Libgdx 旋转模型实例 [英] Libgdx rotate ModelInstance

问题描述

我正在开发我的第一个 libgdx 3D 游戏.到目前为止，我可以在类似迷宫(硬编码)的世界中移动，碰撞检测有效.我也有一些使用 A* Pathfinding 的敌人.我还使用 FBX-Conv 获得了一个 .g3db 文件.出于某种原因，模型躺在地板上而不是站立.当我将它导出为 .fbx 时，也许我有一些错误的设置.为此，我尝试通过调用将 rotate() 他围绕 z-Axis 旋转 90 度:modelInstance.transform.rotate(Vector3.Z, 90) 在我的 Screen 的 show() 方法中，加载 Model 后 并实例化我的 ModelInstance(在给定位置).出于某种原因，它没有旋转.然后我将 rotate 方法放在 render(delta) 中，认为它现在每个渲染循环都会旋转 90 度.但相反，它原地不动，就像它应该的那样.好的，但现在我希望 modelInstance rotate 到它实际看起来的位置，这意味着它应该旋转，具体取决于我的 enemie 的 Vector3 方向.我已经准备好用 modelInstance.transform.setTotranslation(enemie.getPosition()) 来设置他的位置，这很完美.所以我想我也可以使用 modelInstance.transform.setToRotation(Vector3 v1, Vector3 vs)，v1 = enemie.getPosition() 和 v2 = enemie.getPosition().add(enemie.getDirection).请注意，position 向量不是直接使用的，因为它会在 add() 方法中更改其值.这样做，我再也看不到对象了，这也意味着它的位置是错误的.

I am developing my first libgdx 3D game. Until now i can move arround in a maze-like (hardcoded) world, collision detection works. Also i have some enemies with working A* Pathfinding. I also loded my first (pretty ugly) Blender model, using FBX-Conv to get a .g3db file. For some reason the model lise on the floor instead of standing. Maybe i had some wrong settings when i exported it as .fbx. For that i tryed to rotate() him arround the z-Axis by 90 degrees by calling: modelInstance.transform.rotate(Vector3.Z, 90) in the show() method of my Screen, after loading the Model and instantiating my ModelInstance (at a given position). For some reason it did not rotate. Then i put the rotate method in the render(delta), thinking, that it would now rotate 90 degrees every render loop. But instead it was standing still, like it should. Okay, but now i want the modelInstance to rotate to where it actually looks, meaning it should rotate, depending on my enemies Vector3 direction. I am allready setting his position with modelInstance.transform.setTotranslation(enemie.getPosition()) which works perfect. So i thought i can also use modelInstance.transform.setToRotation(Vector3 v1, Vector3 vs), with v1 = enemie.getPosition() and v2 = enemie.getPosition().add(enemie.getDirection). Note, that the position Vector is not used directly, as it would change its values inside the add() method. Doing this, i don't see the object anymore, meaning also its position is wrong.

为什么会这样?以及如何使用 direction 向量旋转我的 modelInstance?

Why is this happening? And how can i rotate my modelInstance by using the direction vector?

非常感谢.

推荐答案

我在 @Xoppas 的帮助下解决了这个问题.问题是:

I solved this with @Xoppas help. The problem was:

1. 我使用 setToTranslation 将我的 Model 移动到给定位置，但这也会重置 rotation
2. 我误解了 setToRotation(Vector3, Vector3) 方法.

1. i used setToTranslation to move my Model to a given position, but this als resets the rotation
2. I missunderstood the setToRotation(Vector3, Vector3) method.

所以解决办法是先setToTranslation，然后使用setToRotation(Vector3 direction, Vector3 face)，其中direction是方向，我的 Model 正在看，face 是 face，它应该朝这个方向看，在我的例子中是 Vector3.X.

So the solution was to to the setToTranslation first, and then use setToRotation(Vector3 direction, Vector3 face), where direction is the direction, in which my Model is looking and face is the face, which should look in this direction, in my case the Vector3.X.

希望能帮到别人.

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