Dear bis...time & tides formula please :)

[Guest]

To the OFP makers,

Can you release the formulas for sunrise/sunset, moonrise/moonset and high/low tides? It would be very useful in both Map and Mission making to have this information readily available, and surely it doesn't compromise your long hard work in making OFP? This is one of the best features of OFP, and it would be nice to be able to exploit it a bit more fully and easier. Already I have seen a very nice map made for one of the larger Mods that at certain times of the year has a main town 1.5m underwater because of surge tides (nice feature though). Please please please?

Leone

[suma 8]

Here you are. Enjoy.

Tides formula:

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Code Sample </td></tr><tr><td id="CODE">

const float maxTide=5;

Vector3 sunDir = sun->SunDirection();

Vector3 moonDir = sun->MoonDirection();

Vector3 sunTide = sunDir[1]*sunDir;

Vector3 moonTide = moonDir[1]*moonDir;

float tide01 = (sunTide.Y()+moonTide.Y())*0.5;

float tideAbs =maxTide*tide01;

<span id='postcolor'>

Note: we are aware the tide formula contains a bug. Correct should be:

float tide=(fabs(sunTide.Y())+fabs(moonTide.Y())*0.5;

We did not fix this bug as it would make many older mission unplayable.

Sun & moon position formula:

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Code Sample </td></tr><tr><td id="CODE">

float latitudeCoord = world ? world->GetLatitude() : -40*H_PI/180;

Matrix3 moonOrbitAngle(MRotationZ,5*H_PI/180);

Matrix3 earthAxis=Matrix3(MRotationX,23*H_PI/180);

Matrix3 latitude(MRotationX,latitudeCoord); // -40 - Croatia, -90 - north pole

const float initMoonOnOrbitPos=0.5;

const float day=1.0/365;

const float lunarMonth=28*day;

float timeInYear = Glob.clock.GetTimeInYear();

float timeOfDay = Glob.clock.GetTimeOfDay();

float moonOnOrbitPos=initMoonOnOrbitPos+timeInYear*(1.0/lunarMonth);

Matrix3 moonOnOrbit=moonOrbitAngle*Matrix3(MRotationY,moonOnOrbitPos*(H_PI*2));

Matrix3 earthOnOrbit=Matrix3(MRotationY,timeInYear*(H_PI*2));

// note - midnight is on the point furthest from the sun

Matrix3 midnightToCurrent=Matrix3(MRotationY,timeOfDay*(H_PI*2));

// calculate sun and moon position relative to current postion

Matrix3 cameraToCosmos=earthAxis*midnightToCurrent*earthOnOrbit*latitude;

Matrix3 cosmosToCamera=cameraToCosmos.InverseRotation();

// use rotation of PI/2 to achieve this

Matrix3 normalDirection(MRotationX,-H_PI/2);

Matrix3 convert=normalDirection*cosmosToCamera;

_direction=convert*earthOnOrbit.Direction();

_moonDirection=convert*moonOnOrbit.Direction();

// reverse N-S, W-W

_direction[0]=-_direction[0];

_direction[2]=-_direction[2];

_moonDirection[0]=-_moonDirection[0];

_moonDirection[2]=-_moonDirection[2];

_direction.Normalize();

_sunDirection=_direction;

<span id='postcolor'>

[Blomstermann 0]

See... THIS is why we love BIS

[GAMEER_77 0]

I presume this is for an add-on, because i've seen nothing like this in mission editing

PEACE

[Mister Frag 0]

I understand that the default can't be changed so as not to break existing missions, but it might be nice to be able to select the corrected tide formula through a setting in the DESCRIPTION.EXT file or a trigger.

[Spitfire 0]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (GAMEER_77 @ Oct. 09 2002,20:39)</td></tr><tr><td id="QUOTE">I presume this is for an add-on, because i've seen nothing like this in mission editing  

PEACE<span id='postcolor'>

That's a piece of something top secret, called OFP source code in C++.

[IceFire 0]

Shouln't this be in "mission editing"?

[Blomstermann 0]

addon and mods would be more correctly

[Skunk Monkey 0]

Yeah,

I noticed this too with 1.75 and we have made use of it in a few of the maps we have on our server, and seen it on others. one of the easiest place to see the dramatic effect of tides is the twin little islands to the south of Nogavo. The tides can make them 1 big island joined by a sand bank or two little ones... and yes its stuff like this that makes us all love OFP and those wonderful guys at BIS

[walker 0]

Hi all

Has anyone produced tide tables for the islands in OFP?

It would be useful particlarly for use with the new LSD and forces doing an sea-bourne invasion.

Regards walker

[Kermit 0]

We worship you, Bohemia Interactive Studios people!

[Mister Frag 0]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (walker @ Oct. 09 2002,16:20)</td></tr><tr><td id="QUOTE">Hi all

Has anyone produced tide tables for the islands in OFP?

It would be useful particlarly for use with the new LSD and forces doing an sea-bourne invasion.

Regards walker<span id='postcolor'>

You'd have to know the location of the islands in order to produce the tide tables.

[Guest]

Thank you Suma....excellent stuff As someone else said....this is why we love BIS and OFP. Hopefully some clever boffin will have the calculator soon (I can barely program a VCR).

As to which forum this should be in...I did check posts...and most that were to do with tides/times were in General....so I thought when in Rome.....(it was only my first post).

From a very grateful Leone

[suma 8]

I think this belongs to mission editing.