Offsets the UVs of the screen according to a flow map texture, giving the scene an undulating appearance. This effect can also overlay caustics onto the scene based on a caustics texture, which is sampled multiple times and scrolled in different directions.

Parameters

Underwater Settings

  • Wave Flow Map - A texture representing the movement of screen UVs. The red and green channels of the image encode the strength and direction of movement of each part of the screen.
  • Wave Strength - How strongly the Wave Flow Map should distort the screen UVs.
  • Wave Flow Tiling - How many times the Wave Flow Map should be tiled over the screen.
  • Wave Flow Speed - How quickly the Wave Flow Map scrolls over the screen.

Caustics Settings

  • Caustics Mode - Caustics are complex light reflections and refractions caused by curved surfaces, such as water ripples. You can choose:
    • Off - Don’t display caustics.
    • Triplanar - Sample the caustics along the XY, YX, and XZ planes and blend the three results based on surface normals. This uses triple the number of texture samples compared to the Light Aligned option.
    • Light Aligned - Align the caustics sample to the direction of the main light.
  • Caustics Texture - Texture to use for the caustics.
  • Caustics Tint - Tint applied to the caustics. Use the alpha channel to control the overall strength.
  • Causting Tiling 1 & 2 - How frequently to tile the caustic texture samples. I recommend making these values different, but still relatively close to one another.
  • Caustics Scroll Velocity 1 & 2 - How quickly the caustics scroll over scene objects. I recommend using opposite values on each axis (e.g. if the x-component for one velocity is positive, make the other negative).
  • Caustics Color Separation - How far the individual color channels of the caustics texture get separated. Warning: this will triple the number of texture samples you are already computing.
  • Caustics Start Fade - The distance from the camera where the caustics begin fading out.
  • Caustics Fade Falloff - The distance over which the caustics fade from full to zero strength.