Hologram all 3D

[MANUEL_MOUSIOL]

Hello everybody,

I want to create a hologram effect on a box realistically in V-Ray. When the box or light is moving, the hologram should change and react to that.

How would you go on about that?
Please take a look at the photograph attached.


I am thinking of blending materials with colored and shaped falloff maps as masks, but havent started yet.

As always, any help and thoughts are highly appreciated!

Manuel

[Svetlozar Draganov]

Falloff maps should do the trick - here is one very basic example with gradient maps into Falloff texture ==> hologram.zip

[MANUEL_MOUSIOL]

Thanks, Svetlozar, and sorry for replying so late with a thank you at least.

I was not able to work on the hologram until today, too busy with other work.

Thank you for the max-file. I was also trying out the falloff methode, but it seems that the two layers are changing too slowly, and especially rounded corners dont seem to change in color as they would on a real hologram (even though I am just talking about how I IMAGINE it would behave, dont have an actual bend hologram here).

I will keep on trying and try some other methods that will change maps more quickly depending on viewing angle.

[mario74]

for faster changing, you can also try to modify the mix curve like steps/stairs - so not linear as default.

[MANUEL_MOUSIOL]

for faster changing, you can also try to modify the mix curve like steps/stairs - so not linear as default.

Great idea! That works very well! Thank you!

[MANUEL_MOUSIOL]

I am trying to achieve exactly something realistic like this:

http://www.youtube.com/watch?v=JxYq7TJg3pU

A hologram or holographic effect, changing depending on light and angle.

That is kind of difficult...it doesnt seem to work with the falloff shadow/light blending...

any ideas?

Also: Mixcurve in the falloff map doesnt work in RT, is that right?

[Svetlozar Draganov]

Falloff could blend two colors/maps depending on the Light position and angle - you have to choose Falloff Type: Shadow/Light



Unfortunately Falloff Map is not supported so far in VrayRT.

[MANUEL_MOUSIOL]

Yeah, I tried that, but if there are a lot of lightsources it doesnt change..It should change according to the light position I think. Is that possible?

[tashko.zashev]

Hi Manuel,

I hope you have managed to find a way to create this effect. If not, I'm sharing a suggestion, which is actually a fake one but could be a solution to this case.
What about if you use V-ray blend material with animated gradient color map as a coat layer and animated B/W map as a mask texture?

[MANUEL_MOUSIOL]

Hi Manuel,

I hope you have managed to find a way to create this effect. If not, I'm sharing a suggestion, which is actually a fake one but could be a solution to this case.
What about if you use V-ray blend material with animated gradient color map as a coat layer and animated B/W map as a mask texture?

Thanks, Tashko, for your concern and the suggestion! Much appreciated!

But I prefer a "realistic" approach, especially since I do not want to bother to animate the hologram but just be able to move the object around and have the effect.

The problem I am having with the falloff map is it doesnt seem to change in X and Y direction the same amount.
When rotating a hologram sticker you can see that the colors change according to the X and also the Y axis rotation. So lets say you turn the object to the bottom right, it would change differently than turning it just to the bottom or right.
I am having trouble achieving that effect...

[tashko.zashev]

Hi,

One solution is to write a custom shader in order to get the material react like you need.

[MANUEL_MOUSIOL]

Hi,

One solution is to write a custom shader in order to get the material react like you need.

mmmh, I dont know anything about coding at all..never was a coding guy..seems very difficult to me to get what I want...

[SolidMind]

Hi!
Did you manage to solve this? I am also in need of this and deadline is approaching to rapidly...

[MANUEL_MOUSIOL]

Sorry, I've no solution.
We ended up faking it with a painted map.
Not very satisfying

[Rens]

Hi,

Bit rushed here, but using a rainbow gradient with a falloff map as the map input to drive the reflection color should work. If you look at a hologram you see it looks like a metal, with the hologram part having very blurry reflections.
- Create a falloff map. perpendicular parallel.
- Create a gradient ramp or bercon gradient, black key, red key, green key, blue key, black key. With the bercon gradient you can have it repeat as it seems holograms repeat the gradient twice. Or set double teh amount of keys (leave black in the center).
- Plug the falloff map into the map slot of the gradient and set the gradient to mapped, this will map the rainbow colours onto the greyscale gradient of the falloff map.
- Create a mix map, plug in the gradient in col 1, set col 2 to grey and set the mix amount to about 50 depending on how you want it to look. This mixes it back to a default metal reflection.
- Create a vray meterial, diffuse low or black, plug the mix max in the reflection slot, disable fresnel, set roughness to say 0.5 or so.
- This is your hologram material.
- For the metal base create another vraymtl, very low or black diffuse, no fresnel, grey colour for relfection, glossiness higher to say 0.9.
- Now create a vray blend mat, second vraymat as the base, your hologram mat as the layer.
- You can blend using a texture if for example your hologram needs a specific shape.

Now I'm not 100% sure this is the exact physical effect; I haven't studied the little card hologram I have here long enough yet, but to have the rainbow spreading out around bright light sources instead of it spreading out from the center you can layer three metal reflection materials on top of each other (you can lower the reflection value to max 0.333 and just add them together in the blend material), each with a different glossiness value, one red, one green, one blue. You adjust the glossiness values so they spread into eachother making a rainbow (for example blue will have a glossiness value of 0.5 and green of 0.6, so blue will spread out more resulting with blue on the outside around bright reflections.
With the first example it will still only show on bright relfections as it's a reflection map, not a diffuse map. Anisotropic reflections could be worth checking out as well here.

Let me know if this helps.