Simple Breaking Waves in Houdini

本文介绍了如何在Houdini中利用VOP创建卷浪效果。通过让点围绕特定轴旋转,并利用Ramp控制旋转幅度,实现卷浪的平滑渐变。卷浪的形状可以根据点到轴的距离变化,通过极坐标转换实现。此外,通过矩阵转换,卷浪可以按任意角度变形。最后,作者提到由于时间紧张,将稍后分享相关插件。

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之前看贫尼在群里使用houdini做的卷浪,自己用VOP连了下,挺爽。尤其是卷浪的中心轴在y轴移动时可以模拟卷浪的各种phase,从开始卷到要铺平都可以光滑渐变。

原理就是这么个样子的:

让点绕某个轴转就行了,转的幅度用一个Ramp控制,这个ramp的输入为点到轴的距离,当然因为是局部的旋转,所以不能一个简单的transform op就搞定,但VOP是无所不能搞定的,让点旋转只需要转换成极坐标然后把角度加加减减就行了,反正简化后的公式如果大家现在还在上高中的话一口就能喊出是

P(x,y) = ( x*cos(a)+y*sin(a) ,  x*sin(a)-y*cos(a) )

在VOP里连出来就是


Acoustoelastic guided waves refer to the phenomenon where elastic waves are generated due to the interaction between acoustic waves and the elastic properties of a material. In waveguides, such as pipes or bars, these waves can propagate along the length of the waveguide, allowing for non-destructive testing and monitoring of the material's properties. One important factor that affects the propagation of acoustoelastic waves is the prestress in the material. Prestress refers to the state of stress in a material before any external forces are applied. This can arise due to manufacturing processes, such as casting or rolling, or due to environmental factors, such as temperature changes. In waveguides with arbitrary prestress, the propagation of acoustoelastic waves can be modeled using mathematical equations that take into account the material's elastic properties, the waveguide's geometry, and the prestress state. These equations can be solved numerically to predict the behavior of the waves under different conditions. For example, if a waveguide experiences a sudden change in temperature, the prestress state may change, which can affect the propagation of acoustoelastic waves. By modeling the waveguide's behavior, engineers can predict how the waves will propagate and detect any changes in the material's properties. Overall, acoustoelastic guided waves in waveguides with arbitrary prestress have important applications in non-destructive testing and monitoring of materials in a variety of industries, including aerospace, automotive, and construction.
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