Presagis

Hello..

I am trying to generate large area 3D terrain using CDB elevation and Satellie imagery. I have two doubts:

1) I am able to generate good quality3D terrain in .txp and in .mft using terra-vista but issue is that when i try to render it in vega-prime, it takes around 30 secs to render and after that when i try to fly an object (which is a fighter jet in my case, having very high speed) terrain renders tile by tile so the terrain is not semaless. I have tried using different parameters but the issues are still persisting.
i changed far visibility to 125000m so that flying at very high speed should not b an issue. could anybody please suggest ideal/standard parameters for LODs, Far Visibility, texture size and block size for generating large area bulky terrain??

2) say my satellite imagery is of 1 m and m trying to make it sit over 90m elevation; how does it manage to sit over it??

any help/suggestion would be highly appreciated.
Thanks in anticipation

The attached script will set up your project to generate Metaflight with ball-park params for a high-flyer DB with 100km visibility and 1m resolution VT.
Read the instructions in the script

thanks for sharing. i will give the script a try!
is this script exclusively for 1 m VT or it can automatically manage the resolution??

Yes the script is only set up for 1m VT resolution. If you need a different resolution then you’ll need to change the LOD structure with the Polygon Calculator in TV

Okie perfect !!

in my case, i am using multiple resolution satellite imagery. most of the area is covered by 3-4 m resolution imagery. could you please tell what should be the LOD and other parameters in polygon calculator??

I have tried using different permutation-combinations but its just not working out!! as my data is very bulky, i want it to render semalessly and perfectly, no matter at what altitude my object is!
thanks

If most of your DB is 4m and you have a high-res inset of 1m, which is what I think you’re describing then you need to set up Variable LOD to have fewer LODs in the lower resolution area.
Search for “Variable LOD” in TV help, there’s a good explanation of how to implement it

Thanks John, it has been helpful but the issue remains that in. txp output bega-prime is tajing time to render the terrain for a far visibility of 120 km i can see terrain coming up block by block, even with a steady camera!!!

whereas, if i try the same thing with .mft output, no such problem is there!!! but with .mft it is taking too huge hard disk space as compared to .txp.

I am trying to generate terrain for roughly 4000km!! now, could you please suggest which output woulbe be better to go for and also that i am using ultra high end machines so my application requires not even a single secong delay in rendering

thanks a lot, John

Thanks John, it has been helpful but the issue remains that in. txp output bega-prime is tajing time to render the terrain for a far visibility of 120 km i can see terrain coming up block by block, even with a steady camera!!!

whereas, if i try the same thing with .mft output, no such problem is there!!! but with .mft it is taking too huge hard disk space as compared to .txp.

I am trying to generate terrain for roughly 4000km!! now, could you please suggest which output woulbe be better to go for and also that i am using ultra high end machines so my application requires not even a single secong delay in rendering

thanks a lot, John

Thanks John, it has been helpful but the issue remains that in. txp output bega-prime is tajing time to render the terrain for a far visibility of 120 km i can see terrain coming up block by block, even with a steady camera!!!

whereas, if i try the same thing with .mft output, no such problem is there!!! but with .mft it is taking too huge hard disk space as compared to .txp.

I am trying to generate terrain for roughly 4000km!! now, could you please suggest which output woulbe be better to go for and also that i am using ultra high end machines so my application requires not even a single secong delay in rendering

thanks a lot, John

Thanks John, it has been helpful but the issue remains that in. txp output bega-prime is tajing time to render the terrain for a far visibility of 120 km i can see terrain coming up block by block, even with a steady camera!!!

whereas, if i try the same thing with .mft output, no such problem is there!!! but with .mft it is taking too huge hard disk space as compared to .txp.

I am trying to generate terrain for roughly 4000km!! now, could you please suggest which output woulbe be better to go for and also that i am using ultra high end machines so my application requires not even a single secong delay in rendering

thanks a lot, John

I think you’ve answered your own question. If you’re building a Large Area Geo-specific terrain DB,  Metaflight is the way to go

yeah, i have shifted to mft instead of txp!!

still while rendering it in VP, i am encountering some issues. for some area it is rendering highest resolution texture, for some area coarse texture and for some region only white elevation is there!!

In terra-vista, i have given far visibility as 125kms and LOD values to higher levels which i ll not be touching while flying so i want VP to render whole 125km (which should be rendered in active preview) with highest resolution texture. is it really possible??

as i can understand, this is happening because of the parameters passed in ‘myVTVirtualTextureDataset’ option, i have just given it a wild try. i am not really aware how these parameters are to be passed.
attached snapshot has information about the parameters that i have used, could you please tell me how these parameters are to be calculated or optimum parameters for my terrain ??

Thanks again!

You could try something like this. But you may want to post on the Vega Prime Forum too.

we use the parameters
Config Dimension = 2
Tile Dimension = 1024

to properly display our clipstack built all of 512x512 tiles, and define the same for levels 0 - 5

we leave center threshold at 0

Thanks a lot to both of you. I will just try it and will also post it VP forum.

Thanks a lot to both of you. I will just try it and will also post it in VP forum.