libGDX设置旋转点3D [英] libGDX set rotation point 3D
本文介绍了libGDX设置旋转点3D的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
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 exampletranslate(3, 0, 0)
- Rotate arround the center (which is now the
rotationPoint
), for examplerotate(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);
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