Messages

1

Feature Requests / Re: Split depth generation as separate task?

« on: March 09, 2012, 04:42:00 AM »

I concur.
Been doing some tests and it was crashing on the mesh gen after 2 hours of waiting. Gave up for now.
Makes no sense to have it all in one all-or-nothing go.
Heck with the free SFM software you have it all in discrete steps.

2

General / Re: working with pattern projection

« on: March 08, 2012, 08:45:49 PM »

yes you are right, i?m exploring that option too... what bothers me about the sl-approach is the bad texture resolution you get when using a webcam (e.g. DAVID-Laserscanner), high priced ccd-cams are not an option for me... not to mention the dimensional limitations of a calibration corner.. i am trying to automate the process with an arduino-controlled stepper and shutter release for sl-scanning with my fuji finepix hs20, taking a photo for each projected pattern... nevertheless this is very time consuming...

Yes, DSLR is the way to go with SL. Much better dynamic range and textures.
WRT calibration corners, ppl have used very large ones, but your scan res is limited to the projector resolution. Laser scanning would get you better res but alas can't be used with a DSLR

3

Bug Reports / Re: ATI HD4XXX and OpenCL errors?

« on: March 07, 2012, 11:53:01 PM »

Hello kosmarnik,

Unfortunately PhotoScan supports ATI Radeon graphic cards starting from 5th series.

It seems so but reading up a bit on other OpenCL projects that have hit the same problem, it could be an easy fix and worth your time.

4

General / Re: working with pattern projection

« on: March 07, 2012, 06:45:41 PM »

If you're reconstructing smaller objects (as long as they fit in your studio), you'll get much better results with a structured-light approach, though shiny/reflective/light absorbant surfaces are a problem (though, you can coat them with a matte coating for perfect results).
SFM approach is better for buildings and large scale 3d reconstruction.

5

Bug Reports / ATI HD4XXX and OpenCL errors?

« on: March 07, 2012, 12:55:15 AM »

Hi,
I'm evaluating PhotoScan and have run into a bug with the hd4870 and OpenCL:

Code: [Select]

error: can't enable all
          OpenCL extensions or unrecognized OpenCL extension
  #pragma OPENCL EXTENSION cl_khr_byte_addressable_store : enable

The initialization seems ok:

Code: [Select]

OpenGL Vendor: ATI Technologies Inc.
OpenGL Renderer: ATI Radeon HD 4800 Series
OpenGL Version: 3.3.11399 Compatibility Profile Context
Maximum Texture Size: 8192
ARB_vertex_buffer_object: supported
ARB_texture_non_power_of_two: supported

I've installed the latest Ati drivers, and after it didn't work even the ATI Stream APP SDK.

Searching a bit on the web if found some possibly relevant info:

Code: [Select]

This happens because the cl_khr_byte_addressable_store extension is not supported by 4000 series cards.

Which basically means you cant use chars the way program wants to, if someone can figure out how to modify the .cl file to use uint types instead of uchar types, then we can eliminate the need for the cl_khr_byte_addressable_store extension to be enabled and get this working on 4000 series cards.