Here are all updates, patches, bug fixes, and build info.

4.0.129

• Updated for the Houdini 21.0.512 production build.
• Fixed a bug where control fields were not being source in properly.
• Supports Houdini 20.0.896, 20.5.654, 20.5.684, 21.0.440, & 21.0.512 on Windows, macOS, & Linux.
• Cuda Version 12.2, Linux Driver 525.60.13+, Windows Driver 525.41+
• Released 27 October 2025
• Download 4.0.128

4.0.128

• Fixed the benchmark node’s python issues.
• Fixed the allocated memory usage labels in the info section of the solver node. Added host memory usage as well.
• Added an option to treat empty voxels as ambient temperature in the buoyancy force.
• Made fetching input sources more efficient.
• Fixed a bug with sinks that caused random blocks to appear in simulations.
• Fixed a bug where the point rasterize node was outputting the source input and not VDBs.
• Fixed a bug where some license keys are reported as invalid during log-in.
• Supports Houdini 20.0.896, 20.5.550, 20.5.584, 20.5.613, 20.5.654, 20.5.684, & 21.0.440 on Windows, macOS, & Linux.
• Cuda Version 12.2, Linux Driver 525.60.13+, Windows Driver 525.41+
• Released 16 October 2025