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Messages - David Cockey

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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 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

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.

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.

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.

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.

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

General / Re: Difficulty stitching corn field
« on: October 08, 2014, 06:00:17 PM »
Image size of 1616 x 1080 is 1.7 megapixels. Probably not enough resolution given the scale of the corn rows in your photos.

Any particular reason downsampling? If you have the images in the original 14.2 megapixels resolution then try using them.

General / Re: Problem Scanning Small Objects
« on: October 08, 2014, 05:32:23 PM »
Based on my experience a random texture pattern is needed which has a scale of several pixels in the photographs. The pattern drawn on your object is much too large.

General / Re: Making measurements of a 3D Photoscan model
« on: September 25, 2014, 05:10:45 AM »
Rhino3D works for me for meshes up to 20 million faces or so.

General / Re: When to use camera calibrate function?
« on: September 22, 2014, 05:36:26 AM »
newb question: if I use an automatic lens but set it on manual, is the exif information retained or not?
What camera and lens?  Automatic focus, automatic exposure or something else?

Both my Canon cameras always write EXIF information to the image files.

General / Re: Bumpy suface
« on: September 18, 2014, 05:51:19 PM »
I only mask when the background has changes or moves between photos. My experience is a person walking through or a car driving through which only appear on one or two photos do not cause any problems. Also I have not had problems if an object is present in the background but stationary for some of the photos and completely out of other photos with similar alignment.

A stationary background can help alignment.

General / Re: Bumpy suface
« on: September 18, 2014, 05:46:44 PM »
1. Align the photo, dense cloud and build the mesh without any masking
2. The generated mesh is roughly formed

3. Now, select the import mask -> from model! you can see the photos are masked with the rough model but not very fine

This is the part I am unclear about - in order to import masks, I need to have masked all the photos in advance. I though that this method was to avoid making detailed masks? Do you mean > mask the images, then import and build cloud and mesh without the masks first? And then import the detailed masks?

4. Then you can check the photo and edit the mask of each photo manually.

How do I edit masks once they are imported (and the mesh is already made)?

Masks are created, not imported, for each photo based on the existing model when the "from model" option is selected for "Import Masks".

General / Re: Creating line drawings of models - which software to use?
« on: September 13, 2014, 02:10:27 PM »
Thanks David, I'll give that another try! Although last time I worked with PhotoScan imports in Rhino I remember being frustrated about the way Rhino was handling the texture - but perhaps I didn't use OBJ file that time, I'll give it a go!

"Render" viewing mode in Rhino uses directional lighting by default which sometimes can cause portions of a textured object to have dark areas in shadows. I have needed sometimes to adjust th lighting and add additional lights to fill in shadows. 

General / Re: Creating line drawings of models - which software to use?
« on: September 04, 2014, 04:08:09 PM »
Rather than "draw" directly on the imported mesh, I usually create a grid of curves using the Contour command in Rhino and then create the curves I want by snapping to the grid curves.

For Rhino questions try the Rhino forum at > support > Forum or directly at

General / Re: newbie questions - Chunks
« on: September 02, 2014, 06:51:12 PM »
Chunks can be thought of as "mini" projects within a project which can share photos and be aligned relative to each other. There are many uses for chunks. Your example of a church with sculptures and doing a separate chunk for each sculpture is one. Another might be a chunk for each side of a building. If an object has lots of small detail which is captured in many close-up photos then the surface of the object can be split into multiple overlapping chunks to reduce the maximum number of photos per chunk.

It is important to have sufficient overlap between chunks that the chunks can be aligned relative to each other.

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