1: I can’t understand at which point down the Chunked LOD pipeline that the mesh gets split into chunks. Is this during the initial mesh. Hello, I’m here to ask for help. I have program for terrain editing, but I went into one problem I can’t solve. Between each chunk is crack, how to. Hi I am trying to implement chunked lod for a while now and I am not successful so far. I read the paper about chunked lod and understood the.

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This topic is days old which is more than the day threshold we allow for new replies. Oh, sorry about I didn’t mentioned tess.

terrain – Demystifying “chunked level of detail” – Game Development Stack Exchange

Yes I divided map into tiles and then to chunks. For my needs it means I had to create the height data on a different thread as the camera gets closer to the planet, save it chunke the hard drive or SD card in case of mobile devices and load it on demand.

Posted July 21, edited. I read the paper about chunked lod and understood the main system but it doesn’t have anything about implementation.

LOD chunked rendering

Puget Sound, MB. Doing LOD for spherical terrain systems such as planets makes it even more difficult and emphasises chunksd of the cons, making them appear more pronounced than they usually would.

If you can leverage your physics chunoed to do this then by all means do so, but you really want to think about it more in terms of “distance query” than “collision”. Do whatever you want with it; no copyright, no restrictions whatsoever.


Additional advantage is the use of a geometric error estimate function which serves as a more accurate test for when to change the LOD level compared to pure distance functions.

Then you can do your GPU memory management in units of “chunks”. The preprocessed chunk file is about MB if I decimate to within a 4-meter error tolerance Hughes Hoppe’s PM demo of the same dataset to a 4-meter tolerance takes MB when it’s unzipped, see http: Note that you could also correct for the viewing angle using basic trigonometry.

The idea here is to use nested regular grids to keep high level of detail close to the camera and lower detail further away from the camera. Geometry clipmaps don’t care about the deviation, they exploit Nyquist Theorem so nobody really cares. The vertices on the edges are shared between tiles. Brilliant answer, It’s cleared up a lot of things. If vertice is bigger than 40 then recalculate it somehow?

You need x vertices per heighmap chunk in order to divide it into equal tiles 2×2 tiles of x vertices, 4×4 tiles of 65×65 vertices, etc.

The downsides include a long preprocessing phase, and some size overhead for the disk file. I have program for terrain editing, but I went into one problem I can’t solve. I’m not going to look at the code, but I suspect he’s doing something like: DLL in my path [Tcl8.

Posted July 19, The patches are expanded to 10×10 vertex grid in TS. My opinion on terrain algorithms, condensed to be as simple as possible Small organic patches: Or you can mix-and-match. Each chunk has own data for heightmap. The real world at a 10 or 30 meter sample frequency just isn’t that bumpy. There are many implementations for terrain LOD; some of which are really good.

Additional data files, hosted at SourceForge: You can build from scratch on Linux or Win It really depends on your application. I think you are over-thinking your distance determination. I have 4×4 field with class MapChunk. Sign In Sign Up. To dissapear these cracks. By contrast, most continuous LOD schemes are outdated in my opinion. Draw it on paper on 1D.


And as I mentioned before I don’t think there are any resources other than this one for chunked lod technique. A very cheap and easy option is to use the distance to the centre point of the chunk and then correct it. A final technique which I experimented with is my own idea inspired by GPU Clip Maps, using an Icosahedron with higher tessellation toward a center point which is kept oriented towards the camera.

At 16K x 16K x 16 bits, the raw heightmap data file is MB. No discrete LOD system producing static geometry is truly outdated. Yes I have no final control about mentioned vertices produced on GPU.

Level of Detail Experiments

The Puget Sound data, on the other hand, is pretty big. Meshes are progressively refined from coarsest to finest and not vice versa I wrote this hoping it would help you understand the process but I guess it’s not valueble. And as far chun,ed I know chunked lod allows you to create bigger terrains than geomipmapping and I really like games with large terrains. Chknked I looked the code he published but it was missing how he ensures every child chunk has half of maximum geometric deviation of its parent.