Texturing problems during Shape Fusion.

[IvanTikhonov]

Hello everyone!
I did several scans of an object and faced a strange bug when I've tried to fuse the scans.
When I am fusing first two scans everything works fine, but when I am trying to add third one only part of a texture is being applied to the model, other areas are being covered with grey color.
I have attached two screenshots - before and after fusion.
Please help me with finding a way to solve this problem.

Best regards,
Ivan.

P.S: My David software version is 3.8.1

[WalterMo]

Hi Ivan,

How does the fused object look if you switch off the texture? Is it complete?
You can use e.g. the key 't'.

Walter

[IvanTikhonov]

Hi Walter,

Here's a screenshot of a fusion result with texture off.

[WalterMo]

That's strange.
In the folder where the single OBJ files are saved are also the related PNG files of the texture. Are they all ok?

[IvanTikhonov]

I've checked PNG files.
If I got the idea right when you are merging two scans David creates a new PNG file that has textures from both of scans used in the fusion process.
It works when I am fusing Scan 1 and Scan 2 (see attachment 1), but when I am trying to fuse Scan 3 with the result of first fusion it creates a PNG file that only has a texture from Scan 3 (see attachment 2).

[WalterMo]

Ivan,
You only should fuse an object one time, not scan 1 with scan 2 and then this result with scan 3 and so on!
Align all the done single scans, like here the head of a man:
http://wiki.david-3d.com/david3_user_manual/overview
….and then fuse all to one object together. Forget the single textures, DAVID will handle them in the right way. The fused object comes as a „large“ OBJ file and the texture will be one PNG file where all the single textures are placed side by side. Like here the scan of a bulb (Sept 24, 2009) :
viewtopic.php?p=8326#p8326

Walter

PS. Just before you start the fusion let DAVID do in Shape Fusion a final 'Global Fine Registration'. Then all the single scans will be optimal aligned one to each other.

[Sven]

Walter is right.
Details:
For Fusion with textures, each item in the List of Scans must be ONE scan made from ONE perspective, not a Fusion result. For each item in the list, DAVID must estimate the ONE camera position from where the scan was made - that's impossible with an already fused model.

Sven

[hunkatibor2]

Hi Sven
The phenomenon also comes up here. Foals are the Ultimate Rescue. So occurs on others. Someone to deal with this error:
Error type: tracks, bumps
Tibor

[Sven]

Sorry, Tibor, I have no idea what you mean. Lost in translation...
Sven

[IvanTikhonov]

Thank you Walter and Sven, I've managed to get great result fusing all scans simultaneously.
Next time I should be more attentive while reading manuals.

Best regards,
Ivan

[hunkatibor2]

Hi Sven
Ivan you experience an error, the wavy surface
Tibor an error occurs, the wavy surface.
What is common to both cases of the software.
I should find the cause of the error.
Tibor