Houdini并不可怕Houdini Isn’t Scary

Houdini Isn’t Scary – Part 1: Basics

Welcome back to a Houdini beginner new tutorial series from Nine Between! We’ve been away for a while as we were creating content and working on our own projects. However, we’re back on YouTube and Patreon with brand new content and Tutorials Series.

This is Part 1 of the ‘Houdini Isn’t Scary’ series. This is for anyone who would like to learn Houdini but doesn’t know quite where to start. From here, I’ll take you through Houdini the way I learnt it but with far less of the hiccups that I had going through it. We’ll start with the basics in this part and gradually build up to advanced dynamics as the weeks go by. Feel free to leave any questions you have in the comments below and we will get back to them.

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谷歌翻译：
欢迎回到《九人间》的Houdini初学者新教程系列！在创建内容并开发自己的项目时，我们已经离开了一段时间。但是，我们将以全新的内容和教程系列重返YouTube和Patreon。

这是“ Houdini并不可怕”系列的第1部分。这适用于想学习Houdini但不知道从哪里开始的任何人。从这里开始，我将按照您学习Houdini的方式带您进入Houdini，但所经历的麻烦却要少得多。我们将从这部分的基础知识开始，并逐步发展为先进的动态技术。请随时在下面的评论中留下您的任何问题，我们将尽快与他们联系。

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Houdini Isn’t Scary – Part 2: Objects

Welcome back to Part 2 of the Houdini beginner tutorial series from Nine Between!

This part goes over creating multiple objects. Each object can represent a single aspect of a larger setup. In this case, we are creating a donut and need three different objects to represent each part of the donut; the actual donut, the icing and the sprinkles. You can of course create them all as one object but by separating them, we make our setup easier to work with. If we would like to make a change to one particular part of the donut, we know where to find it as a single contained part.

We also touch on attributes. These are arguably the most important aspect of Houdini once the basics are understood. They can be seen as characteristics of a geometry. For example, if a point is blue, it would have an attribute called ‘Cd’. ‘Cd’ stands for ‘Color Diffuse’. This is just one of many attributes. Another would be ‘N’ which is your normal direction. This is the vector perpendicular to a face.

Hopefully this tutorial eases you into Houdini a bit more.

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Part 2 File:
https://www.dropbox.com/s/89vdkx7heh7cclw/Houdini_Isnt_Scary_Part2_Donut.hiplc?dl=0
谷歌翻译：
欢迎回到Nine Between的Houdini初学者教程系列的第2部分！

这部分将介绍创建多个对象。每个对象都可以代表较大设置的单个方面。在这种情况下，我们要创建一个甜甜圈，并且需要三个不同的对象来表示甜甜圈的每个部分。实际的甜甜圈，糖衣和撒上。您当然可以将它们全部创建为一个对象，但是通过将它们分开，我们可以使设置更易于使用。如果我们想对甜甜圈的一个特定部分进行更改，我们知道在哪里可以找到它作为一个单独的部分。

我们还涉及属性。一旦了解了基础知识，这些无疑是Houdini最重要的方面。它们可以看作是几何图形的特征。例如，如果一个点是蓝色的，它将具有一个名为“ Cd”的属性。 “ Cd”代表“色散”。这只是许多属性之一。另一个是“ N”，这是您的正常方向。这是垂直于面部的向量。

希望本教程可以使您轻松进入Houdini。

如果您喜欢本教程，请考虑轻轻地破坏“赞”按钮并进行订阅。

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第2部分文件：
https://www.dropbox.com/s/89vdkx7heh7cclw/Houdini_Isnt_Scary_Part2_Donut.hiplc?dl=0

Houdini Isn’t Scary: Part 3 – Dynamics

Welcome back to Part 3 of the Houdini beginner tutorial series from Nine Between!

In this part, we go over how to create dynamics. Dynamics are things that are driven by time. In Houdini, there is a separate context for working with Dynamics; it’s called DOPs (Dynamic Operators). Other geometry based work is done in SOPs (Surface Operators). In this tutorial though, we are going to be working with POPs (Particle Operators which are a subset of DOPs).

When we create a dynamics network, we intend on outputting a simulation. A simulation is simply the calculated output of a dynamics network. If our network tries to calculate how liquid would move over time, it would take fluid dynamics into account, do some calculations (this part takes time for the computer to do) and then output a simulation. If we change anything in the dynamics network, we would need to re-simulate. All of the calculations are done by what is known as a solver. Each type of dynamics network in Houdini uses a different solver (FLIP, Pyro, Vellum, RBD, etc.).

The idea in this part is to create some particles, sprinkle them over the donut dynamically, bring it into our sprinkles node, and turn each particle into a sprinkle with our existing setup.

Hope this is useful and helps you to understand dynamics. If you enjoyed this tutorial, please leave a like, and consider subscribing. Leave any questions or comments down below and we will get to them.

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File used in this tutorial:
https://www.dropbox.com/s/89vdkx7heh7cclw/Houdini_Isnt_Scary_Part2_Donut.hiplc?dl=0
谷歌翻译：
欢迎回到Nine Between的Houdini初学者教程系列的第3部分！

在这一部分中，我们介绍了如何创建动力学。动态是受时间驱动的事物。在Houdini中，有一个单独的上下文可以使用Dynamics。它称为DOP（动态算子）。其他基于几何的工作在SOP（表面操作员）中完成。在本教程中，我们将使用POP（粒子运算符，它是DOP的子集）。

创建动力学网络时，我们打算输出模拟。模拟只是动力学网络的计算输出。如果我们的网络试图计算液体随时间的运动方式，它将考虑流体动力学，进行一些计算（这部分时间需要计算机完成），然后输出模拟。如果我们更改动力学网络中的任何内容，则需要重新模拟。所有的计算都由所谓的求解器完成。 Houdini中的每种动力学网络都使用不同的求解器（FLIP，Pyro，Vellum，RBD等）。

这部分的想法是创建一些粒子，将它们动态地撒在甜甜圈上，将其带入我们的“撒布”节点，然后使用我们现有的设置将每个粒子变成一个撒布。

希望这对您有用，并有助于您了解动态。如果您喜欢本教程，请点赞，然后考虑订阅。在下面留下任何问题或评论，我们将继续进行。

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本教程中使用的文件：
https://www.dropbox.com/s/89vdkx7heh7cclw/Houdini_Isnt_Scary_Part2_Donut.hiplc?dl=0

Houdini Isn’t Scary – Part 3 And a Bit: FAQ

Welcome back to another Houdini Isn’t Scary Tutorial. This one is more of a clarification lesson. I highly suggest you watch it as it goes over some important techniques for not losing your mind and crying into a pillow while using Houdini. These are some of the ‘Gotchas’ in the basics of Houdini and this tutorial will remove the fear factor from each problem you may have.
In Part 4, we will be tackling a brand new section of Houdini so you can treat this as a breather for now.

If you need anything or have any questions, please leave a comment down below. Even if you have a criticism or suggestion, we’re always happy to hear from you. If you found some value in this video, please consider leaving a like, subscribing and/or visiting our Patreon.

Thanks for watching!

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谷歌翻译：
欢迎回到另一个Houdini并不可怕的教程。这更多是一个澄清课。我强烈建议您观看它，因为它涉及了一些重要技术，在使用Houdini时不会失去理智并在枕头上哭泣。这些是Houdini基础知识中的一些“陷阱”，本教程将消除您可能遇到的每个问题中的恐惧因素。
在第4部分中，我们将处理Houdini的一个全新部分，因此您现在可以将其视为透气片。

如果您有任何需要或有任何疑问，请在下面留言。即使您有任何批评或建议，我们也总是很高兴收到您的来信。如果您在此视频中发现了一些价值，请考虑留下一个赞，订阅和/或访问我们的Patreon。

感谢收看！

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Houdini Isn’t Scary – Part 4: Lights Camera Icing

Welcome back to Houdini Isn’t Scary – Part 4: Lights, Camera, Icing. In this tutorial, we are going over the setting up of a render. ‘Rendering’ is the process of taking our objects and creating an output. That output in this case is an image.

When we render in Houdini, we are basically taking a picture of the objects in our scene (the donut, icing and sprinkles). Much like in real life, you cannot take a picture unless you have a camera and your camera is useless unless there is light. In Houdini we create lights and a camera. However, something else that comes into play is the way that the actual objects interact with light. Objects are gold, pink, black, white, rough, glossy, metallic, see-through etc… We need to do this in Houdini as well. For this, we create materials.

These materials control the way our objects look. We control all of the needed settings for our materials by using a shader. A shader is a system that controls how light shades an object. In Houdini, we generally use the Principled Shader. This is a shader that is meant to be intuitive and simple because it has been cut down to its basics. However, it strives to be realistic in the way it represents objects. Simply, we don’t have to do any complicated math as to how light bounces or interacts with an object, we can just set some parameters and the Principled Shader does the rest. It also comes with presets. You want glass? Use the glass preset. You want gold paint? Use the gold paint preset. You want anything else? You can make it yourself with little difficulty.

Finally, once we have all of that, we can render our scene. In the next part, we will see how to save the renders to disk. We will also cover what are known as ROPS. They have their own extra settings that we can configure which change the way the render comes out.

Thank you for watching, if you enjoyed this tutorial, please consider leaving a like. Subscribe to never miss a tutorial and if you’d like more content, or show some love, you can visit our Patreon.

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Download Part 3’s File Here:
https://www.dropbox.com/s/2invlf793h59b2d/Houdini_Isnt_Scary_Part3_Dynamics.hiplc?dl=0
谷歌翻译：
欢迎回到Houdini并不害怕-第4部分：灯光，照相机，结冰。在本教程中，我们将介绍渲染的设置。 “渲染”是获取对象并创建输出的过程。在这种情况下，该输出是图像。

当我们在Houdini中进行渲染时，基本上是在对场景中的对象（甜甜圈，糖霜和洒水）拍照。就像在现实生活中一样，除非拥有相机，否则无法拍照；除非有灯光，否则相机将无用。在Houdini，我们创建灯光和照相机。但是，实际物体与光线相互作用的方式还有其他作用。对象是金色，粉红色，黑色，白色，粗糙，光滑，金属，透明等。我们也需要在Houdini中进行此操作。为此，我们创建材料。

这些材料控制着我们物体的外观。我们通过使用着色器来控制材料的所有必需设置。着色器是控制光如何对对象进行着色的系统。在Houdini中，我们通常使用Principled Shader。这是一个直观且简单的着色器，因为它已被缩减为基础。但是，它以表示对象的方式努力做到现实。简而言之，我们不必对光如何反弹或与对象交互进行任何复杂的数学运算，只需设置一些参数，其余的就由Principled Shader完成。它还带有预设。你要杯酒吗？使用玻璃预设。你想要金漆吗？使用金漆预设。你还想要什么吗？您可以轻松完成此任务。

最后，一旦有了所有这些，就可以渲染场景。在下一部分中，我们将看到如何将渲染保存到磁盘。我们还将介绍所谓的ROPS。它们具有自己的额外设置，我们可以配置这些设置来更改渲染的输出方式。

感谢您的观看，如果您喜欢本教程，请考虑点赞。订阅永不错过任何教程，如果您想了解更多内容或表达一些爱意，可以访问我们的Patreon。

Patreon：
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在此处下载第3部分的文件：
https://www.dropbox.com/s/2invlf793h59b2d/Houdini_Isnt_Scary_Part3_Dynamics.hiplc?dl=0

Houdini Isn’t Scary – Part 5 – Rendering

Welcome back to Part 5 of Houdini Isn’t Scary, this part is the continuation of the donut rendering part. We are finishing off the render settings needed for rendering our donut. This means that we’re covering ROPs as well as Motion blur, Velocity blur and how to actually save out an image from Houdini.

When we ran our sprinkles through the DOP network, we generated velocity. That velocity can be used to blur our sprinkles as they fall. To do that, we need to activate our motion blur in two places: Firstly, on the sprinkles object. And, secondly, on the render node in our /out network.

Next we activate depth of field. Depth of field is the blurring that you notice in an image when things fall in and out of focus. At a larger scale, depth of field is less noticeable but as we move to smaller scales, the amount of blurring increases. For the most part the blurring is controlled by the scale and by the f-stop. If you’d like to understand f-stop in real life (and by association in Houdini), here’s a great article:
https://photographylife.com/f-stop

Finally, we need to render our image out. To do this, we need to tackle the intimidating ‘Output Picture’ on our Mantra ROP. The default expression is usually alright to use but if you’re iterating and want to control the filenames, it is best to understand a bit of hscript. $HIP, is simply the folder that your file is saved in. /RENDER could be anything, it could be /images or /donutImageFiles. It is a sub-folder of $HIP. $HIPNAME is the name of the file. Usually your files might be named something like ‘DonutProjectFile.hip’. $HIPNAME would then take ‘DonutProjectFile’ as a value. $OS is the name of the render node (‘mantra_ipr’ in this case) but that makes it useful if you have multiple render nodes and want each one to output something different. $F4 is a alteration of $F. $F is the number of the frame you’re on. $F4 just means add some padding to the number with 4 zeroes (eg. 0001, 0002, 0003 etc.). And then we have the filetype. By default it is .exr. However, it can be set to .jpg, .png, .img etc. I do recommend learning to work with .exr though. Here is some useful information on filetypes:
https://www.pluralsight.com/blog/film-games/vfx-file-formats-you-need-to-know

That’s it, Part 5 is done and so are the basics. We are going to create something awesome in the upcoming parts so I’d suggest subscribing if you’ve liked the content so far; you won’t want to miss this.

Thanks for watching, if you need the file from Part 4, you can get it here:
https://www.dropbox.com/s/54x15ushhwyense/Houdini_Isnt_Scary_Part4_LightsCameraIcing.hiplc?dl=0

Part 5’s file is here as well if you need it:
https://www.dropbox.com/s/irjciber2v9uuyv/Houdini_Isnt_Scary_Part5_Rendering.hiplc?dl=0

If you’d like to support us on Patreon, you can find us here:
https://www.patreon.com/NineBetween
谷歌翻译：
欢迎回到Houdini的“第5部分”，这并不可怕，这是甜甜圈渲染部分的延续。我们正在完成渲染甜甜圈所需的渲染设置。这意味着我们涵盖了ROP，运动模糊，速度模糊以及如何从Houdini中实际保存图像。

当我们通过DOP网络运行洒水时，便产生了速度。当洒落时，该速度可以用来模糊洒落。为此，我们需要在两个地方激活运动模糊：首先，在洒对象上。其次，在我们/ out网络中的渲染节点上。

接下来，我们激活景深。景深是当物体落入和聚焦不清晰时您在图像中注意到的模糊。在较大的比例下，景深不太明显，但随着我们移到较小的比例，模糊量会增加。在大多数情况下，模糊是由缩放比例和f-stop控制的。如果您想了解现实生活中的“ f-stop”（以及Houdini中的关联），这是一篇很棒的文章：
https://photographylife.com/f-stop

最后，我们需要渲染图像。为此，我们需要解决Mantra ROP上令人生畏的“输出图片”。默认表达式通常可以使用，但是如果您要迭代并且想要控制文件名，则最好了解一些hscript。 $ HIP只是文件保存所在的文件夹。/RENDER可以是任何东西，可以是/ images或/ donutImageFiles。它是$ HIP的子文件夹。 $ HIPNAME是文件名。通常，您的文件可能会被命名为“ DonutProjectFile.hip”。然后，$ HIPNAME将使用“ DonutProjectFile”作为值。 $ OS是渲染节点的名称（在本例中为'mantra_ipr'），但是如果您有多个渲染节点并希望每个节点输出不同的内容，则它很有用。 $ F4是$ F的变体。 $ F是您所在的帧的编号。 $ F4只是意味着向带有4个零的数字（例如0001、0002、0003等）添加一些填充。然后我们有了文件类型。默认情况下，它是.exr。但是，可以将其设置为.jpg，.png，.img等。尽管如此，我还是建议您学习使用.exr。以下是有关文件类型的一些有用信息：
https://www.pluralsight.com/blog/film-games/vfx-file-formats-you-need-to-know

就是这样，第5部分已经完成，基础知识也已完成。我们将在接下来的部分中创建一些很棒的东西，因此建议您订阅到目前为止是否喜欢该内容；您不会想错过的。

感谢您的观看，如果您需要第4部分中的文件，可以在这里获取：
https://www.dropbox.com/s/54x15ushhwyense/Houdini_Isnt_Scary_Part4_LightsCameraIcing.hiplc?dl=0

如果需要，第5部分的文件也位于此处：
https://www.dropbox.com/s/irjciber2v9uuyv/Houdini_Isnt_Scary_Part5_Rendering.hiplc?dl=0

如果您想在Patreon上支持我们，可以在这里找到我们：
https://www.patreon.com/NineBetween