Isometric Engine Design issues
Author
I''ve been trying to design an isometric engine using DirectX 8, and I''ve run into a major problem. If my tiles are clustered in image files, How can I draw a single (and for that matter, a group of) isometric tile to the screen without showing the edges around it?
Use transparency channels (aka alpha channel).
png files have transparency channels. Look for libpng.
libpng
Another way to do this would be to have a mask value. This means there is one colour that will be removed when the picture is displayed. Unfortunately, this means that some edges may becomes aliased.
I think the png route will be the best.
png files have transparency channels. Look for libpng.
libpng
Another way to do this would be to have a mask value. This means there is one colour that will be removed when the picture is displayed. Unfortunately, this means that some edges may becomes aliased.
I think the png route will be the best.
To get the images out from a single file, use UV coords on your tiles.
Also to stop the edges of the tiles bleeding through use
Also to stop the edges of the tiles bleeding through use
g_pd3dDevice->SetTextureStageState( stage, D3DTSS_MAGFILTER, D3DTEXF_POINT);g_pd3dDevice->SetTextureStageState( stage, D3DTSS_MINFILTER, D3DTEXF_POINT);
Author
Ah, thank you. I''m suprised I didn''t think of that. Oh, and another question. Just for my information, what exactly is that filter and what does it do (I try to never use something without understanding it)?
Author
Thank you guys for all the help. Now I have another question: How do I set up an orthographic projection in DX8?
The perspective matrix for othographic project is:
1,0,0,0
0,1,0,0
0,0,0,0
0,0,0,1
Orthographic is effectively just one face.
The perspective matrix for oblique projection is:
1,0,0,0
0,1,0,0
l cos(a), l sin(a), 0, 0
0,0,0,1
Oblique is the slanted 3D that you get if you draw a cube on squared paper. a=the angle (45 degrees or 30 degrees depending on how you draw cubes on squared paper!) and l is the distance to the ''back'' wire.
Mark
Cornutopia Games
http://www.cornutopia.net
Bytten Independent Games Magazine
http://www.bytten.com
1,0,0,0
0,1,0,0
0,0,0,0
0,0,0,1
Orthographic is effectively just one face.
The perspective matrix for oblique projection is:
1,0,0,0
0,1,0,0
l cos(a), l sin(a), 0, 0
0,0,0,1
Oblique is the slanted 3D that you get if you draw a cube on squared paper. a=the angle (45 degrees or 30 degrees depending on how you draw cubes on squared paper!) and l is the distance to the ''back'' wire.
Mark
Cornutopia Games
http://www.cornutopia.net
Bytten Independent Games Magazine
http://www.bytten.com
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