酒杯破碎Smashing Wine Glass

Smashing Wine Glass _ Introduction

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

In this lesson, you will smash a wine glass then slow down time to hold onto the big splash. This effect involves both an RBD simulation for the shattered glass and a fluid simulation for the wine. You will learn how to set up the dynamic network and output the simulations. Visual effect shots often involve a combination of different kinds of dynamic solvers and Houdini’s dynamic network is designed to acheive a unified result with these different solvers.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

在本课程中，您将砸碎一个酒杯，然后放慢时间以保持大飞溅。这种效果既包括对碎玻璃的RBD模拟，也包括对酒的流体模拟。您将学习如何设置动态网络并输出仿真。视觉效果拍摄通常涉及各种动态求解器的组合，而Houdini的动态网络旨在通过这些不同的求解器获得统一的结果。

Smashing Wine Glass _ 1 _ Define the Basic Shape

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

To start, you will draw curve then revolve it to create the wine glass. Creasing will be used to sharpen some edges and then you will subdivide to create denser geometry for fracturing. You will then extract geometry from the wine glass to create a shape that you will use to simulate the fluid.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

首先，您将绘制曲线，然后旋转以创建酒杯。折痕将用于锐化某些边缘，然后细分以创建更密集的几何形状以进行折裂。然后，您将从酒杯中提取几何形状，以创建用于模拟液体的形状。

Smashing Wine Glass _ 2 _ Model the Bullet

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

To create the bullet geometry, you will start with a primitive sphere and slice it in half. Next you will polyextrude the open end then use polyfill to close the shape using quad topology. You will then subdivide to define the final shape. This object will be animated out of frame very quickly therefore lots of detail isn’t required.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

要创建项目符号几何，您将从原始球体开始并将其切成两半。接下来，您将对开口端进行多挤压，然后使用四边形拓扑使用polyfill封闭形状。然后，您将细分以定义最终形状。该对象将很快脱离帧动画，因此不需要很多细节。

Smashing Wine Glass _ 3 _ Fracture the Wine Glass

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

To define the cracks in the wine glass, you will create natural looking lines using the draw curve tool then extrude them into sheets of geometry. You will then agitate the surfaces using the mountain tool. This chaotic looking shape can then be merged into the wine glass object where you will set up a boolean operation that uses the sheets to shatter the glass.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

要定义酒杯中的裂纹，您将使用绘制曲线工具创建自然外观的线条，然后将其拉伸为几何图形。然后，您将使用登山工具搅拌表面。然后，可以将这种看起来混乱的形状合并到酒杯对象中，在其中您将设置一个布尔操作，该操作使用纸张来粉碎玻璃。

Smashing Wine Glass _ 4 _ Set up the RBD Simulation

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

You are now going to create a rigid body simulation using shelf tools. This will add a DOP (Dynamic Operators) network that brings together geometry, forces and a solver node. In the wine glass geometry network, nodes will be added to prepare the geometry for simulation. You will use convex proxies so the Bullet RBD solver can handle the odd-shaped pieces of glass.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

现在，您将使用架子工具创建刚体模拟。这将添加一个DOP（动态算子）网络，该网络将几何图形，力和求解器节点组合在一起。在酒杯几何图形网络中，将添加节点以准备几何图形以进行仿真。您将使用凸形代理，因此Bullet RBD求解器可以处理奇形玻璃。

Smashing Wine Glass _ 5 _ Add Fluids to the Simulation

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

Now that the bullet is smashing the glass, it is time to convert the wine object into a fluid that will become part of the integrated simulation. This means that the RBD and Fluid simulations take place in the same DOP network and will work as one system. At first, the fluid will be represented by particles that can then be surfaced to visualize the fluid.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

现在，子弹砸碎了玻璃，是时候将葡萄酒物体转换成液体，该液体将成为集成模拟的一部分。这意味着RBD和Fluid模拟在同一DOP网络中进行，并且将作为一个系统工作。首先，流体将由颗粒表示，然后可以将其表面化以可视化流体。

Smashing Wine Glass _ 6 _ Cache and Retime the Simulations

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

For this shot, you only need to compute 10 frames of the simulation. You will save this to disk then use a retime node to create a longer shot where the fluid slows down then reverses in time. The retimed fluid particles will then be surfaced and output as a 50 frame sequence which will define the final shot for rendering. The wine glass and bullet will then be retimed to match.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

对于此镜头，您只需要计算10帧模拟。您将其保存到磁盘，然后使用“重定时”节点创建更长的镜头，流体速度变慢，然后时间倒退。然后，重新定时的流体粒子将浮出水面，并以50帧序列输出，该序列将定义要渲染的最终镜头。然后将酒杯和子弹重新计时以匹配。

Smashing Wine Glass _ 7 _ Set up and Render the Shot

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

To render the shot, you will reference the USD files into the Solaris Stage then add a backdrop. Solaris is a new context of Houdini that uses LOP nodes to set up the USD Scene Graph. Next, you will add and position a camera and then an environment light. The Karma renderer will then be invoked in the viewport to create a preview render of the shot.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

要渲染镜头，您将在USD阶段中引用USD文件，然后添加背景。 Solaris是Houdini的新上下文，它使用LOP节点设置USD场景图。接下来，您将添加并放置摄像机，然后放置环境光。然后，将在视口中调用Karma渲染器以创建镜头的预览渲染。

Smashing Wine Glass _ 8 _ Assign Materials and Render a Sequence

Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

Now you can add materials to the wineglass, wine and bullet. These materials will become part of the USD Scene Graph and will get assigned to the geometry using a LOP node. You can then use a Karma LOP to prepare your render settings including the use of the Nvidia Optix Denoiser. After you render, you can load the sequence into Mplay to review the results.
谷歌翻译：
Lessons and Project Files: https://www.sidefx.com/tutorials/smashing-wine-glass/

现在，您可以向酒杯，葡萄酒和子弹中添加材料。这些材料将成为“ USD场景图”的一部分，并使用LOP节点分配给几何。然后，您可以使用Karma LOP来准备渲染设置，包括使用Nvidia Optix Denoiser。渲染后，您可以将序列加载到Mplay中以查看结果。