[x3d-public] Geo Contour plot in 3 or more dimensions.

doug sanden highaspirations at hotmail.com
Thu Aug 4 05:22:44 PDT 2016


J,
By 4D you mean time?
Lets say you have grid values as a function of time as input. 
On each tick you could re-contour the grid.
But what do you mean by contour?
An easy way would be color. Just color each grid point as a function of Temperature. 
Or color each grid face as a blend of 4 grid points.
If by contour you mean contour line, or faceset trimmed to a polyline, then you would re-contour the grid on each tick.
To contour, you start some how. Set a temperature level you want to see a contour for, and iterate over all grid cell edges until you find an edge that intersects the temperature level. 
Interpolate along that edge to get the intersection in geo lat, long. Then keeping the high side to your right to go clockwise around the temperature hill, you investigate the other sides of the starting grid cell to see where to exit the grid cell -one of the other 3 sides must intersect the temperature level. And when you find that side, then you also found the adjacent cell to do next. Keep going till you get back to the starting cell. Then look for more. ...
-D 


________________________________________
From: x3d-public <x3d-public-bounces at web3d.org> on behalf of John Carlson <yottzumm at gmail.com>
Sent: August 4, 2016 5:35 AM
To: X3D Graphics public mailing list
Subject: [x3d-public] Geo Contour plot in 3 or more dimensions.

Does anyone know how to do a geo contour plot of the whole earth in 4 dimensions?  Temperature over time world wide for example.

Thanks,

John




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