Holographic Materials

[Hageta]

There are some stickers, cloths and possibly other things, that have an holographic effect.
One such example would be the invisibility cloak from Harry Potter. How are these cases handled currently?

[Orion Pobursky]

The best practice would be like what we did for the temperature changing sticker and do multiple states with a "-fN" suffix.

[Hageta]

The best practice would be like what we did for the temperature changing sticker and do multiple states with a "-fN" suffix.

What is the sticker you mentioned?

[Chris Böhnke]

The thermo sticker is here:
https://library.ldraw.org/parts/sticker-sheets/13648

Other existing holo-foil stickers are for example:
https://library.ldraw.org/parts/1075 (Simple Glitter effect, but plain silver used instead)
https://library.ldraw.org/parts/43561 (Same Glitter effect, with texmap)
https://library.ldraw.org/parts/1141 (Triangles, colored individually)
https://library.ldraw.org/parts/49954 (Complex hologram image, with texmap)

As you can see, there's no definitive standard at the moment.

[Hageta]

The thermo sticker is here:
https://library.ldraw.org/parts/sticker-sheets/13648

Other existing holo-foil stickers are for example:
https://library.ldraw.org/parts/1075 (Simple Glitter effect, but plain silver used instead)
https://library.ldraw.org/parts/43561 (Same Glitter effect, with texmap)
https://library.ldraw.org/parts/1141 (Triangles, colored individually)
https://library.ldraw.org/parts/49954 (Complex hologram image, with texmap)

As you can see, there's no definitive standard at the moment.

I think something like the triangle example would at least work with most programs.