[Bug] Missing color property

barvirm commented 4 weeks ago

Loader

Las loader

Description

I'm trying to load the attached LAS file, but the RGB information seems to be missing—all the colors are showing as [0,0,0,255]. However, I know the color data is present because the colors display correctly when I open the file with LiDARView using the RGB settings.

Model: https://mega.nz/file/T4VGyCwC#B0D_F4Cp9LU7mJrQgpJgf3s7NxGB8x84MkGy78QkeKs

Expected Behavior

Model with colors

Steps to Reproduce

const bytes = readFile("path");
const data = parseSync(bytes, LASLoader);

const colors = data.attributes['COLOR_0'];
// All colors are [0, 0, 0, 255]

Environment

Framework version: loaders.gl@4.2.5
Browser: Chrome 129
Node: 20.13
OS: Windows 11

Logs

No response

ibgreen commented 4 weeks ago

Thanks for reporting.

The LAS loader is a wrapper around a compiled WASM library so loaders.gl is just trying to interpret and package the output of that rather opaque code.
If you could do some debugging by putting breakpoints in the loader and see if there is information coming from the WASM code that is not being forwarded by the JavaScript wrapper, that would be very helpful.

Color is extracted here https://github.com/visgl/loaders.gl/blob/master/modules/las/src/lib/parse-las.ts#L44

barvirm commented 3 weeks ago

On the line 144: https://github.com/visgl/loaders.gl/blob/e4946a503c1ec0460363c834e4e9c386c91ee98b/modules/las/src/lib/parse-las.ts#L114

Colors on the right side are: [20224, 21504, 16384, ...] but on the loader output I have colors [0,0,0,255, ...].

visgl / loaders.gl