## Graph

### 1. Support of math nodes (or non-AnimNodes in general)

* Enables animators to add custom math for blend inputs or to adjust other inputs (e.g. LookAt or IK
  targets).

**Open Issues**

1. When to do the evaluation? Two types of subgraphs:
   a) Instant inputs (needed for blend node inputs) that have to be evaluated before
   UpdateConnections
   b) Processing nodes, e.g. for extracted bones.

### 2. Support of multiple output sockets

* E.g. extract Bone transform

* Increases Node complexity:
    * AnimOutput
    * AnimOutput + Data
    * Data

(Data = bool, float, vec3, quat, ...)

**Open Issues**

1. Unclear when this is actually needed. Using more specific nodes that perform the desired logic
   may be better (
   c.f. https://dev.epicgames.com/documentation/en-us/unreal-engine/animation-blueprint-bone-driven-controller-in-unreal-engine).
   Likely this is not crucial so should be avoided for now.

### 3. Multi-skeleton evaluation

Use case: riding on a horse, interaction between two characters.