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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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 Posted: Wed Mar 02, 2005 1:42 am Post subject: A million and one DMF loading questions... |
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Why did you guys change the ambient color to hex in the file format? How do I convert this back to RGB?
Also, were there any changes in the file format since 0.91? My files say 1.00 but the help doesn't cover that version.
Last edited by Daaark on Sat Mar 05, 2005 2:41 am; edited 1 time in total |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Wed Mar 02, 2005 7:03 am Post subject: |
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 I ask the ambient question because I'm writing a DMF loader in C++. I have no clue how to extract the 3 color floats I need.  |
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Paul-Jan
Site Admin
Joined: 08 Aug 2004
Posts: 3066
Location: Lage Zwaluwe
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| Posted: Wed Mar 02, 2005 9:11 am Post subject: |
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*lol* It is the hex version of the integer-representation of the color.
So step by step:
1. Split the number up in 2-character 'bytes' for A, B, G and R
2. Convert hex to int
3. floatvalue = value / 255;
Or
1. Convert hex to int
2. R = number and $000000FF, G = number and $0000FF00, B = number and $00FF0000
3. floatvalue = value / 255
The reason why is because it is a standard encoding, and we use it for the texturelayer-color as well. We wanted to encode both colors the same way, so we had to make a choise. Converting an integer-color to floats seemed more contra-intuitive than the other way around, as the extra precision you get from a float as spurious anyway. |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Wed Mar 02, 2005 4:44 pm Post subject: |
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| Don't you mean / 256 ? |
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Paul-Jan
Site Admin
Joined: 08 Aug 2004
Posts: 3066
Location: Lage Zwaluwe
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| Posted: Wed Mar 02, 2005 6:23 pm Post subject: |
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Nope, to map an integer range [0-255] to the float range [0-1] (mind the square brackets: range inclusive), you have to divide by 255.
Otherwise you'll never get those bright-and-shiny colors you know  |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Wed Mar 02, 2005 6:30 pm Post subject: |
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To convert hex to int I you do what exactly?  (I never touch hex.. I ignore it's existance)...
Also, why is alpha included? Why would someone use an alpha value for an ambient color? Makes no sense... I guess you just leave it there for future use (Whatever that might be...) Or failing that, so it loads into a 32bit colour. |
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Paul-Jan
Site Admin
Joined: 08 Aug 2004
Posts: 3066
Location: Lage Zwaluwe
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| Posted: Wed Mar 02, 2005 6:46 pm Post subject: |
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Heck, even my basic is better than my C, but I am guessing a sscanf would do the job, wouldn't it? There probably is a better way, but I wouldn't know 
About the alpha-value, you guessed right, no we don't use it at all, and it's not likely we ever will, but we just store colors as 32bits number by default. |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Wed Mar 02, 2005 6:52 pm Post subject: |
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It will always be 8 chatacters, 2 for each component? 
I'm doing this... I know atof is wrong.. I'm trying to google for how to convert the hex string to an int... no luck so far.
| Code: |
//grab the ambient color
//and convert the hex value back
//to 3 floats
fMap.get(ca,2); //alpha
fMap.get(ca,2); //r
m_LightAmbient[0] = float(atof(ca)) /255;
fMap.get(ca,2); //g
m_LightAmbient[1] = float(atof(ca)) /255;
fMap.get(ca,2); //b
m_LightAmbient[2] = float(atof(ca)) /255;
fMap.get(ca,256,';'); |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Wed Mar 02, 2005 8:38 pm Post subject: |
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I have a material that I clicked on in the sidebar, and was never actually applied to any object tat was saved out with my map. I misclicked on the [<] button, and ended up in nature, with the water texture selected. It's not part of any object on the map.
Shouldn't that be removed on save? |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Thu Mar 03, 2005 8:50 pm Post subject: |
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I just made a test dmf to use with my loader. I made one cube, and saved, and all these materials were saved out with it.
| Code: |
DeleD Map File;
Version 1.0;
no-name-yet;00FFFFFF;75;
16;
0;system;System;0;1;0,System\system.bmp,1;
1;Floor02;Floors;0;1;0,Floors\Floor02.jpg,1;
2;Floor04;Floors;0;1;0,Floors\Floor04.jpg,1;
3;Floor10;Floors;0;1;0,Floors\Floor10.jpg,1;
4;Floor11;Floors;0;1;0,Floors\Floor11.jpg,1;
5;Water01;Nature;0;1;0,Nature\Water01.jpg,1;
6;Roof03;Roofs;0;1;0,Roofs\Roof03.jpg,1;
7;Roof04;Roofs;0;1;0,Roofs\Roof04.jpg,1;
8;Wall01;Walls;0;1;0,Walls\Wall01.jpg,1;
9;Wall02;Walls;0;1;0,Walls\Wall02.jpg,1;
10;Wall06;Walls;0;1;0,Walls\Wall06.jpg,1;
11;Wall10;Walls;0;1;0,Walls\Wall10.jpg,1;
12;Wall11;Walls;0;1;0,Walls\Wall11.jpg,1;
13;Wall12;Walls;0;1;0,Walls\Wall12.jpg,1;
14;Wood01;Wood;0;1;0,Wood\Wood01.jpg,1;
15;Wood02;Wood;0;1;0,Wood\Wood02.jpg,1;
1;
cube1;1;1;-1;1;-1;-1;User info;
14;
32;-32;32;
-32;-32;32;
-32;-32;-32;
32;-32;-32;
32;32;32;
-32;32;32;
-32;32;-32;
32;32;-32;
0;0;32;
-32;0;0;
0;0;-32;
32;0;0;
0;-32;0;
0;32;0;
24;
3;0;8;0;1;0.0000;0.0000;0.2500;-0.2500;-0.2500;-0.2500;
3;0;8;1;5;0.0000;0.0000;-0.2500;-0.2500;-0.2500;0.2500;
3;0;8;5;4;0.0000;0.0000;-0.2500;0.2500;0.2500;0.2500;
3;0;8;4;0;0.0000;0.0000;0.2500;0.2500;0.2500;-0.2500;
3;0;9;1;2;0.0000;0.0000;0.2500;-0.2500;-0.2500;-0.2500;
3;0;9;2;6;0.0000;0.0000;-0.2500;-0.2500;-0.2500;0.2500;
3;0;9;6;5;0.0000;0.0000;-0.2500;0.2500;0.2500;0.2500;
3;0;9;5;1;0.0000;0.0000;0.2500;0.2500;0.2500;-0.2500;
3;0;10;2;3;0.0000;0.0000;-0.2500;-0.2500;0.2500;-0.2500;
3;0;10;3;7;0.0000;0.0000;0.2500;-0.2500;0.2500;0.2500;
3;0;10;7;6;0.0000;0.0000;0.2500;0.2500;-0.2500;0.2500;
3;0;10;6;2;0.0000;0.0000;-0.2500;0.2500;-0.2500;-0.2500;
3;0;11;3;0;0.0000;0.0000;-0.2500;-0.2500;0.2500;-0.2500;
3;0;11;0;4;0.0000;0.0000;0.2500;-0.2500;0.2500;0.2500;
3;0;11;4;7;0.0000;0.0000;0.2500;0.2500;-0.2500;0.2500;
3;0;11;7;3;0.0000;0.0000;-0.2500;0.2500;-0.2500;-0.2500;
3;0;12;3;2;0.0000;0.0000;0.2500;-0.2500;-0.2500;-0.2500;
3;0;12;2;1;0.0000;0.0000;-0.2500;-0.2500;-0.2500;0.2500;
3;0;12;1;0;0.0000;0.0000;-0.2500;0.2500;0.2500;0.2500;
3;0;12;0;3;0.0000;0.0000;0.2500;0.2500;0.2500;-0.2500;
3;0;13;4;5;0.0000;0.0000;0.2500;0.2500;-0.2500;0.2500;
3;0;13;5;6;0.0000;0.0000;-0.2500;0.2500;-0.2500;-0.2500;
3;0;13;6;7;0.0000;0.0000;-0.2500;-0.2500;0.2500;-0.2500;
3;0;13;7;4;0.0000;0.0000;0.2500;-0.2500;0.2500;0.2500;
0; |
I never even touched the material editor thing, or the sidebar. I just drew a cube and saved. |
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Jeroen
Site Admin
Joined: 07 Aug 2004
Posts: 5332
Location: The Netherlands
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| Posted: Thu Mar 03, 2005 8:57 pm Post subject: |
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| That is correct behaviour. DeleD loads a default material list (.DML) when starting a new scene. This is convinient because you then have a set of materials you can work with right away. When saving your new map, these materials are all copied to the DMF so the DMF is a totally selfsupporting fileformat (the scene doesn't require the standard DML). |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Sat Mar 05, 2005 2:06 am Post subject: |
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strtoul is the way to go!
okay, finally found out what to do... between this, and headache of using fstream I'm fed up already.
| Code: |
//grab the ambient color and convert the hex
//value back to 3 floats
fMap.get(ca,3); //alpha -- unused
fMap.get(ca,3); //red
m_LightAmbient[0] = ((float)strtoul(ca,NULL,16)/255);
fMap.get(ca,3); //green
m_LightAmbient[1] = ((float)strtoul(ca,NULL,16)/255);
fMap.get(ca,3); //blue
m_LightAmbient[2] = ((float)strtoul(ca,NULL,16)/255);
fMap.get(ca,256,';');
fMap.get(c);
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Sat Mar 05, 2005 2:39 am Post subject: |
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| Why is it that you switch from a semi-colon to a coma half way through the material listings? |
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Paul-Jan
Site Admin
Joined: 08 Aug 2004
Posts: 3066
Location: Lage Zwaluwe
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| Posted: Sat Mar 05, 2005 8:26 am Post subject: |
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Semi-colon seperates items, coma (comma?) separates sub-items.
So the layers are separated by a semi-colon, the individual characteristics of a single layer a separated by coma's. It's a new concept Jeroen introduced with the materials, and I think he is right: it _does_ make things easier to read. For a human that is (which is the whole point of having a text-based file format). My parsing algorithm couldn't care less |
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Sat Mar 05, 2005 8:47 am Post subject: |
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I wish I would have realized that before I coded the whole thing using ';'s lol. *back to square one* took me a good long time to see that it was comas there lol. Also that and the '\' characters becoming escape sequences when I was printing out stuff for debug purposes.
My parsing code is the stuff of nightmares. There has to be an easier way! |
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