Libgdx旋转ModelInstance [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，我可以在迷宫般的（硬编码）世界中移动，碰撞检测工作。我也有一些工作A *寻路的敌人。
我还使用 FBX-Conv 来填充我的第一个（相当难看的）Blender模型，以获得 .g3db 文件。由于某种原因，模特在地板上而不是站立。当我将它导出为 .fbx 时，我可能有一些错误的设置。
为此我尝试 rotate（）他围绕 z-Axis 90 度，在中调用：
modelInstance.transform.rotate（Vector3.Z，90）在加载模型并实例化我的<$之后，show（）我的屏幕的方法c $ c> ModelInstance （在给定位置）。由于某种原因，它没有旋转。然后我把 rotate 方法放在渲染（delta）中，以为它现在每次渲染都会旋转90度环。但它反而停滞不前，就像它应该的那样。
好​​的，但现在我希望 modelInstance 到旋转到实际看起来的位置，这意味着它应该旋转，取决于我的 enemie s Vector3方向。
我已经用 modelInstance.transform.setTotranslation（enemie.getPosition（））设置了他的位置。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，位置 Vector不会直接使用，因为它会在 add（）方法中更改其值。
这样做，我再也看不到对象，这意味着它的位置也是错误的。

为什么会发生这种情况？
如何使用方向向我的 modelInstance 旋转？

非常感谢。

解决方案

我用@Xoppas帮助解决了这个问题。问题是：

1. 我使用 setToTranslation 来移动我的模型到给定的位置，但是这会重置轮换


2. 我很想念 setToRotation（Vector3，Vector3）方法。

所以解决方案是去 setToTranslation 首先，然后使用 setToRotation（Vector3方向，Vector3 face），其中方向是我的模型正在查找的方向， face 是面对，应该朝这个方向看，在我的情况下 Vector3.X 。

<希望它可以帮助别人。

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.

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

Thanks a lot.

解决方案

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

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.

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.

Hope it helps someone else.

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