Tuesday, October 6, 2015

Light Ray Tutorial


painting light ray
A quick way to add light ray (god ray) to your artwork is to use the "radial zoom blur" filter, which is available in most painting software. Below is the quick explanation on how to add light rays using radial zoom blur filter.

painting light ray

Procedural Texture

Instead of painting the light ray manually, we can also use procedural texture to generate light ray. Generally, it can be achieve with just 2 steps with Photoshop, AfterEffects or Blender3D.
  1. Generate a procedural texture.
  2. Apply radial zoom blur to it.


Photoshop
Generate a procedural cloud(noise) texture. Apply radial zoom blur to it. You will have to adjust the contrast/brightness to get better result.

photoshop god ray photoshop god ray

Blender3D
For Blender3D, use the procedural cloud texture (or any other texture like Musgrave). Then apply the radial zoom blur via "Directional Blur" node. Remember to change the "Iteration", "Zooms" value. You can even add in the "Spin" value if you want.

blender3d god ray

AfterEffects
For AfterEffects, use procedural texture from "Fractal Noise". Then apply the radial zoom blur via "Radial Blur" or "CC Radial Blur".

aftereffects god ray


Animation

Why procedural texture? The main reason to choose procedural texture is the ability to animate the light ray (Maybe not in Photoshop).

In AfterEffects, you can animate the "Evolution" value. In Blender3D, you can offset the texture mapping. All these will simulate an effect which look like ray passing through moving clouds.



Artwork

Some of my artworks with light rays.

peek morning beam

Reference

DeviantArt Light Ray Tutorial
DeviantArt Ghibli style girl sitting on tree
Deviantart Morning
Deviantart Beam
Youtube Light ray using procedural texture

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