Bitmap Voxel 3D Printing

[impure31]

Hi guys,

Does anybody here on the forum can point me out towards voxel-printing topic related threads on the forum, if any?

Secundo; are there any folks out here with some experience on the subject? 

For those unfamiliar yet interested in the subject; https://www.media.mit.edu/projects/making-data-matter/overview/

A few noob questions regarding voxel-printing in houdini:

1. can you import a stack of png/bmp files in Houdini and create a voxel geometry? 
2. can you import, let's say an stl file, and export it as stack of png/bmp files? 

Final question; Is there anybody out there interested to collaborate on such a Houdini setup? 

Thanks for looking into it,

cheers!

Fred

[Librarian]

MM it's fully possible ...

.ply its Best because of the possibility of exporting color.

Edited November 17, 2019 by Librarian

[Librarian]

Just post here file that you are interested and I'm gonna post mine process with Houdini, Geomagic and Materialise. OK?

[konstantin magnus]

Hi Frederik, this may help you regarding your first question:

 

[konstantin magnus]

Second question regarding converting meshes to image slices: This can be done by converting a mesh to VDBs and sampling the volume to pixel grids like this:

vector pos = set(X, Y, z_slice);
float dens = volumesample(geo, 0, pos);
A = dens;

Say hello to Emily ; ) http://gl.ict.usc.edu/Research/DigitalEmily2/

slice_volumes.hipnc

Edited November 17, 2019 by konstantin magnus

[impure31]

@Librarian yeah, sure just gimme some time. Will do! 

@konstantin magnus that's a great link and file. Will explore  and thanks a million for getting me started with this!!

Thx!
F

[impure31]

@konstantin magnus @Librarian One last thingy for now; any creative ideas on how to turn your greyscale bitmap images into multicolour files? I guess UV's right? Thx! Fred

[Librarian]

nice

https://frederik-de-wilde.com/project/deep-neural-paintings-2/

 

[konstantin magnus]

You can use "volume from attributes" to transfer UV coordinates from meshes to volumes. Reading them into COPs requires several volume samplings:

vector pos = set(X, Y, z_slice);
float u = volumesample(geo, 0, pos);
float v = volumesample(geo, 1, pos);
float w = volumesample(geo, 2, pos);
vector uvw = set(u, v, w);
assign(R, G, B, uvw);

 

slice_volumes_uvw.hipnc

[impure31]

Thank you! @konstantin magnus @Librarian i just wanted to share this app and extension which i found yesterday and can be useful for you both maybe. 

Here you go: https://download.slicer.org and https://github.com/SlicerFab/SlicerFab

Will post some results asap, cheers!
F