Pixelates the screen and overlays a mosaic tile texture onto each blocky pixel.
Note: an external texture must be attached to the Overlay Texture field for this effect to work properly. An example is provided at Resources/Textures/MosaicOverlay.png.

Parameters
- Overlay Texture - The texture to overlay on each mosaic tile.
- Overlay Color - The colour tint of the overlay texture.
- Tile Size - The pixel size of each tile in the mosaic.
- Use Point Filtering - If true, tiles will look clean-cut. If not, tiles have a ‘bloom-like’ look.