2012年10月23日星期二

timing adjustments make it flow in maya

timing adjustments make it flow in maya

timing adjustments make it flow in maya
Autodesk Maya, also known as simply Maya, is three-dimensional graphics software developed by Alias Systems Corporation and currently owned by Autodesk Inc. With Maya, you can create three-dimensional models and animations and render UV mapping effects such as texture. Maya gives you a lot of flexibility to play around with your object texture. Choose the texture that best serves the needs of your 3-D object.
to replace a surface's solid color with a texture. Normally, a texture refers to applying a 2D image around a 3D surface, rather like wallpapering a curvy surface. Because a 2D image can be stretched, wrapped, and projected onto a surface in many different ways, you must take control of how the image is applied.
Mapping Coordinates
Mapping coordinates, also known as UV coordinates, tell the 3D renderer how to place the 2D map across the geometry, which varies depending on whether the model is created from NURBS or polygons. For NURBS, parametric mapping is inherent to the surface and this is typically what's used. Because NURBS are already parametric surfaces, mapping can automatically flow smoothly across the surface. You can also adjust NURBS mapping, to move and rotate how the map is positioned on the object.
For polygon surfaces, mapping is normally applied by projecting 2D maps across the 3D surface in one of several ways: planar, cylindrical, spherical, and a special method called automatic mapping. As you might expect, when you apply a 2D texture to a 3D object with a planar map projection, you'll see a smearing effect in areas of the object that's perpendicular to the direction of the map projection. The cylindrical and spherical projections would seem to solve this problem, but both mapping types have their drawbacks—singularities. These are points at the poles of the sphere or cylinder where the mapping is pinched into a point (see Figure 8.15). Generally, you must apply the best mapping method for the surface and the areas seen during the animation. That is, if the ugly part is in an area that won't be visible to the camera during the animation, the problem is solved. In tough cases, a combination of automatic mapping, multiple mapping coordinates, and lots of photoediting work can usually fix the problem.
Maya's Interactive Texture Placement
To make adjusting mapping on a surface less confusing, Maya offers interactive texture placement. This feature lets you see the maps move on the surface in real time as you move, rotate, and scale the manipulator for the mapping. To make this work, you need to have Hardware Texturing turned on for at least one of the 3D panels. To do that, select the panel (RMB-click over the panel) and then click Hotbox | Shading | Hardware Texturing (hotkey: 6). By default, materials with a texture applied to the Color attribute have the color texture map set to appear in the hardware-textured panels.

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