making object ignore clipping distance

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Sephnroth

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Joined: 10th Oct 2002

Location: United Kingdom

Posted: 13th Jul 2005 13:18

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hi, I have encountered a most troublesome situation where I wish to have a strict clipping distance which clips all objects at a certain range EXCEPT for one object which must always be shown and never clipped. Is there anyway I can do that?

For the record, the object in question has its z-write disabled because it also must be behind all objects on screen no matter what. Originally this is all that was required, but i added a clipping distance option to the graphics options for people who were having speed problems on slower pc's but this causes the object to be clipped which is a big nono. Think of the object as a glorified sky box if you will.

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IanM

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Posted: 13th Jul 2005 22:36

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I've done this before - I have a skybox 10 units in size per side and keep it centred on the camera. It also has zwrite disabled. It works just great for me.

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Sephnroth

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Location: United Kingdom

Posted: 14th Jul 2005 03:09

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I tried it but it unfortunatly caused a series of its own problems where things depend on the cube keeping its size of -1000 -1000 -1000, tons of precalculated locations and stuff (it isnt actually a skybox, but can be thought of along the same lines)

What i really need is a way to tell darkbasic to ignore the clip distance for this one object and draw it regardless :/

DarkSDK/WinAPI Tutorial

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IanM

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Posted: 14th Jul 2005 05:32 Edited at: 14th Jul 2005 05:32

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I don't see the problem ... or am I missing something?

#include <DarkSDK.h>

#pragma warning( disable : 4244 )

const int MaxDistance = 50;

void DarkSDK(void)
{
    dbSyncOn();
    dbSyncRate(0);
    dbAutoCamOff();

dbMakeObjectCube(1, -5.0);
    dbPositionObject(1, 0.0, 0.0, 0.0);
    dbDisableObjectZRead(1);
    dbDisableObjectZWrite(1);

dbFogOn();
    dbFogDistance(50);
    dbSetCameraRange(1, 100);

for (int i=100; i < 200; ++i)
    {
        if (dbRnd(1) == 0)
            dbMakeObjectCube(i, 1.0);
        else
            dbMakeObjectSphere(i, 1.0);
        dbPositionObject(i, dbRnd(MaxDistance*2)-MaxDistance, dbRnd(MaxDistance*2)-MaxDistance, dbRnd(MaxDistance*2)-MaxDistance);
    }

while (LoopSDK() && !dbEscapeKey() )
    {
        if (dbUpKey())
            dbMoveCamera(0.5);
        if (dbDownKey())
            dbMoveCamera(-0.5);

dbXRotateCamera(dbCameraAngleX() + dbMouseMoveY());
        dbYRotateCamera(dbCameraAngleY() + dbMouseMoveX());

dbPositionObject(1, dbCameraPositionX(), dbCameraPositionY(), dbCameraPositionZ() );

dbSync();
    }
}

+ Code Snippet

#include <DarkSDK.h>

#pragma warning( disable : 4244 )

const int MaxDistance = 50;

void DarkSDK(void)
{
    dbSyncOn();
    dbSyncRate(0);
    dbAutoCamOff();

    dbMakeObjectCube(1, -5.0);
    dbPositionObject(1, 0.0, 0.0, 0.0);
    dbDisableObjectZRead(1);
    dbDisableObjectZWrite(1);

    dbFogOn();
    dbFogDistance(50);
    dbSetCameraRange(1, 100);

    for (int i=100; i < 200; ++i)
    {
        if (dbRnd(1) == 0)
            dbMakeObjectCube(i, 1.0);
        else
            dbMakeObjectSphere(i, 1.0);
        dbPositionObject(i, dbRnd(MaxDistance*2)-MaxDistance, dbRnd(MaxDistance*2)-MaxDistance, dbRnd(MaxDistance*2)-MaxDistance);
    }

    while (LoopSDK() && !dbEscapeKey() )
    {
        if (dbUpKey())
            dbMoveCamera(0.5);
        if (dbDownKey())
            dbMoveCamera(-0.5);

        dbXRotateCamera(dbCameraAngleX() + dbMouseMoveY());
        dbYRotateCamera(dbCameraAngleY() + dbMouseMoveX());

        dbPositionObject(1, dbCameraPositionX(), dbCameraPositionY(), dbCameraPositionZ() );

        dbSync();
    }
}

Works great here.

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Sephnroth

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Joined: 10th Oct 2002

Location: United Kingdom

Posted: 14th Jul 2005 05:56

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the problem is I have a 9000 line engine which has many many many refrances to this object which depend on its current size. For example the texture for this object is dynamic and represents a graph which starts looking odd when the object size is changed even when its positioned at the camera point :/

I did try though - i will fiddle with it somemore and i can probably get something acceptable up - but this really isnt optimal, it really should be excluded from the clipping system

Thanks for your help though btw, dont mean to sound unnapreiciative XD

DarkSDK/WinAPI Tutorial

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Dark GDK / making object ignore clipping distance