Saving XYZRGBA pointcloud to ply results in wrong colors

[b-hahn]

I have a numpy array containing 3 values for XYZ coordinates and one RGBA value - a float32 generated by bitshifting the uint8 values for each color and the alpha value. Unfortunately this does not work since a float32 cannot with precision store the least significant 4 bits, i.e. the A value (or is it the B value? It seems values are actually stored as ARGB when I convert the point cloud back to a numpy array, but that might result from a mistake on my side). The result is that one color channel is lost when I want to save the value as a .ply file. If I'm not making some mistake and the issue is real then one solution would be to use float64 values or allow a uint32 for the RGBA value when calling PointCloud_XYZRGBA.from_array() and not a float32. Happy to hear about any alternative ways to go about saving an RGBA point cloud to .ply files.

[Arnoldnuo]

+1

[sunjay-lee]

+1，is this bug still unsolved?