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  Can anyone help me understand these texture coordinates?  (Read 610 times)
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Offline Addictman

Senior Duke


Medals: 3
Projects: 1


Java games rock!


« Posted 2011-09-20 12:53:53 »

Hi.

Imagine a very basic Texture atlas, looking roughly like this: (A and B are the 2 different pieces).

AAB
AA

Now, judging from this, piece A can be found at
1  
[ left: 0.0f, bottom: 0.0f, right: 0.66667f, top: 1.0f ]

I have always imagined, and was sure that piece B could be found at
1  
[ left: 0.66667f, bottom: 0.5f, right: 1.0f, top: 1.0f ]


However, that's not coming out right at all. Piece B IS coming out right at
1  
[ left: 0.66667f, bottom: 0.0f, right: 1.0f, top: 0.5f ]
however.

I render as triangles, and my data for rendering B looks like this:

Vertexbuffer
1  
2  
3  
4  
5  
6  
float[] {
                       x - 64, y + 64, // top left
             x - 64, y - 64, // bottom left
             x + 64, y - 64, // bottom right
                       x + 64, y + 64 // top right
                  }


Texturebuffer (doesnt work, but what I thought was correct)
1  
2  
3  
4  
5  
6  
float[] {
                       0.66667f, 1.0f,
             0.66667f, 0.5f,
             1.0f,0.5f,
             1.0f,1.0f
                   }


Texturebuffer (works, but what I thought was wrong)
1  
2  
3  
4  
5  
6  
float[] { 
                       0.66667f, 0.5f,
             0.66667f, 0.0f,
             1.0f,0.0f,
             1.0f,0.5f
                   }


I hope my question is understandable, and that someone can explain to me what's going on here.
Offline Addictman

Senior Duke


Medals: 3
Projects: 1


Java games rock!


« Reply #1 - Posted 2011-09-20 13:11:40 »

Ok, I should have tried this first of course, rendering the entire Atlas... The entire texture is flipped vertically, so that explains the weird texture coordinates.
Offline theagentd
« Reply #2 - Posted 2011-09-20 17:06:30 »

Ok, I should have tried this first of course, rendering the entire Atlas... The entire texture is flipped vertically, so that explains the weird texture coordinates.
I was just going to say that. xD

Myomyomyo.
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