importing LiDAR meshes with the photographic information still intact?

charliebaker

I'm using the iPhone 12 LiDAR scanner and want to bring the results into Bricscad to draw additions on. I had assumed .dae would be the optimal format but can't seem to import it so I can use it, tried .obj and at least it didn't crash the app, but I'm still looking at the outside of an interior. There's some nice clipping tools inside the pointcloud menu set - is there any way of getting to those with a coloured mesh?
this mesh is closed on the outside of the scan as well. I guess just so there was 'somewhere' to apply the imagery to but if makes it very difficult to use.
do i need to redo the scan as a pointcloud and lose all the imagery?
(sorry new to Bricscad after a life on the other side)

Kin

Hi charliebaker,

Welcome to BricsCAD! I assume you are using version 22.2 since you mentioned importing .obj?

This is most unusual importing it via .dae did not seem to work. How big is your file may i ask, and I assume it came with a folder of textures too?

Unfortunately you won't be able to sue those pointcloud functions on meshes (or anything outside a referenced pointcloud format). I am not too sure either if you could export from your LIDAR app to any of these PC formats: LAS, PTX, PTS, RCS, RCP, E57?

Cheers,
Kin

charliebaker

many apologies I only just spotted the alarm bell in the corner - I was assuming I'd get an email notification on someone answering.
if I used the import function .dae is greyed out - it's only 5.4mb but .obj works

Michael Mayer

Which App do you use ?

For now I use Vectorworks "Nomad" iOS/iPadOS App.
It can do Photogrammetry, Point Clouds and "Room Plan" (simple Meshes)

The Point Cloud exports as PTS.
Looks cool in Bricscad but somehow, other to other PTS examples, I cannot
select points !? So no planar or room detection in Bricscad.

Room Plan is absolutely gorgeous.
In AR View it shows white neon edges for any object it detected. It makes only
simple Cubes for Furniture and groups and classifies Objects.
It detects Walls, Doors and Windows quit accurate.
Unfortunately the Mesh geometry is partly so crappy that conversion into Solids
is unrealistic.

The export is either an OBJ, which is quite OK.
Or much better USD !
(Open USD from Pixar, widely adopted and Apple is pushing it heavily for its
Vision Pro)
Unfortunately Bricscad has no USD(A/Z) import.

Michael Mayer

Michael Mayer said:

The Point Cloud exports as PTS.
Looks cool in Bricscad but somehow, other to other PTS examples, I cannot
select points !? So no planar or room detection in Bricscad.

That works now.

Looked like in that file, somehow 3D Snapping "Point Cloud Nearest"
was deactivated for whatever reason.
Second 3D snap marker was default dark blue, non legible in front
of the black background (because orthogonal view and perspective off)

And for planar Face detection, I needed to select more than a single point
in my noisy point cloud and set larger tolerances ....