I've been working on this for about 2 days now. My iso engine is rendering tiles that are 2:1 (46x23) from Left to Right and Top to Bottom. The render looks fine until I start moving about. The map doesn't wrap around correctly. I'm trying to wrap it along both axis so the map seems like the world is round. The Y Axis wrap is beautiful. However the X axis is.... another story... if I cross it from (0,0) to (99, 0) (the otherside) it puts me on tile number 9999 (which I should be on tile 99) (y*MaxX)+x (0*100)+99 = 99. I've got a screenshot of the render and each tile has it's number in the map array on top of it. maybe someone can help me... http://www.jo-solutions.com/shot.gif It's basically if you take notebook paper and wrap it around so the lines touch and run endlessly around... then shift the lines either up or down a row and it's like a candy cane's stripe... that I think is the issue. My render code.... (using SDL) I can't really paste the code here... it formats weird... but I'll try int BaseWidth = mTiles.GetWidth(); int BaseHeight = mTiles.GetHeight(); int MapX = mMap.GetXDim(); int MapY = mMap.GetYDim(); int thing = sizeof(mMap.mMap); for(int layer=0;layer < mMap.GetZDim();layer++) { //Let's get to our start location... //The camera is in the center... we've got to find the Top Left cell. int StartY = mCam.GetCamPos().y-CamOffsetY; int StartX = mCam.GetCamPos().x-CamOffsetX; CellCounter = (((StartY)*MapX)+(StartX))*(layer+1); tmpY=0; tmpY -= BaseHeight/2; //Screen coords tmpX= 0; IsOdd = mCam.IsOdd(); for(int y=0;y < MapY;y++) { if(IsOdd) { tmpX-=BaseWidth/2; IsOdd=false; } else IsOdd=true; for(int x=0; x < MapX; x++) { //Scroll the map around... if(CellCounter>=(MapX*MapY)*(layer+1)) { CellCounter-=(MapX*MapY)*(layer+1); } if(CellCounter<0) { CellCounter+=(MapX*MapY)*(layer+1); } if(x<mCam.GetXView() && y<mCam.GetYView() && mMap.mMap[CellCounter].mTile > 0) { int YOffset=mTiles.GetHeight(mMap.mMap[CellCounter].mTile) - BaseWidth/2; int LayerOffset=mMap.mMap[CellCounter].mHeight*BaseHeight; TileDest.x = tmpX; TileDest.y = tmpY-YOffset-LayerOffset; TileSource.x=0; TileSource.y=0; TileSource.w=BaseWidth; TileSource.h=mTiles.GetHeight(mMap.mMap[CellCounter].mTile); //So there aren't poky corners... if(x==mCam.GetXView()-1) { if(IsOdd) TileSource.w -= BaseWidth/2; } if(y==mCam.GetYView()-1) { TileSource.h -= BaseHeight/2; } SDL_BlitSurface(mTiles.GetTile(mMap.mMap[CellCounter].mTile), &TileSource, mScreen, &TileDest); drawString(mScreen, mSplashFont, tmpX, tmpY, "%d", CellCounter); } CellCounter++; tmpX+=BaseWidth; } tmpX=0; tmpY+=BaseHeight/2; } } Thanks Jaye

Fixed it! instead of wrappnig CellCounter I wrap StartX and StartY before sending them to CellCounter. I increment StartX and Y in their appropriate loops and set CellCounter once every X loop to the new X Y... it wokrs perfectly!