Ploughed Field Material



  • Very nice! One could even add procedurals to make it look "watered" or even "dry" out the topsoil at the peaks, shading it a little lighter, perhaps?

    (Upvoted as well, 'cause we need a haven for great shader uploads and the threads that explain them! My respects to the demise of the Node Cult. :( )



  • @Glen85 How did you create that normal map from the photo, or is it generated by a texture program?



  • @matb said in Ploughed Field Material:

    @Glen85 How did you create that normal map from the photo, or is it generated by a texture program?

    PS or even GIMP, probably, can create normal maps from textures. (Especially with the NVidia plugins.) XNormal can also create normal maps from 3D objects. GIMP/Xnormal are free. There are probably several freebie small-footprint "from texture" generators out there. (I only ever use them from hi-def geometry sculpts for low-d figures.)


  • Poser Ambassadors

    @morkonan said in Ploughed Field Material:

    @matb said in Ploughed Field Material:

    @Glen85 How did you create that normal map from the photo, or is it generated by a texture program?

    PS or even GIMP, probably, can create normal maps from textures. (Especially with the NVidia plugins.) XNormal can also create normal maps from 3D objects. GIMP/Xnormal are free. There are probably several freebie small-footprint "from texture" generators out there. (I only ever use them from hi-def geometry sculpts for low-d figures.)

    And not to forget the B2M from Allegorithmic. ;)



  • @morkonan So these are never going to be as good as textures derived from 3D geometry because they're only accurate in two dimensions is that correct?


  • Poser Ambassadors

    The normals extracted from a color map are never as good as textures derived from 3D << yes

    because they're only accurate in two dimensions << no

    It's because "photo" color alone cannot indicate surface normal. Consider an M&M candy. The white lettering is always picked up in a conversion to normals, and yet there's no modulation related to the white lettering AT ALL in the original object.



  • I created it here after realising that my demo version of the software 'Crazybump' had expired. :)

    cpetry.github.io/NormalMap-Online



  • @bagginsbill said in Ploughed Field Material:

    It's because "photo" color alone cannot indicate surface normal. Consider an M&M candy. The white lettering is always picked up in a conversion to normals, and yet there's no modulation related to the white lettering AT ALL in the original object.

    Thanks but I don't understand what you mean by modulation here.



  • @matb said in Ploughed Field Material:

    Thanks but I don't understand what you mean by modulation here.

    Not proposing to answer for BB, btw.

    In short - The white lettering is only a color on the surface of the M&M. But, the conversion of that texture map to a normal map would result in those letters deforming the surface. (Just like in a Bump Map conversion.) In the construction of a 3D, geometrically-based, normal map for an M&M... (Not quite sure why anyone would, but..) this could not happen, since the normal map would truly represent the intended surface features of the object, regardless of any "texture" features.

    PS- In further news, on-topic only if one frequently makes cognitive associations like I do..., Science Daily - Substantial Evidence for Holographic Universe

    I find this exciting. An analogy - What 3D artists do on a 2D screen is somewhat analogous to what the Universe does to us every darn day - LIE! :) (I'm a Susskind fan, what can I say?) It's not quite, exactly, pushing into the "simulation argument", but it certainly deals directly with some quirks of information theory.

    Now, if we can harness this knowledge for our own uses... Welcome to the next-gen of Virtual Reality. :)


  • Poser Ambassadors

    I use Genetica 4 Studio to make asymmetrical seamless tiles and associated height and/or normal maps. I only now noticed that it can export normal maps with the Y dimension conforming to either the DivX (MikkT, for Cycles/Superfly) or OpenGL (tangent space, for Firefly) standard.
    For some materials, I can also generate height maps.
    0_1486259182073_Genetica 4 Studio - normal map options.png


  • Poser Ambassadors

    @seachnasaigh - AFAIK, inverting the Y (green) channel determines whether the normal map is in DirectX (X+Y-Z+) format or OpenGL (X+Y+Z+) format tangent space normal map (both of which Poser can use).

    MikkT is tangent basis which is not the same thing as tangent space. As far as I can gather, the tangent basis is like the instructions for encoding and decoding a tangent space map - so if the app that encodes the normal uses MikkT & Superfly decodes that map with MikkT, the result will be as expected.

    MikkT is used in a lot of apps now as the source code was provided by Mikkelsen for free. There's more info on the Blender site here too in case anyone's interested ;)

    Bottom line IMHO - if in doubt, use a height map :D


  • Poser Ambassadors

    @morkonan said in Ploughed Field Material:

    PS- In further news, on-topic only if one frequently makes cognitive associations like I do..., Science Daily - Substantial Evidence for Holographic Universe

    I find this exciting. An analogy - What 3D artists do on a 2D screen is somewhat analogous to what the Universe does to us every darn day - LIE! :) (I'm a Susskind fan, what can I say?) It's not quite, exactly, pushing into the "simulation argument", but it certainly deals directly with some quirks of information theory.

    I read the abstract of the published paper referenced in the science daily article. It seemed, as far as I could tell, to contradict the headline, but I'm not qualified to assert that in public. However, I found somebody else who is qualified and did point this out in public:

    Fake News of the Holographic Universe



  • @bagginsbill

    Aha... So, it appears that the standard "news" articles have sensationalized the actual publication articles. No doubt, due to mention of the word "hologram", which is a decent analogy, but only just that. I've read other popular articles that link a "holographic universe" with The Matrix and "Universe as a Simulation" subjects, which really doesn't have a lot to do with it.

    Tks for that link! I had just come across the original article at the time of the post, so figured it'd be an interesting "food for thought" addition. Pity it wasn't more... nutritious. :)