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Messages - David Cockey

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1
The Windows X64 installer file for 1.4.2 downloaded as a .txt file, not as a .msi file. I changed the file type to .msi and the installer successfully ran.

2
General / Re: Ultra wide lens choice
« on: November 17, 2016, 06:14:55 PM »
I've gotten excellent results with Photoscan using a Canon EF-S 10-22 mm zoom lens on a "crop" sensor Canon camera (16-35 mm full frame equivalent). On a couple of boat projects there was very limited space around and under the boats and capturing the boats would not have been feasible without the very wide angle. Photoscan determined the lens distortion coefficient and corrected the lens distortion in the same manner it does for any lens.

Obviously the Canon lens isn't an option to use with on your Nikon camera. Before purchasing the Canon lens I considered the the other lens mentioned above. I would go with one with 11 mm minimum focal length rather than 16 mm. The difference in angle of view is huge. Also my recollection is one has more "complex" distortion which might be more difficult for Photoscan to completely correct.

3
General / Re: Agisoft PhotoScan 1.2.0 pre-release
« on: October 01, 2015, 06:39:32 PM »
Computer locks up when attempting to trim a mesh with 52 million faces.
No problems creating the mesh or decimating down to 5 million faces.

PhotoScan Standard Edition Version 1.2.0 build 2158 (64bit)
Windows 7
Intel i7-3770 3.40 GHz
16GB RAM
AMD Radeon HD 7770 GPU 2GB memory
AMD driver 14.501.1003.0

Added:

Updated graphics driver to latest version from AMD website 15.200.1062.1004

With the large mesh the system appears to be moving data in and out of C drive which is a 100 GB SSD with 18.3 GB free. System has two other large internal drives, both of which have lots of free space.

Trimming the decimated 5 million face mesh works fine.


4
General / Re: Photoscan Peformance on Dell server without GPU
« on: September 29, 2015, 04:00:29 AM »
Just slower than the same machine with a high speed GPU. But it may be faster than some machines with GPU.

5
General / Re: Workflow with calibrated camera
« on: June 07, 2015, 05:56:26 AM »
Potential reasons the earlier calibration may not be exactly correct for the project photos:

1)  Lens was focused at a much closer distance for the calibration photos than for the project photos. The difference in focusing means lens elements moved relative to each other and/or the sensor. The effective focal length may be slightly different and the distortion may be slightly different.

2)  If the lens has Image Stabilization was IS turned off for both sets of photos? Even if IS was turned off for both sets of photos were the IS elements in exactly the same position for both sets of photos. IS works by the IS elements moving to shift the image on the sensor to counteract camera movement. Unless the elements are in exactly the same position the image will be shifted slightly.

3) Temperature differences might cause lens elements to move slightly.

6
Bug Reports / Re: No model displayed.
« on: March 28, 2015, 05:21:41 AM »
Switched to using Nvidia graphics for rendering and problem solved. Thanks for the help.

7
Bug Reports / Re: No model displayed.
« on: March 28, 2015, 05:17:24 AM »
Currently using the Intel graphics rather than Nvidia for rendering. I will figure out how to use Nvidia graphics.

Agisoft PhotoScan Version: 1.1.4 build 2021 (64 bit)
OpenGL Vendor: Intel
OpenGL Renderer: Intel(R) HD Graphics 4600
OpenGL Version: 4.3.0 - Build 10.18.10.3960
Maximum Texture Size: 16384
Quad Buffered Stereo: not enabled
ARB_vertex_buffer_object: supported
ARB_texture_non_power_of_two: supported
Loading project...
loaded project in 12.298 sec
Finished processing in 12.298 sec (exit code 1)

8
Bug Reports / Re: No model displayed.
« on: March 27, 2015, 08:12:02 PM »
I'll check on the driver and update if not the latest.

The mesh which causes the problem had over 15 million faces, was generated from dense cloud of 7 million points. I created the mesh again and problem reoccurred. Starts as soon as I try to look at the mesh.

Closed and restarted photoscan. Created a mesh from another chunk in same file (Low vs Med for dense cloud generation). 2.3 million points and 5.4 faces. Works fine.

"Switch to model view by default" is on. I'll turn it off but assume problem will still occur when I try to look at mesh.

9
Bug Reports / Re: No model displayed.
« on: March 27, 2015, 07:53:53 PM »
Problem started immediately after generating mesh. Close PhotoScan and reopen with the same file and error messages start appearing.

Delete the mesh and save as a new file. Close PhotoScan and reopen with the new file. Works okay.

10
Bug Reports / No model displayed.
« on: March 27, 2015, 07:45:25 PM »
Display of the model in PhotoScan has stopped.  Standard Edition, Version 11.4 build 2021 (64 bit).  NVIDIA GeForce GT 740M Driver 9.18.13.4725 1/9.2015  System has been restarted and problem remains.

Examples of log messages:


renderer_gl.cpp line 535: glDrawElements(encodePrimitiveType(type), (GLsizei) countElements(type, chunk), encodeFormat(ibuffer->format), (GLvoid *) ((char *) indices + offset)) failed, error 1285

renderer_gl.cpp line 121: glClearColor((color & 0xFF) / 255.f, ((color >> 8) & 0xFF) / 255.f, ((color >> 16) & 0xFF) / 255.f, 0.0f) failed, error 1285

renderer_gl.cpp line 506: glDrawArrays(encodePrimitiveType(type), (GLsizei) offset, (GLsizei) countElements(type, count)) failed, error 1285

11
General / Re: Not Enough memory
« on: March 09, 2015, 04:56:14 AM »
One approach to too many photos and not enough memory is to break the project into chunks with shared photos in each chunk. Align Photos requires the least memory so align all the photos together, or break into the fewest number of chunks needed to align. Then Align Chunks using the align by photos option. Then break the project into smaller chunks, again sharing photos between chunks, for creating the dense cloud and meshing.

This is my standard procedure when working with projects involving up to 2000 photos on a computer with 16GB of memory.

12
General / Re: Dealing with DOF
« on: February 20, 2015, 09:14:43 PM »
"Sharpening" in Photoshop, etc does not increase the information in the photo. It just adjusts the contrast gradient locally to give the appearance of a sharper image.

My experience  is that PhotoScan is not very sensitive to slight blurring, and ignores badly blurred areas.

13
General / Re: Best F-stop?
« on: February 20, 2015, 09:09:05 PM »
Adjust camera to subject distance so that the size of the subject in the image is the same, and the depth of field will be about the same for different focal lengths if the f-stop is the same.

14
General / Re: Best camera for Photoscan?
« on: January 17, 2015, 06:37:09 AM »
What type of subjects will you be photographing?  Aerial photography has different needs than photos of static objects with a stationary camera. Indoor or outdoor? How large are the subjects? Stationary or moving camera? Stationary or moving subjects?

Rolling shutter is not an issue with photos of static objects with a stationary camera.

15
Cars usually are very difficult to scan due to glossy surfaces without visual texture.  Try a stone, piece of wood, tree trunk, etc.

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