Tài iệu Photoshop cs5 by Dayley part 101 doc

Chapter 22: Creating and Manipulating 3D Objects 721 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. 32_584743-ch22.indd 72132_584743-ch22.indd 721 5/3/10 10:43 AM5/3/10 10:43 AM Part VII: Working with 3D Images 722 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. n FIGURE 22.25 The 3D Axis Widget 32_584743-ch22.indd 72232_584743-ch22.indd 722 5/3/10 10:43 AM5/3/10 10:43 AM Chapter 22: Creating and Manipulating 3D Objects 723 The widget has three different colored arrows coming out of a cube. Each arrow represents a differ- ent axis or plane: l Red = X l Green = Y l 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: l Cone: Drags or slides the object along the plane represented by the arrow. l Arc: Rotates or rolls the object around the specified axis. l 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. 32_584743-ch22.indd 72332_584743-ch22.indd 723 5/3/10 10:43 AM5/3/10 10:43 AM Part VII: Working with 3D Images 724 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. n 32_584743-ch22.indd 72432_584743-ch22.indd 724 5/3/10 10:43 AM5/3/10 10:43 AM Chapter 22: Creating and Manipulating 3D Objects 725 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 l Home: This returns you to the default view. l 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. l 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. l 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. l 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. l 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. l 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. n 32_584743-ch22.indd 72532_584743-ch22.indd 725 5/3/10 10:43 AM5/3/10 10:43 AM 726 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: l 3D file formats l Creating 3D objects l Changing the position of 3D objects and cameras 32_584743-ch22.indd 72632_584743-ch22.indd 726 5/3/10 10:43 AM5/3/10 10:43 AM . 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. 72532_584743-ch22.indd 725 5/3/10 10:43 AM5/3/10 10:43 AM 726 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: l. 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,