiggle Y Line
    
6. Go back to the Assemble room and rename the new master object to Lines.
7. Finally, to create filler areas with no crop circles, do the duplicate and rename steps again this time setting the the X Wiggle Shader and Y Wiggle shaders both to Gray Noise and rename the object and it's master object to Basic Crop. Duplicate the Basic Crop as many times as needed to fill in your field.