1. #1

    Default Create a 3-D relief from photo

    Hey all, I am a new z-brusher and have just gotten into the tuts. My mind is a spinning now! This is one crazy app! But looking really cool so far.



    Here is my question, would it be possible to take a good photo of a human subject and create a good quality relief type sculpture of it????



    The reason I ask is, I am a toy sculptor and model maker for the toy industry. I use Rhino, Light wave, Free form and a littel Maya for all my work in toys.

    I model the parts, sculpts or models in one of the apps I use now and all the parts are then milled on my CNC milling machine. If you would like to see some of my work check me out at www.bnt4cncrp.com



    I would like to know if there is a way to use the Alfa channels and misc. functions in zbrush to create a 3-D relief’s of say your kid and you or hub or wife type of thing. Or by using existing pictures. “ I know YA RIGHT! Ha! The model would then be milled and framed to create a 3-D picture, at least this is the concept.



    There are other apps on the market that do this type of thing BUT just dose not get it right. Maybe zbrush could do it. HUM!




    Thanks Much
    Bill B
    Last edited by Bill B; 11-24-04 at 06:56 PM.

  2. #2

    Default Wrong Web site address

    Sorry my web site is
    just typed it wrong.

  3. #3
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    Yes. That is the simple answer, always is.

    http://www.zbrushcentral.com/zbc/sho...d.php?t=021784


    Some people have also posted heads modeled from images.

    I've taken the final models and exported as OBJ then through various apps that create STLs for me that then get returned as wax models. Always nice to have your creations in your hands.
    Jason Belec
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    Wink Sure...

    Any image can make an Alpha
    You have an automatic function Make3D from an Alpha
    So...
    Pilou
    Ps For your bad adress you can Edit your post
    Is beautiful that please without concept! ( Me and maybe also E Kant)
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  5. #5

    Default How about an example

    Since I am new to zbrush I am really excited to see how this might work. Would anyone be interested in illustrating this for me with a quick screen shot of how it might work.



    Thanks

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    Bill,

    I have sent you an email through the link to send email. I did not get any confirmation that it was sent, so if you did not get it, please let me know.

    Regards,
    Chris

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    Quote Originally Posted by Bill B
    Here is my question, would it be possible to take a good photo of a human subject and create a good quality relief type sculpture of it????
    The main difficulty with this is getting the alpha that zbrush would use in the first place.

    A photograph, even b/w and not considering lighting directionality, of a person's face is not the same as the grey-scale alpha that would need to be used to recreate that face.

    ZB won't convert a photo into an alpha that can accurately reproduce a face, but if you could generate an alpha that can, then ZB would be able to use it.

  8. #8

    Default

    what i hear from your question is not really a zbrush issue. Eyetronics can take a picture with a camera that also projects a very fine grid across the surface of the object which is then used by their own software to create a 3d surface. and there are other scanning methods out there like that but zbrush will not take a photo to 3d. you would have to sculpt it from the photo and that is no different than any other program.

    looked through your site. very intersting work. I would love to pick your brain about what you do as i am very interested in rapid prototyping for my digital sculptures.

    best,

    r

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    The dream of every zbrusher : a 3d printer!

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    I've played with this and the problem is that camera's can't take what essentially needs to be z-buffer frames of the persons head.

    The best way I've found is to use it as a stencil and make the broad gradient type relief based on that(in the shape of a head) and then fill in the details with a smaller brush size or a custom created alpha from photoshop.

    The details of hair, eyes, ears, ect are all easy to map depth to in photoshop because there isn't much depth change, just small details...

    Finally using the photo as a guide, use the custom alphas to paint in the eyes, nose, ears, mouth ect in the right spots, and you have a pretty clean relief.


    Not plug and play, but doesn't take too long once you get the hang of painting the initial relief, getting the edges and flow of the mesh down.

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    You could use Poser5 to take front and side shot of the head to get the basic shape laid out and kinda looking like theperson then export the head, neck, eyes out as obj.

    import that into zb, up the subd a few times, sculpt any extra details you might need, then set the model to face you, snapshot it to the canvas then use mgzgrabber tool to grap up the screen.....it will create a depth alpha you could then use to create a 3d tool with.

    Or something like that. The thought just occured to me so havent had a chance to try it but it should work. Maybe hahaha.

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    well here's a quickie....poser5 to zbrush

    sorry i didn't have any pics front and side of someone famous so you could "see" better but should give you an idea.

    posertest3dalpha.jpg
    hopefully the crappy crunching of the pic doesn't kill how it looks too much


    the pics with red arrows indicate the alpha with various different alpha curve settings so you can see how you can make it better or worse for doing the make3d from alpha.

    Obviously the face on the right is the poser model, at about 250000 polys, I couldn't subd anymore cuz this computer is a tank. I then snapshot it to canvas, and used the grabber tool to get the alpha.

    the face on the left is the make3d result using that middle indicated alpha.

    Dont know if that helps at all but there it is.

    ps....if you have a front and side view of someone, either send it to me or post it here and I will give it a go for ya and post the results. Keep in mind it will be done quickly cuz this is my busy time of year.

  13. #13

    Default some more details

    Hey all,



    I thank you much for the input on this subject. As I suspected only in a perfect world. However based on some of the answers I’m not sure I got my point across. What I am looking to do is create a very shallow relief of the subject matter.



    Here is the scenario. I want to take an existing picture or take a new picture of your spouse and you or kids type of thing with a nice background. Bring it into zbrush and create a very shallow relief at an approximate picture size of 4x6, 8x10 with a depth of say no more than ¼ - 3/8 thick. The subject mater and background would then be processed for cnc milling of the final composition framed and bam! instant 3-D photo. Of course I want this to happen on the fly inside zb with very little Photoshop or manual manipulation of the picture. Ok stop laughing!



    I am not looking to create a full 3-D object here. The idea is to think 3-D photograph. Am I still dead in the water? Or could zb do a variation of this? In fact the final image could actually be somewhat sketchy in nature and have an artistic flare to it, almost a oil on canvas type of feel. I am not looking for extreme accuracy It may not be necessary, however the identification and likeness is key.



    So what do ya think?

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    Have you tried bringing the photo in, applying to a plane mesh and suddividing a few times and using the layer brush to add the depth, make sure you only add it in Z, not X and Y. Then make a polymesh out of that, to redistribute the polygons more evenly. In essence that would give you what you want and an OBJ can be transformed into milling machine data through various software apps. Very similar to the approach I posted with the link to matte paintings the Spaceman started.
    Jason Belec
    Kiss Your Sister Studios... YEAUCH

    Eternal Zsphere thread : 'Origins' begins... : Liquid Maya

    Jason can be reached at Cowboy Feng's Spacebar and Grill. If you know where it is, you are indeed privileged. It's your round.

    'Obey me! I am ROOT!'

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    Even as a relief, I think the same limitations would apply because the alpha generated from the photo would not give the necessary elevations to reproduce likeness. This would also be highly dependent on how the subjects were lit when they were photographed.

    As an example, say the subject was lit from the side with a bright light, one cheek would be bright in the alpha and thus raised high in the relief, whereas there would be a dark shadow on the other cheek from the nose. This shadow would be dark in the alpha and not raised much, if at all.

    Another example would be highlights; on a face the brightness of highlights is often the same on the nose, forehead, cheeks etc. These would all then be of an equal brightness in the alpha and, therefore, raised to the same extent, which clearly wouldn't be correct.

    There is some software available that will generate 3D head models from photos but I can't recall its name, although it did have the word 'face' in it. If you could find that you might get a better idea of what would be involved to accomplish what you want.

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