Caustics Generator - Seamless water textures

Caustics can be described as the light pattern you see at the bottom of a pool on a sunny day.
This tool will let you render such caustics light patterns.

The rendered images are ideal for use in real-time graphics such as games and simulations, but can also be used for architectural renderings, film rendering and advertisement renderings where water needs to be illustrated.


The patterns rendered by this program are calculated by simulating the effect of light refracting through water. The water surface is made tileable in both space and time. This means that you seamlessly can tile individual rendered images both horizontally and vertically. It also means that a full generated animation sequence will loop in time.

The rendered images can for example be used as realtime textures for games and animations but can also be used as light textures for film production, advertising renderings and architectural scene renderings.


The Windows versions of Caustics Generator Lite and Caustics Generator Pro are available for online purchase.

Price includes one year free updates and support.


Unit Price (EUR)

Caustics Generator Lite

Windows (32-bit)

35 EUR

Caustics Generator Pro

Windows (64-bit)

120 EUR

Caustics Generator Pro (Linux)

Linux command line executable for scripting or integration into other tools.
This version does not include a GUI.
170 EUR


All prices are given excluding VAT. Purchases within EU will add VAT.

Invoice orders are available by email for an additional administration fee of 10 Euro.

A receipt of your order will be sent to your stated email address. When your order has been processed you will receive another email with download instructions. If you do not receive the download instructions, check the FAQ for help.

Please visit the Dual Heights Web Shop to buy high quality premade caustics textures.

Program Features

Caustics Generator is available in four versions.

The free version can be downloaded from here and is free for non-commercial use.

There are also three commercial versions available that are aimed for the professional users. See product feature chart below for a comparison between the versions.

Free Lite Pro Linux
Free for non-commercial use mark
Graphical user interface check check check
Command line tool for scripting or integration check check check check
Advanced control over caustics pattern check check check check
Live preview output while changing parameters check check check
Bitmap (BMP) file output check check check check
Commercial use allowed check check check
Animation playback preview check check
Tiling preview check check
Motion blur check check check
High dynamic range image output (EXR) check check
Fast rendering of animations on multi-CPU computers check
Surface height map output check check
Surface normal map output check check
64-bit check check
Image output size limit 512x512 2048x2048 Unlimited Unlimited

Sample Images

Besides the caustics pattern, in Caustics Generator Pro you can also output the water surface as a height map and normal map. While the caustics images are good for lighting, the height map can be used for modelling the water surface and the normal map can be used for surface reflection and refraction effects.

All textures are tileable and loopable in time.

Click on images for a tiled example.

Caustics sample Caustics sample Caustics sample Caustics sample Caustics sample Caustics sample Caustics height map sample Caustics normal map sample

Sample Animation

Click on image to view an animation sequence of a looping caustics rendering.

This example uses 60 frames of rendering at 30 fps playback that is looped five times to create a 10 second animation.

Real-time Demo

run real-time demo »

Read the Unity 3D caustics texturing tutorial if you are interested in how this demo was done.

Caustics Generator GUI screenshot

Application User Interface

The Caustics Generator user interface allows you to play with the parameters that form the caustic pattern.

If you turn on Auto Render, the image is updated live while you change the sliders. In Caustics Generator Pro you can also render and preview the animation directly in the user interface.


You can download caustics generator free of charge from here. The program can be freely used for non-commercial purposes.

release notes »

System Requirements


Windows Vista / 7 / 8
.NET Framework 4.0


Linux 2.6.32