libGDX设置旋转点3DlibGDX

2023-09-07 23:49:21 作者:生个野种叫回忆

我有两个对象,基地和武器,我需要的武器旋转点设置为基地的地位。

I have two objects base and weapon and I need to set rotate point of weapon to position of base.

public Test(){
position1 = new Vector3(0,0,0);
baseModel = modelLoader.loadModel(Gdx.files.getFileHandle("data/models/tower/bases/base1.g3db", FileType.Internal));
        base = new Base(baseModel, position1);

        position2 = new Vector3(3,10,5);

        weaponModel = modelLoader.loadModel(Gdx.files.getFileHandle("data/models/tower/weapons/weapon2.g3db", FileType.Internal));
        weapon = new Weapon(weaponModel, position2);
}

下面是更新方法

public void update(float delta){

        weapon.transform.rotate(0, 1, 0, 45*(delta/2));
        base.transform.rotate(0, 1, 0, 45*(delta/2));
}

感谢您的答案

推荐答案

点周围的旋转是相同的翻译到该点,旋转和平移然后回来。 所以这个过程包括3个步骤:

A rotation around a point is the same as translating to that point, rotating and then translating back. So this process consists of 3 steps:

转换到 rotationPoint ,例如翻译(3,0,0) 旋转约于中心(也就是现在的 rotationPoint ),例如旋转(0,1,0,45 *三角洲) 在转换回(翻译是相对于旋转),例如翻译(-3,0,0) Translate to the rotationPoint, for example translate(3, 0, 0) Rotate arround the center (which is now the rotationPoint), for example rotate(0,1,0, 45*delta) Translate back (the translation is relative to the rotation), for example translate(-3, 0, 0);

在这种情况下,code,那么看起来是这样的:

In this case the code then looks like this:

weapon.transform.translate(3, 0, 0).rotate(0,1,0, 45*delta).translate(-3, 0, 0);