CGCircuit - Burning Cloth Tear

胡迪尼燃燒的布模擬教程。

主要流程：

我們將通過使用牛皮紙創建一個簡單的布料設置來開始本課程。

創建碰撞體幾何體并為其制作動畫，以驅動布料的主要變形。

使用自定義增長求解器，我們將能夠手動刪除牛皮紙對象中的約束，從而導致布撕裂。

清理幾何體后，我們繼續處理粒子。

我們將基于我們創造的布料來設置粒子發射源。

在這里，我們將討論如何手動插值我們的粒子源以創建平滑的結果，而不會出現問題。

我們將創建一個煙霧模擬，然后使用速度場平流我們的粒子，我們將創建 2 個不同的粒子層。

在渲染部分，一切都將相當簡單明了。我們將使用巨型掃描紋理創建布料材質，并為粒子層設置一個簡單的著色器。

在Nuke中，我們將所有東西都整合在一起。

我們將使用我們自己的自定義漸變直接在Nuke內部為粒子著色，以確保最大的靈活性。

所以我希望你會喜歡這門課程，讓我們開始吧！

Description

Welcome to a new Houdini tutorial, Burning Cloth Tear

Vellum & Attribute Growth

We will start this course by creating a simple cloth setup using Vellum.

We will create and animate the collider geometry to drive the main deformations of our cloth.

Using a custom growth solver we will be able to manually delete constraints from the vellum object, causing the cloth to tear.

To have more flexibility, we will create a separate vellum simulation with wind and noise, which we will combine with our main tearing simulation. So we will be essentially layering two separate vellum simulations on top of eachother.

Particles

After we cleanup the geometry, we move on to particles.

We will base our particle emission source on the cloth that we created.

Here we will talk about how to manually interpolate our particle source to create a smooth result without stepping issues.

We will create a smoke simulation first, and then advect our particles using the velocity field, and we will create 2 different layers of particles.

Rendering

In the rendering section, everything will be fairly simple and straight forward. We will create a cloth material using megascans texture, and set up a simple shader for our particle layers.

Nuke / Compositing

Inside Nuke we bring everything together. In this section I will show you a very flexible way to add a logo to our cloth, that follows the animation.

We will map the logo using the UV coordinates from our cloth, and also show you how to use the normals AOV in order to re-light our geometry.

We are going to color the particles directly inside of Nuke, using our own custom gradient, to ensure maximum flexiblity.

So I hope you will enjoy this course and let's get started!