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Trong một nghiên cứu gần đây được tiến hành bởi Viện Kho dữ liệu, 86% số người được hỏi nhận thức đầy đủ ý nghĩa của một chiến lược quản lý siêu dữ liệu. Tuy nhiên, chỉ có 9% đã thực hiện một giải pháp siêu dữ liệu. 16% khác đã có một kế hoạch và đã bắt đầu làm việc trên thực hiện. Nếu hầu hết các công ty với kho dữ liệu nhận ra tầm quan trọng to lớn của siêu dữ liệu. | 3D in Photoshop 1.3.3. Depth of Field In addition to the position and direction of the camera Photoshop CS5 can also simulate the aperture of the camera. This is done using the depth of field settings. With these you specify the part of your scene that is in focus and that which is not in much the same way you focus a lens on a subject when taking a photograph Figure 1.4a . FIG 1.4a Depth of Field set so that the front of the truck is in focus the plane of focus and everything else in front of or behind this plane is out of focus. In Photoshop CS5 cameras have a pair of new parameters that allow an artist to control depth of field. The Distance control determines the plane in the scene where everything is in focus and the Blur control determines how out of focus the areas behind and in front of the focus plane are Figure 1.4b . FIG 1.4b With the Camera Zoom Tool selected you can set the distance of the focal plane and the amount of blur. 6 Scene 1.4. Lights Visual perception is our perception of how light interacts with matter. Therefore lighting is a key component of a 3D scene similar to the importance of lighting in photography. Generally light interaction with an object is a very complicated process. Though the primary intent for 3D rendering is to reproduce the light interaction with materials steps are taken to simplify and approximate these calculations. One such step is to limit the supported types of light sources. In Photoshop CS5 four types of light sources are supported. The first three are standard lights that can be found in one form or another within any 3D rendering package point infinite and spot lights . 1.4.1. Point Light In some applications this also may be known as an omni light. A point light is a light source emitting light equally in all directions. You can think of this like a candle or a light bulb. These types of lights have position but do not have a direction Figure 1.5 . FIG 1.5 A point of light depicted by a spherical widget. 7 3D in
