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  Billboards  (Read 964 times)
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Offline arne

Senior Member




money is the worst drug- we should not let it rule


« Posted 2005-11-27 00:36:40 »

Hi

I want to use billboards, where the center of the billboard is the origin.

until now the geometry for billboards gets created like this:
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        float halfParticleWidth = width / 2;

        // get the center of particle

        float x = 0;
        float y = 0;
        float z = 0;

        // calculate all the corners of the quad
       vec[0].set(-halfParticleWidth, 0, 0);
        vec[1].set(+halfParticleWidth, 0, 0);
        vec[2].set(+halfParticleWidth, height, 0);
        vec[3].set(-halfParticleWidth, height, 0);


I was only able to adjust it my needs by changing the code to:
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        float halfParticleWidth = width / 2;

        // get the center of particle

        float x = 0;
        float y = 0;
        float z = 0;

        // calculate all the corners of the quad
       vec[0].set(-halfParticleWidth, -height/2, 0);
        vec[1].set(+halfParticleWidth, -height/2, 0);
        vec[2].set(+halfParticleWidth, height/2, 0);
        vec[3].set(-halfParticleWidth, height/2, 0);


Is there a better way, or should I add this to IssueZilla?

It's pretty bad to have changes in the Xith-code, because it's for a project (Spacebomber) and you can't request from all to change their Xith. (At least it would be really nasty)

Arne

:: JOODE :: Xith3d :: OdeJava ::
Offline Amos Wenger

Senior Member




Everything's possible, but not everything's fun...


« Reply #1 - Posted 2005-11-28 08:53:42 »

I think billboards are created in a mysterious way..
However if you need a change for spacebomber just do another class that isn't included in Xith.

"Once you start working on something, don't be afraid of failure and don't abandon it. People who work sincerely are the happiest"
Offline arne

Senior Member




money is the worst drug- we should not let it rule


« Reply #2 - Posted 2005-11-28 12:56:11 »

I think billboards are created in a mysterious way..
However if you need a change for spacebomber just do another class that isn't included in Xith.
That's the problem - I copied the modified Billboard class to Spacebomber and used that, but then it mysteriously doesn't work anymore.

:: JOODE :: Xith3d :: OdeJava ::
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline arne

Senior Member




money is the worst drug- we should not let it rule


« Reply #3 - Posted 2005-11-28 13:10:20 »

Hah! I hacked around it now Smiley
I simply extend my Billboard class from the Xith-Billboard, but overwrite all functions - that works Cheesy

A change of Xith would be better still, because I create all things twice Sad

:: JOODE :: Xith3d :: OdeJava ::
Offline Amos Wenger

Senior Member




Everything's possible, but not everything's fun...


« Reply #4 - Posted 2005-11-29 18:24:58 »

Hah! I hacked around it now Smiley
I simply extend my Billboard class from the Xith-Billboard, but overwrite all functions - that works Cheesy

A change of Xith would be better still, because I create all things twice Sad
We could do some "reference" attribute (enum {CENTER, BOTTOM, UP}) in the standard Xith billboard class.. It would be rather easy to do.

"Once you start working on something, don't be afraid of failure and don't abandon it. People who work sincerely are the happiest"
Offline William Denniss

JGO Coder


Projects: 2


Fire at will


« Reply #5 - Posted 2005-11-30 13:31:37 »

Quote
We could do some "reference" attribute (enum {CENTER, BOTTOM, UP}) in the standard Xith billboard class.. It would be rather easy to do.
Quote

Such a change sounds fine to me (though we're not at 1.5 yet with Xith3D).

I agree that the billboard class is a bit messy.

Will.

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