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i have old coin pictures as pngs or jpegs i want to turn them in to a displacement map that i can get good height to get a good rendering result.

how can i do that?

i have tryied these steps but it did not help.

How do I make a normal/displacement map when all I have is a photo?

mavigozludev
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  • how does you picture look like? Maybe try a software like CrazyBump – moonboots Jun 25 '20 at 10:32
  • similar to this https://kvmgm.ktb.gov.tr/Resim/91918,ankarasahtesikke01.png?0

    crayzbump did not work somehow it quits when i load the picture

     – mavigozludev Jun 25 '20 at 10:34
  • seems perfect for a bump map, what difficulty have you met? Do you need a fake displacement or a real displacement of your topology? – moonboots Jun 25 '20 at 10:47
  • can you check this answer? https://blender.stackexchange.com/a/174124/88382 – Sanbaldo Jun 25 '20 at 10:51
  • with the displacement node and the methods described at other blender.stackexchange page i could not get the high resolution i want. that the main problem accually. – mavigozludev Jun 25 '20 at 11:09
  • original picture https://www.cigold.com.tr/images/urunler/2-5-luk-Ziynet-Altin-Yeni-resim-2127.jpg my sample https://i.hizliresim.com/wZERKk.png

    it is not that high resolution as you can see.

     – mavigozludev Jun 25 '20 at 11:11
  • If you need a real displacement it's going to be a bit harder, my answer is just for fake 3D – moonboots Jun 25 '20 at 11:43

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Actually it is still not clear to me if you want to fake the 3D effect or if you want to really displace the topology, for example for 3D print purpose.

I don't know if you can achieve an accurate real displacement just from a b&w photo, because for this purpose you will need a picture that will precisely use black for bottom surfaces, white for peak surfaces, and all the shades of grey inbetween respecting the heights of the object surfaces, which is rarely the case with most photos.

Here is what my attempt gave from you coin picture. I chose a coin that had a better chance to give a good result: no oblique shadows, and the dark areas can be interpreted as the the bottom surface, bright areas as the peaks. As you see it is not very satisfying:

enter image description here enter image description here

So the following answer is not for real displacement, it's only to fake 3D with Normal or Bump maps, in that case it's much less important if the grey spectrum doesn't respect exactly the heights of the real object.

I gave it a bit of additional margin to make the mapping easy:

enter image description here

I created a normal map with CrazyBump (a bump would have worked as well, no big difference):

enter image description here

Then I unwrapped, mixed a Diffuse with a Glossy, plugged the original (extended) image in their Color inputs, plugged the Normal map into their Normal inputs:

enter image description here

moonboots
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  • hi did you just use blender for height maps? – mavigozludev Jun 25 '20 at 17:34
  • what do you mean? To create the normal map I've imported the coin picture into CrzayBump and convert it into a normal map (I could have converted to a bump map and use a Bump node instead of a Normal map, it's almost the same). Height map and bump map means the same thing actually, it's a b&w picture used to give (or fake) 3D. Normal map are a bit different, it works with 3 colors. – moonboots Jun 25 '20 at 17:41
  • Actually it is still not clear to me if you want to fake the 3D effect or if you want to really displace the topology, for example for 3D print purpose. In the latter case, you need very particular height map that are able to reproduce the real bumps of the object, otherwise you won't have any good result. – moonboots Jun 25 '20 at 17:43
  • i want a real displacement not fake one. like this https://youtu.be/arvhK4tvYuY?t=830

    fake displacement maps will cause problem when i start animation like rolling or falling coins with different light sourse.

     – mavigozludev Jun 25 '20 at 17:56
  • btw you did a pretty good job anyway. – mavigozludev Jun 25 '20 at 17:57
  • i should try more setting on that one i suppose https://i.hizliresim.com/wZERKk.png – mavigozludev Jun 25 '20 at 18:10
  • yes so as explained I doubt you can get anything good, I've tried with the medal with the face, which is a rather simple shape but it is still not very good :/ that said, you should consider using fake 3D + a little bit of real displacement – moonboots Jun 25 '20 at 18:11
  • by the way fake 3D means it takes the light source into account if that's what you worry about – moonboots Jun 25 '20 at 18:13