b186e60759
Currently, only the visibility of input sockets can be changed dynamically based on other menu inputs. However, under some circumstances, it can also be useful to hide certain outputs. For example, the built-in Curve Arc primitive node does that. This patch adds support for automatic detection of unused outputs. How to detect unused outputs is less straight forward compared to inputs. This patch uses the rule that an output is unused if it always outputs a "fallback value" (typically 0) irrespective of the currently used inputs. If the output is independent of all inputs, it stays visible though. There is a new small utility node called "Enable Output". It replaces a value with it's fallback value unless it is disabled. This simplifies setting up unused outputs. In theory, a normal switch node can also be used, but that is less usable and the user will have to hardcode the fallback value for each type which is not something that is explicitly exposed yet. Supporting dynamic output visibility is also a prerequisite for exposing some menu node options as sockets (e.g. in the Arc node). Pull Request: https://projects.blender.org/blender/blender/pulls/140856
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