Cloud top value

[GudaGuda]

Hello,

I'm using P3D V6.1.11 with the lastest version FSUIPC V6 .

I'm creating one cloud layer from 3000 to 6000 ft.

When I check the cloud base (CE82) offset in FS Interrogate. I found the expected value (888m/3000ft).

But I don’t understand why the top cloud offset value (CE82) indicates 2107m(6912 ft) instead of 6000ft in P3D.

Is it expected?

Thank you for your support

Dan

[GudaGuda]

I did some more tests. This doesn't happen with Cirrus. It only happens with Cumulus.

Do I have a way to find the same value as in the  Prepar3D Weather dialogue box?

[John Dowson]

I am not familiar with the New Weather Interface so not sure I can help at the moment, although I can look into this and get back to you (and maybe ask Pete about this).
Are you writing to C800-CBFF to get the requested weather in CC00-CFFF? If so, can you show me how you are doing this.

 

[John Dowson]

On 10/6/2024 at 12:35 PM, GudaGuda said:

I did some more tests. This doesn't happen with Cirrus. It only happens with Cumulus.

I have just done some tests as well, and setting the same cloud layer at 3000ft to 6000ft I see this for cirrus:
   750719 46208 Monitor IPC:CE80 (U16) = 975
   750719 46208 Monitor IPC:CE82 (U16) = 914
   750719 46208 Monitor IPC:CE87 (U8) = 1
which changes to the following when switching to cumulus:
   822422 46208 Monitor IPC:CE80 (U16) = 2133
   822437 46208 Monitor IPC:CE87 (U8) = 9
so I am seeing a bigger difference for the cirrus which is way off...

Checking in P3Dv5 - the upper altitude for cumulus is even more out:
    73906 44992 Monitor IPC:CE80 (U16) = 3469
    73906 44992 Monitor IPC:CE82 (U16) = 914
    73906 44992 Monitor IPC:CE87 (U8) = 9

and Cirrus give the same as P3Dv6:

   212172 44992 Monitor IPC:CE80 (U16) = 975
   212172 44992 Monitor IPC:CE87 (U8) = 1

Not sure why the upper altitude mismatches the P3D value at the moment...

Update: a 3000 foot thick layer of cirrus is either not possible in reality or very highly unlikely. The cirrus layers are usually very thin. I’m not sure what P3D actually does when you tried to set such values. My logging suggests that this is being reduced by P3D, but you seem to be seeing the correct value, which is strange...
Also I think the upper altitude is calculated, not provided, so may not be a 100% match with the set value.  But I need to go through the code and look at what is being received to generate these values. As I am not familiar with this section of the code, this will take me quite a while. I will look into this further when time permits and get back to you, but this may take a while...

John

Edited October 7 by John Dowson
Update added

[GudaGuda]

Hi John, thank you for investigating this.

So it seems to be a "P3D rendering issue". I wonder if we have the same result with simConnect.

[John Dowson]

15 hours ago, GudaGuda said:

So it seems to be a "P3D rendering issue"

No, I wouldn't say that...

15 hours ago, GudaGuda said:

I wonder if we have the same result with simConnect.

The weather data is requested and received via SimConnect.

As I said, I am not that familiar with the weather interface and I will look into this further when time permits and get back to you, but this may take a while...