Three.js - 使用 scale.set() 缩放模型或增加模型大小? [英] Three.js - Scale model with scale.set() or increase model size?

问题描述

在 Three.js(或其他 3d 渲染器)中缩放 3d 模型的最佳实践是什么?

What is the best practise for scaling 3d models in Three.js (or other 3d renderers)?

这是我刚刚遇到的一个例子:

Here is an example I just faced:

我加载了一个模型，发现模型太小了.然后我使用 mesh.scale.set(2,2,2); 缩放网格，它是完美的尺寸.

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措施，我是让它保持这样的缩放比例(以编程方式缩放)，还是返回到我的 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，而是优化的问题.如果您的网格总是被缩放，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，需要在渲染的每一帧上发生.现在也许您的场景中没有太多几何体，在这种情况下您并不关心.但正如我所说，这是一个优化问题.如果您的场景有 1000 个或 1000000 个这样的网格会怎样.矩阵乘法需要对每个网格进行.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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