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This is the second part of a series of tutorials I'm doing about creating isometric illustrations in Adobe Illustrator. If you've missed that first tutorial I suggest you start with Working with Orthographic Projections and Basic Isometrics. Let's get started!
In the last tutorial I covered how to make an isomeric grid and build simple blocky shapes on it. In this tutorial I'm going to talk about another method of creating isometric shapes that doesn't require
a grid and is much more useful if your objects are complex or curvy.
When creating a complicated isometric illustration it's best to begin by breaking down your object into its simplest parts. This will help to make the project more approachable. It is possible to make the most complex objects entirely on an isometric grid using the method I discussed in the last tutorial. There is another method that is much more useful for creating curvy or complex isometric objects in Adobe Illustrator. I'm going to call this method scale, shear, rotate or SSR.
The basic idea behind the SSR method is that by using tools in Adobe Illustrator you can place an object onto an isometric plane without using a grid. This method is most useful for curvy or complex objects but it will work for anything. I'll begin simply by making an isometric cube. Follow the steps below for the SSR Method.
Create a 4 inch square with your Rectangle tool.
With the square selected double-click on your Scale tool. Scale the square 86.062% vertically.
With your object selected double-click on the Shear tool and shear the object 30 degrees.
With the object selected double-click on the Rotate tool and rotate it -30 degrees. You have now created the top of your cube.
To create the left side of the cube, begin with a 4 inch square. Scale vertically 86.062%, Shear -30 degress, and Rotate -30 degrees.
Use the selection tool (black arrow) to line up the front corner with the top of the cube.
To create the right side of the cube, begin with a 4 inch square. Scale vertically 86.062%, Shear 30 degrees, and Rotate 30 degrees.
Next, move the pieces into place with your Selection tool. You have now created an isometric cube without using a grid.
The power of this method becomes apparent when you try to create an object that would be very difficult to construct on a grid. This method only works if you have a set of orthographics to work with.
Making a Stratocaster Using the SSR Method
For this example I'm going to build the body of a Guitar. To make this complex shape in isometric using only a grid would be a challenge. The complex curves and compound shapes would be very difficult to recreate accurately.
There are many ways to make a set of orthographics depending on your object. You can look online for a set of blue prints, you could trace a photo, and if you own the object you could take it
apart and measure it. Use whatever method works best for your project.
One quick Google search and I've found the perfect set of factory blueprints of the "62 vintage re-issue Fender Stratocaster." These blueprints are much more detailed then I need, but you can be as precise as you'd like for your own projects. Having too much information about your object is never a bad thing.
Trace your blueprints. I'm going to trace just the information I need to complete my isometric, and I'm going to simplify parts of the design.
Once you've chosen your orientation you can scale, shear, rotate (SSR), your bottom plane.
You can check your work by comparing any edges that in the orthographic are 90 degrees or 180 degrees. These edges will now fall onto an isometric grid; they will either be on the 30 degree or 150 degree angle.
Now that you've created your base you have something to work off of. By taking the side view of the orthographic and scale, shear, rotate (SSR) it onto the Isometric plane you can figure out the thickness of the guitar body.
Line up the bottom edge of the guitar body with the corner of the orthographic side view.
Next you want to copy the outline of the guitar body and move it up to the top edge of the side view. To do this use your Selection tool and click and drag on the edge of the outline, before letting go, engage the Option button to make a copy. You should also use the Shift key to constrain the movement. Holding the Shift key while moving the shape will ensure it stays lined up with the original.
Now you have blocked out the top and bottom planes of the guitar body. The next step is to cut out the spot where the neck is inset. Start by connecting the top and bottom planes of the neck opening so
it's easier to see the area that you are working on.
Using the side view you can mark off how deep the neck cutaway goes into the body. You now have three planes, the top, bottom and depth of the cutaway.
The next step is to use the Scissors tool to cut away all the excess lines you don't need anymore. This is often the hardest part for an artist new to technical drawing. All the overlapping lines and shapes can be overwhelming. But if you take your time and start with the clear big shapes it will help to clean up the more complex areas.
After clearing away all the line you don't need anymore, connect your corners and finish the shapes.
Add some line quality and you're finished.
You have now finished the body of the guitar. You could continue on and complete the entire guitar, the exact same steps would apply for each part. This is an example of an exploded isometric of a Stratocaster I did a few years ago with this method.