How to work with roads and 3d DEM / How to deal with 3d road?

[HUYNH Nghi]

Dear all,

I am playing with a 3d model, in which i have a DEM drawn as 3D grid, some buildings, and some roads. The fact is 3D geometry works well with DEM but it overlaps the roads as you can see in sshot. I wonder how to bend the road to adapt with the DEM ground or do we have any solutions to deal with this problem (i think there is some notion like 3d roads, 3d GIS?).

Thank you in advance.

Cheers.

7

[Arnaud Grignard]

Hi Nghi,

That look great. I see the problem, not sure exactly how to solve it but for instance you could add a z to the road (maybe by asking what is the z value of the overlapping cell of the road). 

If you want to share the code I can have a look.

Arnaud

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[Patrick Taillandier]

Hi,

Indeed, we have no solution to make a geometry (polyline/polygon) follows a 3D triangulated DEM. It can be interesting one day to have this type of feature (I don't know if jogl could help us with this).

For your specific case, you can use a trick: use the grid to decompose the geometry of the road in subsegments, and compute for each point of the subsegment the z value according to the z value of the corresponding cell + an offset (to be sure that the road is above the cell).

Cheers,

Patrick 

[Huynh Quang Nghi 002628]

Thank you Arnaud and Patrick. Ok i just want to verify my knowledge. I tested to add_z to each point of roads but 2D goto of moving skill did not work. I did not try with moving3D, so hoping that this trick can work.

The model is a toy model , i uploaded on github if you want to check it out.

https://github.com/hqnghi88/CanThoInnon.git

Cheers.

-------

HUYNH Quang-Nghi

Ph.D.

Lecturer

GAMA http://gama-platform.org/

College of Information and Communication Technology - Can Tho University

Campus II, 3/2 street, Ninh Kieu district

Can Tho city, Vietnam

[Vietnam] +84909128322

[Arnaud Grignard]

Hi Nghi,

This model looks very promising! 

Did you solve your problem of Z ? 

I am starting to write some dedicated issue on your github also, to see how to push forward this model

Arnaud

[Huynh Quang Nghi 002628]

Hello Arnaud,

No not yet, i tested to intersect the road with dem but it fail. However i will have motivation to deal with real 3d environment for gama.