Get polygons elevated easily?

[tompablo]

Hi, I am using FS98 with Scasm and want to know if there is an easy way to get polygons simply elevated. No mountains, just the polygon itself.

Thanks

 

[arno]

Hi,

If you give polygons a Y coordinate that specifies their elevation, so that way you can make a polygon at a certain altitude. Is that what you mean?

 

[tompablo]

Hi,

If you give polygons a Y coordinate that specifies their elevation, so that way you can make a polygon at a certain altitude. Is that what you mean?

Thanks Arno, sounds good! Could you please give an example for the Y coordinate, where it is placed?

 

[arno]

Hi,

It is hard to give a sample, it can be in different places. Most like there is a list called Points or VecPoints with the vertices to use in the poylgons. That's where the positions are defined.

 

[tompablo]

Is it possible to get elevationpoints in here? My guess are the 0 and 1200 entries, but just a guess (not from my Scasm).

Points( 0
-2495 0 -2508 ; 0
-2495 0 2519 ; 1
2505 0 2519 ; 2
2505 0 -2508 ; 3
-2495 1200 -2508 ; 4
-2495 1200 2519 ; 5
2505 1200 2519 ; 6
2505 1200 -2508 ; 7
)

 

[GaryGB]

Hello:

Certainly Arno has a lot of experience with SCASM codes.

Until he has a chance to reply again, you may wish to review the "official" SCASM online documentation:

http://www.scasm.de/doc/index.htm

http://www.scasm.de/doc/sca_s16.htm#a16


BTW: For older SCASM versions more appropriate for FS98 coding, also see documentation for Abacus scenery design program documents,



...Some other helpful tools for FS98:

http://www.simtakeoff.com/designer.htm


Hope this helps !

GaryGB

 

[arno]

Hi,

It is the second coordinate, that is either 0 or 1200 in your example that sets the elevation. So if you change that you can get your polygons at a different elevation.

 

[tompablo]

Thanks GaryGB, I have got the Scasm documentation already, but for some points I need a better explanation. They are too abstract for me.

Thanks Arno, the elevation works fine. The only problem is: the polygons get bleeding-effects
and they are floating, they don't stay at one position. We need it for an elevated airport-platform.

 

[arno]

Hi,

I guess they are drawn inside a LayerCall then now, that is for ground polygons. If they are floating now they need to be in a PerspectiveCall command instead.

 

[tompablo]

Can you help me with that? I don't know, there is already a layer call in there,
looks like it is set to 1 (see copy of my Scasm).
I don't get which is the best layer to set out of the Scasm-instruction, it needs to be lower than 24 because of the runways. There is 28 for mountains (which would be too high in my opinion).
Where should I set the PerspectiveCall? And what have I to enter there?


; LatRange( N47:51:34.30 N48:06:29.94 )
; ----------------------------------------
; ----------------------------------------
; Object # 1, offset: 0x000A size: 128 bytes (0x0080)
;; Lat: 0005162DDh Lon: 00748012Dh
; ----------------------------------------
Area( B N47:59:42.45 E010:14:21.42 40 )
LayerCall( :L000020 1 )
Jump( : )
:L000020
RefPoint( rel :L000088 1.00 N47:59:42.45 E010:14:21.42
V1= 0 V2= 0 )
Bitmap( CONCRETE.R8 0 0 0 0 )
Smoothing( 1 )
Points( 1
-14 50 45 ; 1
163 50 -20 ; 2
-147 50 -25 ; 3
)
StartSurface ; use only for polygons flat on the ground
MoveToPt( 1 ) ; use for line drawing only
DrawToPt( 2 ) ; use for line drawing only
DrawToPt( 3 ) ; use for line drawing only
EndSurface
Smoothing( 0 )
:L000088
Return
EndA

 

[arno]

Hi,

You would replace this line:

LayerCall( :L000020 1 )

With:

PerspectiveCall( :L000020 )

But this will mean your polygon will display on top of the runway. You can't have a polygon that is not on the ground layered with the runway.

 

[tompablo]

But how it comes there are several sceneries that have runways with elevated ground/polygons? Are the runways in extra-BGLs? As far as I know layers work over specific BGL.

 

[arno]

I think then the runway won't be the default runway command, but a custom made one. But it is a long time ago I made scenery for FS98, so my memory might be a bit blurry.