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Joining surfaces (tiled heightmaps)

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Hi, I am trying to join heightmaps which edges are not guaranteed to match. Essentially, I have a bunch of heightmap tiles generated differently, and want to join these together to form the entire 'planet'. At present, I have tried to join an edge along two heightmaps, A and B, by adjusting their edge points to meet halfway, and then for all points moving away from the edge, adjust proportionally to some parameter, strength. That is, if Strength=8, then the heights of the 8 vertices either side of the edge will be adjusted accordingly. For example, if A is a 2d map and the edge we're joing is at p then: for each vertice, j A

[j]+A

[j]*8/8, A

[j+1]+A

[j+1]*7/8, A

j+2]+A

[j+2]*6/8, ... , A

[j+S]+A

[j+S]*1/8. However, this creates obvious 'strech' lines along the edge. I've played around with adjusting the edge line and strength randomly (using noise also) but I am not satisfied. Another problem inherent to this method relates to joining corners, i.e. when 4 heightmaps meet. I've considered using a circular joining method here but it all seems hackish. I was wondering if anyone could direct me to some resources about this topic? I've done the google search but I'm not entirely sure what I should be searching... Would anyone else who has attempted this care to pass on some advice? Cheers, Sam

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