Skymatrix and radiance problem

Alakelele · April 10, 2026, 7:00pm

Solution exception:A Radiance installation was found at C:\Radiance\bin
but the Radiance executables are not accessible.
rtrace: system - cannot find function file “rayinit.cal”: No such file or directory

Radiance version used: Release Radiance 6.1a (2026-03-13) · LBNL-ETA/Radiance · GitHub : 6.1a

ZhengrongTao · April 11, 2026, 9:51am

hi,@Alakelele

According to the current Compatibility Matrix, Ladybug Tools is currently not compatible with Radiance 6.1a.

1.4 Compatibility Matrix · ladybug-tools/lbt-grasshopper Wiki

Alakelele · April 13, 2026, 2:51am

Oh no that means I’m gonna have to bug my IT department again.
Thanks

LittleBuddha · April 13, 2026, 9:20am

Hi,

It does work, but it requires some Radiance components that are not included in the Radiance 6 installer.

If you need Radiance 6, I recommend first installing Radiance 5, preferably through the Pollination installer, and then replacing the Radiance components with the updated ones.

If you do not specifically need Radiance 6, I would recommend using Radiance 5.

Best,
LittleBuddha

Alakelele · April 13, 2026, 2:10pm

Sure, danke, 20 characters minimum, gosh