制作针织效果

制作针织效果

There are very few things more hypnotic than watching an embroidery machine do its work. When watching my wife’s machine working on festive decoration, I thought about how I’d create something similar in Houdini. Turns out it isn’t too complicated once you’ve figured out how to make the stitches run into a certain direction.

We decided that for the sake of art directability (does that word exist?) we’d settle on a manual appropach of drawing guide splines in order to define the direction in which the individual stitches would run. Next we’d create tangents based on those splines which we then feed into a velocity volume. Another way to look at it is that this works pretty similar to what you’d do when combing hair or fur.

In this video we go over the basic setup and creating a single spline for each stitch. For rendering (get the final render setup on our Patreon) we added a background with a weave shader as well as created secondars spines that coil around our stitch splies, in order to give the impression of twistes yarn.

很少有比看绣花机更能催眠的东西了。当我看到妻子在给节日制作绣花装饰时,我就在想能不能用Houdini实现类似的效果。事实证明,一旦你弄清楚如何定义缝线的方向,事情就变得简单了。

为了达到艺术化的效果,我们使用手动绘制曲线的方式来定义缝线的走线方向。接下来基于这些曲线计算切线方向并导入到一个速度场中。这种思路跟梳理毛发特别像。

这个教程将从零开始,讲述如何为每一根缝线创建曲线。至于渲染,我们在背景创建了一个自定义材质模拟织布的效果。

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