Invisible Materials

[dal-n-pok]

There are two main types of invisible material in LBP2- those that can hold a decoration, and those that cannot.
DECO INVISIBLE MATERIALS:
-After some glitching, you can harvest invisible versions of glass, stone and metal from various Story objects, such as the hammer. You can get samples from the lvl "Invisible Selectable Materials" by BOSSYCUBEFARM)
-You can also create a form of invisible material using the Sticker or Holo Material by glitching it. It will change the properties of the sticker/holo material - Sackboy will be able to run through it, but it will have weight and interact with any other materials/objects as if it were solid. In Create Mode, take a square of Sticker/holo Material and place an Unprotected Brain on it while in "Play"mode. Destroy the brain, then immediately go into "Pause" mode. (L3)Copy the square, then un-pause. The original piece will self-destruct. You will be unable to capture the material after it has been glitched like this, but you can (L3) copy it within in the level. 0% Opacity = Invisible
-"Master Material Vault: Vault of Hidden and Glitched Materials" by JACOBJIMMY is a level you can copy which has samples of invisible materials in it, although none of them will hold a decoration. However, there IS a material in the level called "Return To Pod" Message Material. It is a green material on the right ledge, fifth in. This material can be captured. Place this material and change it to Sticker or Holo Material. It turns the sticker/holo material on 100% Brightness, 0% Opacity - it will show a sticker at full brightness or stay invisible, but the percentages cannot be altered. You can then glitch this material further if you wish, or combine it with non-deco invisible materials so that you can decorate them. (The annoying "Return to Pod" message will pop up occasionally; I'm still trying to find a way to turn that off.)
-"Akuma and Nero-Angelo's invisible sticker" by AKUMA_DARK_KING contains an Invisible Sticker. If you place this on Sticker Material (doesn't work on Holo) BEFORE you use any other stickers, it will turn the Sticker material permanently invisible. Once placed, there is no way to remove this sticker.

NON-DECO INVISIBLE MATERIALS:
-See "How To Make ANY Material Invisible (Tutorial)" by BADLITTLESACKBOY (You can combine any of the materials you create with the tool from this lvl with Sticker Material to create material which can hold a decoration.)
-Use the original Dark Matter method.

[Deurklink1]

It might be smart to explain the dark matter method, for people who don't know how to use it

[Ben21]

I always use dark matter when building invisible boundary walls for certain cliffs. Plus i don't like to glitch cz of various reasons. But to do the dark matter method or how i do it is turn off my grids shrink the dark matter as small as it can go then slowly drag my analog stick straight down causing an invisible wall that is not able to walk through. BE CAREFUL NOT TO MAKE ANY TURNS/CORNERS ALWAYS make it a straight vertical or horizontal piece otherwise the wall will no longer be invisible but if you do want a corner to make a room of invisible walls make one piece of horizontal and one vertical piece of equal length then glue the two pieces together then shazam you have half of the square then copy the figure then flip it and glue it to the other have then you have a full square. Only issue is being able to select it you have to remember where it is placed then use the popit grid selection then roll over the box then you can move it.

[peoriaspitfire•]

If you want to easily be able to select your invisible boundaries or objects without having to guess, I recommend gluing a chunk of transparent holo or sticker that’s been colored to it.