There is only one view map per view layer. It controls the edge detection parameters. Freestyle can be enabled/disabled per View Layer by toggling the checkbox in the panel header.
Lines are rendered via parameters defined in a user-friendly interface to define and control Line Sets and line styles.
A view map (hence a view layer) can have multiple Line Sets, and each line set is linked to one line style.
- Python 脚本编写模式
Lines are rendered via Python scripting, powerful but complex.
Although the View Map Cache checkbox is a view layer option, the cache memory is shared by all view layers and scenes. This means that if Freestyle is used for two or more view layers (possibly in different scenes through the Compositor), then the cached view map for one view layer is replaced by a new view map for another view layer and hence no performance gain is expected.
Freestyle lines will not immediately be visible on top of the render image. Instead, Freestyle lines are rendered as a Render Pass which can be composited with the rendered image with an Alpha Over node.
Ignore the edges that are out of view. (Saves some processing time and memory, but may reduce the quality of the result in some cases.)
Takes Smooth Shading into account for edges calculation.
Affects the calculation of curvatures for Ridge, Valley and Suggestive Contour edge type selection in a line set. The curvature at each vertex is computed by averaging the shape of the surface within the specified radius. Increasing the value reduces noise and detail.
- 极小 Kr 导数
Controls the threshold on the minimum rate of change of curvature used to filter the output of the Suggestive Contour edge type selection. Increasing the value reduces the amount of rendered lines, starting from smoother areas of the object (further information in this pdf).