add nodes index

Home.md

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 # StreamGraph Wiki
 
-This is the home of the StreamGraph wiki
+For a list of nodes, check out the [Nodes index.](/Nodes)

Nodes.md

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+# List of nodes
+
+Every node that exists in StreamGraph as of the latest revision is listed here, separated by category.
+
+## General
+General-purpose nodes.
+### Bool Constant
+A checkbox output.
+### Expression
+A node returning the result of a mathematical expression. Uses Godot's `Expression` class. [See the Godot documentation for more details.](https://docs.godotengine.org/en/4.2/classes/class_expression.html)
+
+Has a Dictionary input that can be accessed in the expression with `input`.
+
+Also has access to the parent Deck's variables, accessed with `deck_var`.
+### Button
+A button to trigger certain nodes that have a trigger input.
+### String Constant
+A text field output.
+### Pass If True
+Passes received input if *and only if* the condition input is true.
+### Get Dictionary Key
+Returns the value of a key from a dictionary input, if it exists, or null otherwise.
+### Delay
+Passes through a received input after the set time.
+### Print
+Print a value to the console. Prioritizes input port connections over the text entered in the text field.
+### Set Deck Var
+Set a variable on the parent deck on trigger.
+### Get Deck Var
+Returns a previously set deck variable, or null if it does not exist.
+### Process Loop
+Sends a trigger output every frame, and returns the delta value (time since last frame in seconds).
+
+## Math
+Nodes for working with math.
+### Compose Vector
+Returns a vector from two numeric inputs.
+### Decompose Vector
+Returns the X and Y components of a vector.
+### Add Vectors
+Adds two 2D vector inputs and returns the result.
+### Subtract Vectors
+Subtracts each component of the given vectors and returns the result.
+### Normalize Vector
+Normalizes a vector so its' length (magnitude) is exactly 1.
+### Vector Dot Product
+Returns the dot product of two vectors.
+### Multiply Vector by Scalar
+Multiplies a vector by a numeric value.
+
+## OBS
+Nodes for interacting with OBS.
+### Set Scene
+Sets the current scene in OBS.
+### Set Source Transform
+Sets an OBS source's transform, which includes position and rotation, among other things.
+### Decompose OBS Transform
+Splits an OBS transform from one object into multiple outputs.
+### OBS WS Generic Request
+Makes an OBS request and sends its result through. Use if if you really know what you're doing.
+### Vector To OBS Position
+Transforms a Vector into a position vector accepted by OBS transform inputs.
+### Get Source ID
+Searches for an OBS source in a scene by name and returns its ID.
+### Scene Selector
+Provides a dropdown list of scenes in a current OBS connection. Returns the scene name selected from the dropdown.
+
+## Twitch
+Nodes for interacting with Twitch.
+### Twitch Chat Received
+Sends an output when a chat is received on the current channel.
+### Twitch Send Chat
+Sends a message to the current channel.