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Dark GDK / Normal map

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Hawkblood
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Posted: 9th Jan 2012 01:11
I want to make normal maps from images. Does anyone know the math to do this?

I know there are converters out there, but I want to do it myself. I have looked on the internet and have only found vague articles 'about' normal mapping and plenty of converters.

The fastest code is the code never written.
_Pauli_
AGK Developer
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Posted: 9th Jan 2012 02:07 Edited at: 9th Jan 2012 02:08
You could take a look at the source code of the Irrlicht Engine (Open Source), because there is a method called "makeNormalMapTexture()" of the IVideoDriver class, which transforms a height map image to a normal map. Maybe you can get your math from there...

And I just found this GLSL code snippet from here:



Quite interesting since it performs the algorithm directly on the GPU. If you read up on GLSL you may find out what these commands do and translate it to C++.

Hawkblood
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Posted: 9th Jan 2012 20:24
Searching using your suggestions gave me procedures to use an existing normal map. I am wanting to make my own. I know it can be done because there are programs out there that can do it. I need the method for doing it.

Thanks for the input though.....

The fastest code is the code never written.
vitinho444
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Posted: 9th Jan 2012 20:56
i dont know if you want this, but i used one code in allegro that generates a map from a config file

Like you use 1 for grass, 2 for platform, 3 for metal and stuff...

if is that what you want check this tutorial:

http://www.youtube.com/watch?v=PYelV2kBJBU&list=PL62B63CC836DCB7C8&index=5&feature=plpp_video

I think you can understand it.. if you dont know some of the allegro syntax just ask i will be here to help you or at least try

C++ Medium 3.5/5
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WLGfx
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Posted: 9th Jan 2012 21:22 Edited at: 9th Jan 2012 21:22
I did see this somewhere and have just searched for ages on google for it again. It was basically the same algorithm that the GIMP normal map plugin uses and needed a little conversion to work with GDK.

I'll keep an eye on here for a solution though in the meantime...

Mental arithmetic? Me? (That's for computers) I can't subtract a fart from a plate of beans!
Warning! May contain Nuts!
Hawkblood
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Posted: 9th Jan 2012 21:41
It's the algorithm (or method) that I'm looking for.....

The fastest code is the code never written.
Brendy boy
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Posted: 9th Jan 2012 21:47
there's no need to search on google. There's a working code in dbpro's code snipet subforum, search for that

Hawkblood
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Posted: 9th Jan 2012 23:54
Ok. I looked at as many of the code snipets that had anything to do with normal/bump mapping that I can stand. Thanks for the point in the right direction though.
I remembered back in my DX days there was an old example of how to make a bump map. Here is my code. It's not doing what I want, but it's a start. I would like for someone to help me figure out what I'm doing wrong.

There's a function in it that you will need to make. FindFreeImage();
The rest will port into whatever you want to test with. I got the code from a DX example. Here is the function in it's original form:

I MUST be doing something wrong because the bump texture doesn't come out right.

The fastest code is the code never written.
Hawkblood
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Posted: 10th Jan 2012 00:37
Here is the original code (slightly converted). I get the same results. WHY???


The fastest code is the code never written.
Brendy boy
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Posted: 10th Jan 2012 00:43
Hawkblood
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Posted: 10th Jan 2012 00:58
Thanks. I'll try to adapt it to DGDK and let everyone know how it works.

The fastest code is the code never written.
Hawkblood
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Posted: 10th Jan 2012 01:24
Here it is:

That was amazingly simple! Thanks Brendy boy! I don't know why it's so hard to find in google.... I will post this exact code in the Code Snipets for others to use (considering there's not a DGDK version of it).

The fastest code is the code never written.
Benjames8
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Posted: 12th Jan 2012 22:13
Thats really cool I want to try it out.
Do you make shaders hawk blood?
One time I took the bumpy gloss shader from invidea and made it only bump then made it work with only one texture, it wasn't exactly great looking but I learned a little about shaders.
I like that shader that makes the texture look three dimensional, I can't remember what its called, but I think I'll try it with your bump code.
Btw it sucks that models need to be mapped so well for shaders to look half decent.
Hawkblood
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Posted: 12th Jan 2012 22:38
Sorry. I don't.

Parallax makes your texture look 3D. They all do to some degree, but Parallax does it the most-- it's a displacement.

I use Evolved's shaders.

The fastest code is the code never written.
Hawkblood
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Posted: 15th Jan 2012 02:20 Edited at: 15th Jan 2012 02:22
I'm still having problems making this work right. It's almost correct, but I'm doing something wrong. Here is a sample:

On the left is done by my code. On the right is the one I got from Evolved's. What am I doing wrong? I think it's the difference between "bump" and "normal". How can I fix this?

The fastest code is the code never written.

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DeadTomGC
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Posted: 15th Jan 2012 02:58 Edited at: 15th Jan 2012 03:01
What about this? http://www.smart-page.net/smartnormal/fl10.htm

Edit: Oh, you want to know how to do it, ok... well, I guess I'll learn from this.


Brendy boy
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Posted: 15th Jan 2012 03:00
i think the difference is in contrast so you'll need to find and algorithm for enhancing contrast

Hawkblood
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Posted: 15th Jan 2012 03:24
It seems to be made from a smoothed version of the original. I tried this, but it gave me no better results. I think I'll try to make a contrast enhancement proceedure and see if that works..... It will be a few days, because I have to work, but I'll post to let you know if it works.

The fastest code is the code never written.

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