I am working on a tool which works with vertex colours. After reading that a semi-standard extension to STL supports colours but they're facet colours instead of vertex colours, I began investigating conversion from facet to vertex for my tool. In order to test it, I generated a test STL file. This all went according to plan, but then when I loaded the STL file into MeshLab, it imported the colours but treated the Materialize 5:5:5 packed colour as BGR instead of RGB. I will attach my sample file, the view of it from viewstl.com, and view of it in MeshLab 2025.07, which I am running on Kubuntu 26.04 Linux.
The screenshot from the
viewstl.comimport.The screenshot from MeshLab 2025.07.
I found one more for good measure. This is 3D-Tool Viewer, running under WINE.
https://github.com/cnr-isti-vclab/meshlab/issues/1671