Context

背景

The Nodes in this group are in the broadest sense designed for use with projecting color values onto the UVW texture space as well as with the creation or modification of UV coordinates. Since Node Materials are also assigned via a Material tag, their Projection settings can also be used to adjust the mapping. However, if you want to make custom adjustments in the mapping to individual elements of the material, the Context Nodes will help.

这组中的节点在最广泛的意义上被设计用于将颜色值投影到 UVW 纹理空间，以及创建或修改紫外线坐标。因为节点材质也是通过材质标签分配的，所以它们的投影设置也可以用来调整映射。但是，如果您希望对材质的各个元素的映射进行自定义调整，则 Context Nodes 将提供帮助。

This is why most Nodes have separate inputs for Context and Local Context. These can be created by right-clicking on an empty part of the Material Node and making the corresponding selection from the Add Input menu.

这就是为什么大多数节点都有独立的上下文输入和本地上下文输入。可以通过右键单击 Material Node 的空白部分并从 Add Input 菜单中进行相应的选择来创建这些选项。

The Context input represents all UV coordinates of all color inputs used for calculating a given Node. If no further modifications are made, the Material tag’s Projection function will otherwise be used.

上下文输入表示用于计算给定节点的所有颜色输入的所有 UV 坐标。如果没有进一步的修改，则使用 Material 标记的 Projection 函数。

With the Local Context input on the other hand, only the UV coordinates used for that particular Node will be modified.

另一方面，使用本地上下文输入时，只修改用于该特定 Node 的 UV 坐标。

In both cases, the Material tag has the last say and its Offset and Length settings can also be used to affect the projection of the material on a given surface.

在这两种情况下，Material 标签都有最后的权限，它的偏移量和长度设置也可以用来影响材质在给定表面上的投影。

It should be noted that the UV coordinates for Material Nodes start at 0, 0 at the bottom-left corner. The Material tag follows from an older location at which the origin of the UV coordinates lie in the top-left corner of a texture tile.

需要注意的是，Material Nodes 的 UV 坐标从左下角的0,0开始。Material 标记从一个较旧的位置跟踪，在这个位置上，UV 坐标的原点位于纹理贴图的左上角。

Correspondingly, the positive progression of the V axis there in inverted compared to the Material Node.

相应地，v 轴的正向级数与材质节点相反。

了解背景

覆盖上下文

投影

设置背景