Tilemap Problem
BlitzMax Forums/MiniB3D Module/Tilemap Problem
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| I'm not new to Blitz3D but I'm totally new to Bmax and miniB3D and I have a problem I couldn't solve myself. I wrote a small B3D program to display a tilemap using a single surface mesh and moving the tiles by moving the UV coordinates only, which is 7 times faster than DrawImageRect (in B3D). Download Example B3D + BMAX Screenshot Blitz3D  To learn Blitzmax, I ported it to minib3D and it works but there are strange 1 Pixel wide seams I can't find the origin (I already know the "patch" with GL_NEAREST but the pixel seam is still there): Screenshot BMAX 3D Mode  Using the same display routine but drawing the tile with DrawSubImageRect, everything looks fine: Screenshot BMAX 2D Mode  Any suggestions? I'm stuck. Last edited 2011 |
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| I believe it has to do with the scaling methods used in OpenGL. Try disabling mipmapping and see if that helps.... |
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| Hmm I changed Local tiletex:TTexture=LoadTexture("incbin::tiles.png",1+8) to Local tiletex:TTexture=LoadTexture("incbin::tiles.png",1) but nothing happened (incbin makes no difference here). Some more background: I load the texture, scale the texture to its dimensions (here: 128x128, contains 4x4 32x32px tiles), calculate the tile row/column to get the corresponding UV coordinates and move the UVs accordingly, which works in B3D with the same code but without seams: u=(h Mod TileColumns)*TileSize v=(h/TileRows)*TileSize VertexTexCoords surf,V0[x,y],u,v VertexTexCoords surf,V1[x,y],u+TileSize,v VertexTexCoords surf,V2[x,y],u+TileSize,v+TileSize VertexTexCoords surf,V3[x,y],u,v+TileSize |
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| I found the solution, finally. In the Function "CreateTilemap", the mesh gets positioned with an offset of 0.5 - without the offset the seams vanish :-D PositionEntity Mesh,-(ScreenX/2.0)+(TileSize/2.0),(Screeny/2.0)-(TileSize/2.0),0 |
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