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Author Topic: Black texture  (Read 9193 times)

Clem

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Black texture
« on: March 03, 2016, 12:20:44 PM »
Hi,

I have a very annoying texture problem. Maybe a visualization issue ?

After building texture without any computation errors, the result shows a complete black surface.

How to reproduce:

Use photos from your sample data named "Monument" (32 images) and perform the following actions:

- Import photos -> OK
- Align photo (accuracy: medium, pair selection disabled) -> OK
- Build dense cloude (quality: medium, agressive filtering) -> OK
- Build mesh (arbitrary surface type, medium face count) -> OK
- Build texture (generic mapping, mosaic mode) -> OK (most of the times*)
- Save project -> OK
- Close and open project again -> OK
- Result: all is black...

* Note: Sometimes (seems randomly), the build texture step shows directly a black surface.

Configuration:

Processor: Intel® CoreT i7-4790 CPU @ 3.60GHz × 8
Memory: 16 Go
Graphic card: AMD Radeon HD 6800 Series
OS: Ubuntu 15.10 (64 bit)
Photoscan: 1.2.3

 
You will find in attachments all detailed informations (console log, system information and resulting screenshots).

Thanks for your support.

Alexey Pasumansky

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Re: Black texture
« Reply #1 on: March 03, 2016, 08:35:59 PM »
Hello Clem,

That's look more like some issue with the visualization. Can you check if the smaller texture atlas works fine (like 10k x 10k, 8k x 8k)?
Also I suggest to update the graphic card driver and check whether switching Enable VBO option in the Preferences dialog has any effect for the problematic project.
Best regards,
Alexey Pasumansky,
Agisoft LLC

Clem

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Re: Black texture
« Reply #2 on: March 04, 2016, 06:55:44 PM »
Hello,

My graphic card's drivers are already updates (in attached files).
When I check or uncheck the "Enable VBO", there are no changes on texture.

When you say to "check the smaller texture atlas, 10k*10k", does it mean: to modify "Texture size/count" in the "build texture" step?
(see in attached file).

thanks for your help

Alexey Pasumansky

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Re: Black texture
« Reply #3 on: March 04, 2016, 07:20:17 PM »
Hello Clem,

The settings you are using (on the latest screenshot) mean that there are 10 atlases 10x10 size each.

I meant to use one atlas (1 in the Count field) of 10 000 x 10 000 (10 000 for the size) and check if it works fine or not. And yes, it means rebuilding the texture.
Best regards,
Alexey Pasumansky,
Agisoft LLC

Clem

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Re: Black texture
« Reply #4 on: March 04, 2016, 07:54:04 PM »
hello,

thanks for these precisions!
I've computed again with these parameters.
I saved, close, open, re-closed, re-open, and it works
(see in attached file)...

So what is the problem?

thank you very much

Alexey Pasumansky

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Re: Black texture
« Reply #5 on: March 04, 2016, 07:57:51 PM »
Hello Clem,

I assume that there's some issue with the graphic card that prevents it from working on the max texture size (that is displayed in the beginning of the log in the Console pane). Not sure it is is hardware or driver issue. But probably you can get closer to that value using 12 000 or even 13 000 pixel size atlas.
Best regards,
Alexey Pasumansky,
Agisoft LLC

Clem

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Re: Black texture
« Reply #6 on: March 04, 2016, 08:05:45 PM »
hello,

Aïe...my graphic card could be too old?

I will try with 12 or 13000 pixel size, on biger project.

But, should I use 1 atlas everytime?

thank you