bump mapping

[rich2005]

Bottom line:

Quote:The dds file I sent you was the original as from the aircraft texture folder.

If that is the only file you have, then the details are missing. Look again at https://i.imgur.com/tljyDPX.jpg That is a texture folder with base images and detail images.

The best you will get from a single image is as described before https://www.gimp-forum.net/Thread-bump-m...85#pid9285

To get just the details and exclude all that camouflage overlay which makes the bump map look like some uneven field is difficult. You can make some adjustments to reduce the background but extracting the rivets and panel seams from top of the wings is near impossible. Looks horrible.

[mholder]

Bump mapping a texture like this requires a few things that need to be separated:
   

(1) a black and white height map
(2) a base texture
(3) colors for overlays, and can include markings, etc.

(4) You need to bumpmap the base texture (2) with the height map (1)
(5) color information is overlaid.

(6) If you bumpmap a composite image, like you have, you get something less than ideal.

The image you posted is a composite.  If you can contact the author, perhaps he can give you the original files, with the different elements separated.

If that is not available, the best thing to do is to re-make the texture from the beginning.

[jaca44]

Well that seems different from Rich2005's ideas in post $4 which seem to produce a nice bump map. Others also do it on given texture files. My problem is probably more to do with my Gimp skills in that I am not following post $4's steps correctly somehow.

[rich2005]

(07-11-2018, 03:22 PM)jaca44 Wrote: Well that seems different from Rich2005's ideas in post $4 which seem to produce a nice bump map. Others also do it on given texture files. My problem is probably more to do with my Gimp skills in that I am not following post $4's steps correctly somehow.

Just lack of understanding and what I wrote can be misconstrued

quote..Using the Gimp dds plugin gets
1. A main surface image: https://i.imgur.com/DcSkJRY.jpg
2. Some sort of semi-transparent texture overlay image: https://i.imgur.com/EARBI0u.jpg ...unquote

This is not from the single .dds image. They are separate .dds images that should be provided in the model package.

If you only have a single dds image then you will have to reconstruct a suitable bumpmap (just the rivets and seams) to use. Not easy for a beginner, very tedious once you get some experience.

[jaca44]

Well as it happens, there is a second dds image as most textures, besides the XXX_t,dds also have a XXX_s.dds as below. Any use?

http://www.mediafire.com/file/4x7gafkkj2...s.rar/file

[rich2005]

No use.
It is a grey-scale png version of your original coloured image, including all the cloudy-camouflage that is the problem.

edit: you need something like this pair of dds: https://www.dropbox.com/s/xdrw3t8oik4zhu...s.zip?dl=0

[jaca44]

(07-11-2018, 04:43 PM)rich2005 Wrote: No use.
It is a grey-scale png version of your original coloured image, including all the cloudy-camouflage that is the problem.

edit: you need something like this pair of dds: https://www.dropbox.com/s/xdrw3t8oik4zhu...s.zip?dl=0

Well looks like the hard way is necessary!

[mholder]

(07-11-2018, 03:22 PM)jaca44 Wrote: Well that seems different from Rich2005's ideas in post $4 which seem to produce a nice bump map. Others also do it on given texture files. My problem is probably more to do with my Gimp skills in that I am not following post $4's steps correctly somehow.

He is doing the same thing almost, but instead of using a black and white height map, it looks like he is using a normal map.  It appears to work in this case as a height map.

Gimp's bump map plugin only reads the luminosity values, so it reads the normal map as if it is a black and white height map.

Here it is scaled down and grayscale:
   
But it is not height map, if you notice the shading

[jaca44]

(07-11-2018, 08:02 PM)mholder Wrote:

(07-11-2018, 03:22 PM)jaca44 Wrote: Well that seems different from Rich2005's ideas in post $4 which seem to produce a nice bump map. Others also do it on given texture files. My problem is probably more to do with my Gimp skills in that I am not following post $4's steps correctly somehow.

He is doing the same thing almost, but instead of using a black and white height map, it looks like he is using a normal map.  It appears to work in this case as a height map.

Gimp's bump map plugin only reads the luminosity values, so it reads the normal map as if it is a black and white height map.

Here it is scaled down and grayscale:

But it is not height map, if you notice the shading

I see; so as the texture in any case is applied over a 3D aircraft, the parts which seemed to be raised are probably already raised on the aircraft. Really what I need are the rivets (up) and panel joins (down), so I am busy now erasing all but these!