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Mar 13, 2018

Polygon Wind Shader

In 2017 I was looking for a wind shader to use on a low poly tree model. I couldn't find one that provided the visual I was looking for, so I started to develop the Polygon Wind Shader.

It is designed to generate a more suttle and organic wind movement on trees. But it's not great for heavy wind effects. Lately I haven't had much time to work on it, so I decided to publish the source code here and make it available so that anyone can use and modify it.

Here are some videos of what I achieved using it:

How to use it:

Just apply the shader to a material and apply the material to your asset. The ideal tree asset is one with a single mesh.

The shader has various parameters for you to tweak:

  • Wind Wave Size;
  • Tree Sway Displacement;
  • Foliage Wiggle Amount;
  • Branches Up/Down;
  • Foliage Wiggle Speed;
  • Tree Sway Stutter;
  • Tree Sway Speed;
  • Wind Direction;
  • Red Vertex Influence;
  • Blue Vertex Influence.

It uses a series of inputs to calculate the final vertex position, one of them being the vertices colors of the mesh:

  • Red - Use on the branches to enable the up/down movement;
  • Blue - Use it on the leaves to get that organic wiggle.