What is an I3D file? An I3D file is a 3D texture created by Houdini, a professional 3D modeling, animation, and rendering program developed by SideFX. It stores volumetric image data representing textures in three-dimensional space, such as smoke, clouds, fire, fog, and other volumetric phenomena within a 3D scene. I3D files are designed to preserve detailed density, color, and lighting information for realistic rendering.

More Information 3D artists, visual effects professionals, and technical directors who need to simulate and render dynamic volumetric effects are the most likely users to encounter I3D files. The format supports large, multi-dimensional datasets, enabling Houdini to accurately visualize and manipulate volumetric phenomena in animations or simulations. By separating texture and volumetric data from the rest of the scene, I3D files allow users to reuse textures across multiple projects or scenes without duplicating resources.