voxelTerrain - marching cubes, transvoxel - demo - vid - src

[qwertzui11]

thread is depricated - checkout http://www.ogre3d.org/forums/viewtopic.php?f=11&t=77978

vid:
[youtube]7xTUvElNTj4[/youtube]

Feedback:
Any feedback would be great.

Have fun
Markus

[PolyVox]

Very interesting! A number of people have requested that I implement the transvoxel algorithm into my own voxel terrain library (PolyVox). I may do this in the future, but I wonder how well the algorithm works if you want each voxel to have a material as well as a density value. It seems to me that this is a difficult problem to solve as there is no sensible way to determine which materials to use for the lower LODs. Have you considered adding multiple materials at all, or does the transvoxel algorithm provide a way to handle this?

[qwertzui11]

if u already got multiple materials at ur voxel terrain, there wont be any problems with the transvoxel algo too.
But beside it was quite easy implementing the marching cubes algo, there's a lot of code online to find for marching cubes and dividing it in parts isn't that difficult. For rendering a simple octree is enough.
For Transvoxel there're quite no resources and rendering all the lods got hard work espeacilly because they get calculated totally async and parallel.

Markus

[drwbns]

This looks awesome, I wanted to try to implement PolyVox for converting an Ogre::TerrainGroup to voxels to allow for editing but I'm failing at it. Do you have any tips on how to accomplish this? Nice work BTW!

[qwertzui11]

It's not trivial, there'd be a lot of tips ; u should intensly read Eric Lengyel’s Dissertation @ http://www.terathon.com/voxels/
u may wanna study my method part3::calculateTransvoxel(...) in the class part3:
https://github.com/qwertzui11/voxel-Ter ... /part3.cpp

Or u may wanna buy a license of the c4 engine which has an implementation of Transvoxel too; at standard license u get the src too.
https://www.terathon.com/c4engine/order.php

Markus

[qwertzui11]

whops u wrote PolyVox, not Transvoxel
I got no idea of the PolyVox lib and its ad- and disadvantages, or usage.

Markus

[drwbns]

Were you going to put the rest of the source code in the repository?

[qwertzui11]

i could; but it's just the convertion of the vector3 arrays of postions and normals and the array of triangles to a mesh.
call part3::hullVertices(), call part3::hullNormals() and part3::hullTriangles() für the geometry

Markus

[GavinL]

Are there some files missing in the repository? You seem to be including some header files that do not exist such as

blub/core/axisAlignedBox.hpp
blub/core/triangle.hpp
blub/core/hashMap.hpp
blub/core/mutex.hpp
blub/core/sharedPointer.hpp

[qwertzui11]

I didn't add them because they are "special". In my Demo hashMap simply derives from QHash (Qt), mutex derives from boost::mutex, axisAlignbedBox derives from Ogre::AxisAlignedBoundingBox.
For Platform-, Renderer- and Engine-Independency I didn't add them. U may wanna replace these Classes with ur own.
However if u just wanna get it running or get stuck at implementation; I'll post the missing core files.

Have fun
markus

[GavinL]

If you could add those files, I would really appreciate it, I'd like to get it working so I can tinker with it.

[qwertzui11]

i commited and pushed the missing core files. However they are full of dependencies, like Qt, Ogre3d, bullet or boost.

Have fun
Markus

[GavinL]

Thanks Markus!

Just a quick question. Was there any particular reason you choose to use the QT containers over the STL containers?

Also, I think you're still missing a few files: line.hpp, plane.hpp

[qwertzui11]

u r welcome

For Qt there are only historical reasons why I use them. I really should replace them with stl/boost headers However I really like the QString class, everthing else is replaceable and maybe better.

Markus

[drwbns]

Are you saying the missing files aren't needed? Or are you going to upload them also?

[qwertzui11]

Also, I think you're still missing a few files: line.hpp, plane.hpp

added them.

Yes all used core files are now pushed to the repo too.

Have fun
Markus

[weifeng021]

Thanks qwertzui11!
But there are also files missing. Such as

blub/core/file.hpp
blub/core/map.hpp
blub/core/sharedPointer.hpp
blub/graphic/material.hpp
blub/core/quadVector3.hpp

[qwertzui11]

added too.

Markus

[weifeng021]

added too.

Markus

Also

blub/core/quaternion.hpp
blub/core/vector2.hpp


And don't you provide the whole project? You are appreciated.

[qwertzui11]

added all core, graphic and physic classes. They are quite unclean.
DIDN'T add network, login, dbms, input and sound classes. There shouldn't be any deps to these classes.

Beside in physic is the bullet implementation of physics for the voxelTerrain.

Markus

[weifeng021]

added all core, graphic and physic classes. They are quite unclean.
DIDN'T add network, login, dbms, input and sound classes. There shouldn't be any deps to these classes.

Beside in physic is the bullet implementation of physics for the voxelTerrain.

Markus

Only one :

blub/gui/renderWindow.hpp


Thanks!

[qwertzui11]

done

[weifeng021]

done

what is the entrance of the project? or this project does not execute ? Or it does not generate an application?

[qwertzui11]

no it doesn't, as I said it's really "just" the lib for created a iso surface of some voxel data. Let's continue this support via PM

Markus

[qwertzui11]

changed license to WTFPL because of http://www.ogre3d.org/forums/viewtopic.php?f=13&t=69449

Markus