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Messages - ozbigben

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61
General / Re: Importing meshes: workflow options.
« on: June 03, 2014, 12:11:14 AM »
Very nice. The thorns & cross are CAD additions? 

I've been reprocessing some old image sets taken for texturing of laser scans and while I didn't capture enough overlap for creating a complete model (a sculpted head) I got 90% of an object with only a few small gaps behind the ears with a better mesh than our laser scanner. I'll fill in the gaps behind the ears from the laser scan. 

In our case I think it will be better capture the images first and start them processing while the scanning is done. I should have an idea of whether the mesh from PS would be good enough for the project before the scanning is finished, and if there are problem areas, just scan those to blend the meshes.  The processing for the NextEngine on larger objects is pretty slow.

This is a Terragen render of one of our projects (this one was done before we had a laser scanner, using 123D Catch, so we had plenty of images): https://www.flickr.com/photos/123508974@N08/14137654369/

62
General / Re: Texturing problem/question
« on: June 01, 2014, 01:39:05 AM »
If you're getting the same results with generic and ortho there may have been a problem with the model. Have a look at the surface without a texture (does the shape look correct?) and the dense point cloud (are the points close to the resulting surface or is there a lot of variation?)

63
General / Importing meshes: workflow options.
« on: May 31, 2014, 08:59:19 AM »
Back again...
Reprocessing some old images and discovered importing meshes into PS.  As I'm exploring different workflows at the moment I was wondering if anyone would care to share some of the uses they have for importing meshes back into PS.  Some stuff I've tried so far:
  • Exporting dense point cloud and generating a mesh in MeshLab, Poisson reconstruction with a "high" samples per node to create a smoother mesh, import back into PS to generate texture. Not convinced this was entirely practical and my thinking may have been flawed on this one
  • Exporting mesh for editing/smoothing in MeshMixer. My 3D sculpting skills need work too  ;) (https://www.flickr.com/photos/ben-kreunen/14123270998/)
  • (not tried yet) Texturing laser scans.  Photograph object, create dense cloud in PS and export points, align laser scan to PS point cloud in MeshLab, import laser scan into PS and build texture.
While the last one sounds like a lot of extra work, it's not really. Texturing is one of the weak points of the laser scanners we've looked at and manually aligning/painting photographic textures in ZBrush is a lot harder than it looks (to do well)

64
General / Newbie intro
« on: May 31, 2014, 08:35:09 AM »
Hi all

I know I've posted a bit here already but I figured I may as well introduce myself since I'll back hanging around for a while as I learn more.
I'm the Tech Support Officer for a digitisation service in a uni library (http://digitisation.unimelb.edu.au/). While we don't provide a 3D scanning service as such, we do have some equipment to help other departments try stuff out and pass on what we've learnt to help them get their projects up and running faster. So far this has included fields such as archaeology, art (mostly sculpting students) and medicine.

I'm a scientific photographer by qualification, and have been working with spherical panoramas since they were only cylindrical.  One of the great challenges with working in a uni is that no single research group wants to spend a lot of money on scanning equipment and the politics and bureaucracy of sharing means joint purchases are "unusual".

I've been using Photoscan (standard) for a few months, and have also used some of the early stuctured light scanners (cheap camera and projector, awful software), Autodesk's 123D Catch and we currently have a NextEngine with most of the bells and whistles. I've reached the stage where I'm producing some fairly good results thanks to the docs and tips in this forum, but I know i have a lot more to learn.  I tend to think out loud, and ramble a bit (can you tell?  ;)) but I find it's a useful way of sharing ideas. I have the occasional hair-brained idea so please fell free to correct me if my mouth is ahead of my brain.

Cheers

Ben

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