Solution to the "Unable to convert: true to type: Integer" Error in RayFire

Published on January 08, 2026 | Translated from Spanish
RayFire panel in 3ds Max showing Unable to convert true to type Integer error message with solution applied

The mysterious conversion error in RayFire

This specific Unable to convert: true to type: Integer error is more common than it seems among new RayFire users and usually appears right when you have the most enthusiasm to start virtually destroying things. The message seems technical and confusing, but the solution is usually simpler than it appears.

The error generally indicates a communication problem between RayFire and the PhysX physics system, where some boolean parameter (true/false) is trying to be incorrectly converted to an integer numerical value. This can occur due to incompatible versions, corrupted installations, or conflicting configurations.

In the world of plugins, sometimes true doesn't want to be integer even if you ask nicely

Immediate solutions for the error

Before panicking, try these solutions in order. Most users solve the problem with the first steps, without needing drastic measures.

Specific PhysX configuration

The problem is usually in the PhysX version or configuration. Even if you've installed the recommended version, there may be conflicts with previous installations or system components.

PhysX has the habit of leaving residual files that can interfere with new installations. A complete cleanup is usually more effective than simply reinstalling 😅

Compatibility verification

RayFire is sensitive to both 3ds Max and PhysX versions. An incorrect combination can generate all kinds of unexpected errors, including our famous conversion problem.

Check the official RayFire documentation to confirm exactly which PhysX version you need. Sometimes generic recommendations are not specific enough.

Systematic approach for persistent cases

If the error persists after trying everything above, it's time for a more methodical approach. Sometimes the problem is in deep system configurations or conflicts with other plugins.

Starting with a clean 3ds Max installation can be the definitive solution, although it's the most radical option. Only consider it if the project is urgent and nothing else works.

Prevention for the future

Once the problem is resolved, take measures to prevent it from happening again. Keeping your system organized and updated will save you many future headaches.

Document the steps that worked for you to have a quick reference if the problem reappears after a system or software update.

After applying these solutions, RayFire should work correctly and you can finally focus on what's important: destroying things in a controlled and artistic way 💥