The image on the right is rendered with transparency map. The black background of the texture map is blocking part of the cup. You will get the result as left image if you apply the texture map directly without transparency map. The more objects you get, the longer the rendering time you would need. Although you can ignore material settings by creating the actual model of objects, that will increase both the number of objects in the scene and the file size. Many users try to avoid using transparency mapping and model the actual object in the scene. This is used mostly for creating product logos, stickers and numbers. The difference is that this is using alpha channel to get rid of unwanted part of the Bitmap, saving only the part covered by alpha channel. Transparency mapping is another method using Bitmap to create materials.
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