问题描述
在Three.js（或其他3D渲染器）中缩放3d模型的最佳做法是什么？
What is the best practise for scaling 3d models in Three.js (or other 3d renderers)?
以下是我刚才面临的一个例子：
Here is an example I just faced:
我加载模型并意识到模型的尺寸太小。然后我使用 mesh.scale.set（2,2,2）; 缩放网格，它是完美的大小。
I load a model in and realise the size of the model is too small. I then scale the mesh using mesh.scale.set(2,2,2); and it is perfect size.
在这种情况下我应该采取什么行动？我是否将其缩放（以编程方式缩放）或者我是否回到我的3D建模软件并将模型的大小加倍？
What action should I take in this scenario, do I leave it scaled like that (programatically scaled) or do I go back to my 3d modelling software and double the size of the model?
谢谢
推荐答案
这不是最佳实践的问题而不是优化。如果您的网格将始终缩放，则最好在建模软件中进行缩放。那个简单的语句 mesh.scale.set（2,2,2）; 是一个矩阵乘法，需要在每个渲染帧上发生。现在也许你的场景中没有太多的几何形状，在这种情况下你不在乎。但正如我所说，这是一个优化问题。如果您的场景有1000个这样的网格或1000000，那么该矩阵乘法将需要在每个网格中进行。尽可能优化。
It is not a matter of best practice but rather of optimization. If your mesh will always be scaled, it is better if you do the scaling in your modeling software. That simple statement mesh.scale.set(2,2,2); is a matrix multiplication that needs to happen on each frame rendered. Now maybe your scene does not have much geometry in it in which case you don't care. But as I said it is a matter of optimization. What if your scene had 1000 such meshes or 1000000. That matrix multiplication would need to happen for each one of them. Optimize whenever you can.
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