Seams between tiles

Ruggostein · 2012-06-21T04:58:19

I'm creating a 3d tile based game, where a level is composed of lots of small tiles 10x10 in size, that are stitched together in a big mesh during loading. The problem is, there are some visible seams between each tile, that seem to be dependent of the camera position. What could be causing this? The problem looks a lot worse when multisampling is enabled (and the problem appears on both PC and iPhone port)

Graphics and GPU Programming Programming

Started by Ruggostein March 09, 2011 03:32 PM

21 comments, last by szecs 11 years, 10 months ago

Ashaman73

13,718

June 19, 2012 06:54 PM

Somebody suggested to me that there is very little advantage to mipmapping for 2D...

Yes, when you develop a 2d game with a fix 1:1 texture mapping, you don't need mip-mapping at all, I was more or less referring the topic starter who creates a 3d game.

Ashaman

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vNeeki

194

June 19, 2012 07:21 PM

This seems to be a texture bleeding issue when linear filtering is enabled. Here are some hints/tricks to get rid of it:
1. You tiles should be of power of two size, this could prevent texture bleeding from mipmapping.
2. Try to use array textures: put each tile on a single layer (thought I don't know if the iphone supports this). Don't try to archive this with 3d textures (=>mipmapping issues)!
3. Try to clamp to the tile borders using a shader, add a small border to the tiles,but your total tile size(including border) should be still a power of 2.

May i ask if by generating mipmap levels at runtime could fix the problem as well ?

tanzanite7

1,409

June 20, 2012 11:47 PM

May i ask if by generating mipmap levels at runtime could fix the problem as well ?

The time of generation has no relevance to the problem.

szecs

2,990

June 21, 2012 04:58 AM

[quote name='vNeeki' timestamp='1340133709' post='4950686']May i ask if by generating mipmap levels at runtime could fix the problem as well ?

The time of generation has no relevance to the problem.
[/quote]
But it has. Read back. It's not the time, but the run time generation part that's relevant. Run time doesn't mean an actual time, it means that something happens when the program is running.

If you generate the mip-map levels by yourself, then you can fix the problem. Following Ashaman's advices. But with a 3rd party library (like glut), I don't think so.

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Seams between tiles

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