Celestia Forums

After long researches I found GIS data for fault, trench, ridge and (finally) Large Igneous Provinces (LIPs) here:

http://www.ig.utexas.edu/research/projects/lips/index.htm

This dataset has been rendered in "Location mode"; the least 3d model is an invisible fake point that allows LUATOOLS user to select the add-on for showing more data through MoreInfo (images and/or text). See the LUATOOLS help within the zip on how to.




http://www.shatters.net/forum/viewtopic.php?f=23&t=15609&p=120487#p120487

Fenerit,

why don't you make a CMOD file of these curves, instead of a bunch of dots (locations) ? It would be much better as 3D CMOD lines...

Cham wrote:Fenerit,

why don't you make a CMOD file of these curves, instead of a bunch of dots (locations) ? It would be much better as 3D CMOD lines...

That's was my first intention, because a CMOD model should have been much more fast to draw (fps) but I have had a bit of problem with the spherical geometry:

x = r cos theta * cos phi
y = r cos theta * sin phi
x = r sin theta

or

theta = lat * pi/180
phi = long * pi/180
x = - r * cos (theta) * cos (phi)
y = r * sin (theta)
z = r * cos (theta) * sin (phi)

doesn't works; also with the y<=>z swap. The model wrap the Earth, but is completely wrong. Should be a great thing whether you could make it; in the ftp site there are the dataset. Thereafter, if only, you can tell me where I'm wrong.

It should be this :

x = - r cos theta * cos phi
y = r sin theta
z = r cos theta * sin phi

and use the Orientation [90 1 0 0] (or [90 0 0 1])

Thanks Cham, I'll try soon. It's incredible: one would suppose that LOT's of equations found on the net are wrong?

EDIT LATER:
OOPs but it's the last set of equations: they doesn't works even with the Orientation directive (already tried).

It WORKS, Cham, it WORKS This conversation have spark the light on what that was my error!
The minus of x is for ALL equation! My math education required parenthesis. What head! In sumn:

theta = lat * pi/180
phi = long * pi/180
x = - (r * cos (theta) * cos (phi))
y = r * sin (theta)
z = r * cos (theta) * sin (phi)

No need of Orientation directive

Since this topic has been "compromised" i don't know whether is the case to shift it into "add-on Development" (Guckytos?...).

Cham, do not think to make the ridge, because the dataset is incomplete and your ridge model is good. So I make the rest. For what concern LIPs, being the dataset splitted in two parts which share the same sites, I'm not sure about the linestrip that on the whole are intesecting; so, either I make all by points or I make all by point and as linestrip just the most large and "famous" LIP zones. Would be useful your opinion (for please, of course).

Massimo

I think you're already on a nice start. Could you send your models, just to test them ?

Cham wrote:Massimo

I think you're already on a nice start. Could you send your models, just to test them ?

I send you tomorrow (here is 3.25 a.m!). LIPs will be in points, though. I wait a bit further for your quick reply if any, then a go asleep.

Hi Massimo,

yes, if you are reworking it to get even better, as it seems the case to me, I will transfer it to "add-on Development".

Regards,

Guckytos

Well done, Christian.