Tài iệu Photoshop cs5 by Dayley part 101 doc

Chapter 22: Creating and Manipulating 3D Objects
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FIGURE 22.23
Use the Scale tool to make 3D objects larger or smaller.
Changing positions and saving a view
As you manipulate a 3D object, you can change the position of it to several presets, as shown in
Figure 22.24. When you change the position of your object using the menu, you lose any position
changes you have already made to it.
If you’ve created a position that is different than any of the presets, you can save the position by
clicking the Save button and naming the new position. It is then added to the list of presets, and
you can access it at any time. You can delete the view by selecting it in the drop-down menu and
clicking the garbage can.
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Part VII: Working with 3D Images
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FIGURE 22.24
Changing the position of this pen and ink stand allows you to see it immediately from the top.
Using the 3D Axis Widget
As you’ve used the tools to manipulate your 3D object, you’ve probably noticed the colorful widget
shown in Figure 22.25. It moves with your 3D object and is a good visual representation of its
position. It’s so much more than that, however. You can use it to perform all the manipulation
techniques that I’ve just shown you how to do with the 3D object tools. I show you how.
Note
The 3D Axis Widget appears by default when you have a 3D layer selected. If the 3D Axis Widget isn’t visible
in your 3D workspace, click the Toggle Misc 3D Extras button at the bottom of the 3D panel and select 3D
Axis.
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FIGURE 22.25
The 3D Axis Widget
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Chapter 22: Creating and Manipulating 3D Objects

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The widget has three different colored arrows coming out of a cube. Each arrow represents a differ-
ent axis or plane:
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Red = X
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Green = Y
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Blue = Z
The end of each arrow has three different shapes: a cone, an arc, and a cube. Each of these shapes
represents a movement. Hover over each shape, and it becomes highlighted. Your mouse icon
changes into a different manipulation tool that represents the movement of the highlighted shape,
as shown in Figure 22.26. Click and drag to use each tool:
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Cone: Drags or slides the object along the plane represented by the arrow.
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Arc: Rotates or rolls the object around the specified axis.
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Cube: Scales the object. Because you are using only one plane, the object isn’t scaled pro-
portionately.
FIGURE 22.26
Each of the shapes at the end of the arrows can be used to manipulate your object along the selected axis
or plane.
If you are not specifically over an area of the widget, but just generally hovering around it, your
mouse icon turns into the Rotate tool, and you can click and drag in any direction to freely rotate
your object around any axis. If you hover closer to the center cube connecting the arrows, an
orange square plane appears that connects two of the arrows. This constrains the rotation to the
two axes that are connected by the plane. For instance, if the orange square connects the green and
blue arrows, you can freely rotate your 3D object around both the Y and Z axes, based on the
direction you move your mouse, but not the X axis.

Hover directly over the square, and it turns yellow and your mouse icon changes to the Drag tool.
Now you can drag your object along the two indicated planes. Hover directly over the cube, and
the Scale tool appears, allowing you to scale your object proportionally, as shown in Figure 22.27.
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FIGURE 22.27
Using the connecting squares and the cube allows you to move and scale more than one axis or plane.
The 3D Axis Widget isn’t always the easiest tool to use, especially if you want to make small, con-
trolled movements, but it is certainly the most convenient. With a little practice, you can make
quick, controlled manipulations without having to toggle through the 3D object tools.
Positioning the Camera on a 3D Object
You can position and reposition the camera that is viewing the 3D object. These movements are
very similar to moving the object, allowing you to view your object from any angle. A few subtle
differences let you know you are working with and moving the camera rather than the object.
Probably the first difference you notice between changing a camera view and manipulating the
object is the lighting. When you manipulate the object, the camera and the lights are stationary
and the object is moving. Therefore, the light changes on the object as it turns and rotates. When
you move the camera rather than the light, however, both the object and the light are stationary, so
the light stays constant on the 3D object.
Because the movements you make are to the camera, another difference you see right away is that
your view shows you a mirror image of your actions as you drag the mouse. For instance, as you
orbit the camera left by clicking and dragging to the left of your object, your object appears to be
rotating to the right.
When you select a 3D camera tool in the Toolbox, the options bar changes to reflect the fact that
you are working with the camera rather than the object itself, as you can see in Figure 22.28. The
tools themselves have very similar functions to the object tools, so I introduce them more briefly:
Note
Notice that the 3D widget also changes when you select the 3D camera tool. It now shows a camera icon just
under its menu bar. With the 3D camera tool selected, the widget moves the camera instead of the object.

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Chapter 22: Creating and Manipulating 3D Objects
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FIGURE 22.28
The 3D camera tools are similar in look and function to the 3D object tools.
Tool
presets
Orbit Pan Zoom Save current view
Delete currently selected view
Home (return to initial camera position)
Roll Walk
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Home: This returns you to the default view.
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Orbiting with the camera: Unlike moving a 3D object by rotating it, orbiting the camera
moves the camera around your object. As you orbit the camera, it is oriented toward the
central XY point on the object and continues to stay the same distance from that point.
You can orbit the camera in a perfect circle around a 3D object’s center point.
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Rolling the camera: Rolling the camera is similar to rolling an object. The camera itself
rotates around its Z-axis, changing the orientation of the object in the camera’s view. You
can roll the camera from side to side around its Z-axis by using the Roll tool in the
Camera Transformation toolbar.
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Panning the camera: Panning the camera moves the camera up and down or back and
forth on its XY plane, moving the object accordingly in the view of the camera. You can
pan the camera by selecting the Pan tool in the Camera Transformation toolbar.
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Walking the camera: Walking the camera is similar to sliding a 3D object. Instead of

moving the object back and forth in space, you are going to walk the camera closer to or
farther away from your object. You can walk with your camera using the Walk tool in the
Camera Transformation toolbar.
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Zooming the camera: Changing the focal length of the lens of a camera allows you to
zoom the view in and out. The Zoom tool works the same way. Zooming allows you bring
the object closer in the camera’s view without actually walking toward the object.
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Changing the view: The view allows you to change the position of the camera to a preset
and save your own presets, just as you could use and save preset positions with the 3D
object tool.
Note
As with the 3D object tools, you can change the position of the camera numerically. You also can hold down
the Alt/Option key to temporarily change the XY tools into the Z tools, and vice versa.
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Part VII: Working with 3D Images
Summary
In this chapter, I introduced you to creating and using 3D objects in Photoshop. You learned about
these things:
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3D file formats
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Creating 3D objects
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Changing the position of 3D objects and cameras
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