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Begin by finding a blueprint for a car you'd like to model. A good place to start is The-Blueprints.com. This site features hundreds of detailed blueprints of cars of all makes and models. It is important to choose a blueprint that includes images of the front, back, top and sides of the vehicle. Save the blueprint to your computer, bring it into an image editing program, and separate each view into its own file. Save each image as a .jpeg, and name them accordingly (i.e. top.jpeg, side.jpeg).
Open Cinema 4D, create a new project, and press "F5" to open up all of the view ports. Within each view port, click the "Edit" menu, followed by "Configure." This will create new configuration boxes in the attribute manager. Click the "Browsing" button on the right side of the "Image" attribute and choose the .jpegs you've saved to your hard drive. You'll want the top view, side view, front view and back view each in their own view port. Change the "Rotation" attribute of each image to make sure that they're all facing in the same direction. -
Create a Symmetry object (from the menu just above the word "Filter") and a Polygon object (from the Objects menu). Drag the Polygon object onto the Symmetry object in the Objects Editor. Select the Polygon object, enter Point Mode using the menu on the left of your screen, and create a new point by clicking the "Structure" menu, followed by "Add Point." Decide where you'd like to start modeling the vehicle; for most people, this will probably be the front or rear bumper. Control-click anywhere on the blueprint to add a point. Continue by adding more points along the outlines of your blueprint. If you accidentally put a point in the wrong place, you can move it simply by selecting it and dragging the arrows that protrude from it. You don't need to add an excessive amount of points; just follow the general curve of the lines, and Cinema 4D will "connect the dots" for you.
Note that you'll only have to model one half of the car. The Symmetry object you originally created will fill in the opposite half for you automatically. After you've modeled the points for one small section of the car, click the "Structure" menu, followed by "Bridge." This will connect your points with polygons.
