73i

.73i — Rend3D (formally RISC 3D) File

RISC, Inc. · 1995

Developer

RISC, Inc.

Key Features

Stores complete 3D scene data
Includes geometry, materials, and lighting
Proprietary binary format
Primarily used with Rend3D software

Best For

Users of the Rend3D software
Archiving specific 3D scenes created in Rend3D
Maintaining compatibility with older Rend3D projects

Less Ideal For

Cross-platform 3D model exchange
Web-based 3D applications
Modern 3D game development
High-fidelity rendering with advanced shaders

Common Use Cases

Storing 3D models created in Rend3D
Archiving 3D scenes for later rendering
Sharing 3D project data between Rend3D users
Preserving older 3D graphics project files

How to Open It

The primary method is to use the original Rend3D software if you have access to it.
Look for specialized 3D modeling software that may have import capabilities for older or obscure formats; however, direct support for .73i is rare.
If the file is a text-based representation or can be converted by Rend3D, explore export options to more common formats like OBJ or FBX.

What is a .73i file?

The .73i file extension is associated with Rend3D, a 3D modeling and rendering software developed by RISC, Inc. originally in the mid-1990s. These files store 3D scene information, including geometry, textures, lighting, and camera data. Rend3D was designed for creating and manipulating complex 3D models and animations, particularly for professional design and visualization purposes. Although less common today, these files represent a snapshot of early 3D graphics technology and can still be opened with compatible software.

Programs That Open .73i Files

Platform	Program
Windows	Rend3D	Paid	Official

How to Convert .73i Files

Format	Method
.OBJ	Rend3D software (if export is supported)
.FBX	Rend3D software (if export is supported)

Common Problems with .73i Files

⚠️ Cannot open .73i file due to lack of Rend3D software.

Search for specialized 3D conversion tools or forums that might offer assistance with older or proprietary formats. Alternatively, if you know someone who used Rend3D, ask if they can convert the file for you.

⚠️ File data appears corrupted or unreadable.

This could be due to incomplete download, storage issues, or a problem during the file's creation. Try obtaining the file again if possible. If it's an old archive, it might have degraded.

Frequently Asked Questions

Is .73i a common file format for 3D models?▼

No, the .73i format is specific to Rend3D software and is not widely used or supported by most modern 3D applications.

Can I open a .73i file on any computer?▼

You can typically only open .73i files with the original Rend3D software. Opening it on other systems without Rend3D installed or without a converter is usually not possible.

What kind of data is stored in a .73i file?▼

.73i files store the complete data for a 3D scene, including the shapes of objects, their surface materials and textures, lighting conditions, and camera viewpoints.

Technical Details

Rend3D files (.73i) are proprietary binary files. They contain structured data describing the elements of a 3D scene, which can include polygon meshes, NURBS surfaces, material properties, texture map references, light sources, and camera configurations. The specific internal structure is not publicly documented, typical of commercial software from that era.

Did You Know?

The .73i format emerged during a period when 3D graphics were transitioning from specialized workstations to more mainstream personal computers.

RISC, Inc., the developer of Rend3D, also created other graphics software and hardware solutions in its time.

Security Information

As a proprietary binary format, .73i files are generally safe, but as with any file, exercise caution if downloading from untrusted sources. Malicious code is typically associated with executable files, not 3D model data, but it's always best practice to scan files from unknown origins.