tailieunhanh - Introducing 3ds Max 9 3D for beginners apr 2007 - part 7

Tạo ra các ảnh thật hơn. Sử dụng bộ tô bóng mental ray® để dễ dàng tạo những bầu trời đẹp với bóng trên mặt trời hoặc trên bề mặt kim loại của sơn ô tô. Ngoài ra, giới thiệu môi trường mới, các hiệu ứng bao quát, khúc xạ và phản xạ tạo ảnh thật, kết quả ngất ngây. | more mapping exercises 313 Later in the chapter you will learn a more efficient way to edit the image on the object known as UVW mapping. Opacity Maps Opacity mapping allows you to cut out parts of an object by making those parts invisible. You can also create wonderful fading effects using Opacity maps. With opacity mapping you don t have to model certain details which can be a real time saver. In this example you will create a chain link fence. However you will not model a fence. You will create it entirely from mapping. To make a chain link fence follow these steps Figure The chain link texture 1. Open the Chain Link Opacity file in the Texture Scene Files folder on the companion CD. Open the Material Editor and select a sample slot. First you are going to add a bitmap to the diffuse color so go to the Maps rollout. Select the bar next to Diffuse Color. Pick Bitmap from the Material Map browser and navigate to the Texture Scene Files folder on the CD. Choose Chain shown in Figure . 2. Go to the Coordinates rollout and change both the U and V Tiling parameters to . This will scale down the image because the image repeats three times. 3. Apply the Material to the Plane geometry in the scene. Click the Show Map in Viewport button. Render and you will see something similar to Figure . As you can see the Chain Link image appears on the plane but you can t see the objects on the other side. Figure The chain link fence is rendered. 314 chapter 7 Materials and Mapping 4. Go to the Material Editor. Click the Go to Parent button to get to the Maps rollout for the parent material. Click on the bar next to Opacity and select Bitmap from the Material Map browser. In the Explore window navigate to the Texture Scene Files folder on the CD and select Chain Link shown here . 5. The tiling values for the Opacity map must be the same as the diffuse map otherwise the transparency of the fence will not line up with the links of the .