View source for Skyblock Screenshot Compositing

Screenshots for skyblock mods tend to be better when manually composited:

* Skyblocks themselves are better shown at narrow FOV (zoomed in) while the skybox is better at a wide angle
* Compositing multiple layers allows showing off what's inside the block

Here is the method Warr1024 uses to make a complex composite shot of the `nc_sky_ultra_hard` mod:

# Create a new NodeCore world w/ singlenode mapgen
# Select Mods, enable nc_sky_ultra_hard, enable worldedit, Save
# Create worldmods dir in world dir
# Copy or link docs/screenshot-world/worldmods/mockplayer/ from NodeCore repo into worldmods
# Start Game
# /grantme all
# Find a camera position where you can see nothing but the skybox, and at an angle that shows off as much of it as possible
# Turn off HUD and chat, go fullscreen if possible
# Take a screenshot
# Quit the game
# Create a new folder named "sky" in worldmods
# Add a mod.conf to new folder, add contents:
  <pre>
	name = sky
	depends = nc_api_all
  </pre>
# <li value=13> Add an init.lua to new folder, add contents:
  <pre>
	nodecore.register_playerstep({
		label = "skyrealm skybox",
		priority = -1000,
		action = function(_, data)
			local t = "[combine:1x1^[noalpha^[colorize:#ff00ff"
			data.sky.textures = {t,t,t,t,t,t}
		end})
  </pre>
# <li value=14> Make sure waving plants shader is disabled
# Start Game
# Stand on the corner of the block, execute "/spawnentity mockplayer:ent"
# Use /giveme commands to arrange an inventory for the mock player.  An adze, loose leaves, eggcorn makes sense.
# Sneak+punch the mock player to set their inventory.
# Fly to a spot in the direction you want the mock player to face, and punch them until they face you and are in the right pose.
# Choose a part of the island to cut away that will be visible from your intended camera position but does not have the player standing on it, use worldedit commands (//1 and //2) to select the area.
# Use //shift y 1000 to move the selection box out of camera shot.
# Choose a camera position, use the Zoom key to check it.
# Turn off HUD and chat, go fullscreen if possible
# From now on do NOT move the camera at all
# Holding zoom button, take a screenshot
# Issue command "//shift y -1000" to restore selection area
# Make sure stasis is on via command "/stasis on"
# Carve island away using "//set air"
# Remove selection box with "//reset"
# Holding zoom button, take a screenshot
# Quit game
# Start up GIMP
# Open as Layers, pick all 3 screenshots
# Order layers with skybox on bottom, cutaway in middle, full island on top
# For each non-skybox layer, Layer -> Transparency -> Add Alpha channel
# Choose the Select by Color Tool
# In Tool Options, set tolerance to zero
# For each non-skybox layer, select the magenta sky and delete it
# Set opacity of topmost layer; 50% to 75% works well
# Merge and export the final composite screenshot