---
title: concepts.md
tags: mewa-user-guide
description: Mewa - Video Creator & Compositor
---

## Concepts - a sketch approach

The purpose of this article is to explain the basics of Mewa's node-graph based compositing through sketch images.

### The node-graph

Consider the node-graph below. It has 3 nodes connected with edges. The Nodes represent operations and images are the data flowing through the edges, from top to bottom. In the node-graph below the **Video** node outputs a video frame, which is then pixelated by the **Pixelate** node and finally translated by the **Move2D** node.

[(edit drawing)](https://docs.google.com/drawings/d/1nfwEwlny_lfZkSZOF0sv8RfEMEksfQpeqjE1rgJKP8o/edit?usp=sharing)

Through the node-graph interface, we can choose which node output we want to inspect.

The output of the **Video** node

[(edit drawing)](https://docs.google.com/drawings/d/1mRpwuXL9-dPcTIFP4-yzQLwq8hvkLCgX70YT5QjgyOY/edit?usp=sharing)

The output of the **Pixelate** node

[(edit drawing)](https://docs.google.com/drawings/d/1HnjZZPKGB9xCqoL1LvH3IRrt8ep9VDWPl-HjD1z0Y0s/edit?usp=sharing)

Output of **Move2D** node. (Note that the video image is moved)

[(edit drawing)](https://docs.google.com/drawings/d/170VGjPunfKmIUiacrpMpqFKl_1la1Z94TIGHGUHorRk/edit?usp=sharing)

Nodes also have parameters, shown in the parameters window.
Through the parameters window, we can change the pixelation parameter while watching the output at the **Move2D** node.

[(edit drawing)](https://docs.google.com/drawings/d/1GxROhz2fKURvcPfI20-5O19WvVUdidvmOeICUQkDsO4/edit?usp=sharing)

With a node-graph interface, we can watch the output of a selected node while modifying any parameter.

### Animating parameters

Below we have the **Move2D** node with it's parameters window open showing the scale parameters.

[(edit drawing)](https://docs.google.com/drawings/d/1TwOP7ggREIRYRzJ_9Mrz9M9i_UG4SC4bGS2E6g6fpDc/edit?usp=sharing)

[(edit drawing)](https://docs.google.com/drawings/d/1gTIw44MYDMDtkHEkIedSsYzVlqAd4i9D8RvG67hCotY/edit?usp=sharing)

To produce animations we set different parameter values at different frames/time.

The most common way to animate a parameter is by associating a curve to a parameter.

[(edit drawing)](https://docs.google.com/drawings/d/10F0M6fCBUei9wTIMYcsY10U6LwX0ua2huyJc0s85pss/edit?usp=sharing)