Merge 2 models (1 set of picture with object up then 1 set with object down)

Hello there,

My question will be slightly similar to this post (Leon New’s post here) but I’ll try to go further using the lasso tool.

On one hand I took 238 pictures of a cap (this work is done for a Museum). The cap was placed on a rotating stool with a not-neutral background. And I had a satisfying result in 3D:

On the other hand I took 87 pictures of the same cap fliped the other way with the same process and also got a satisfying result (according to our needs):

These are two diffent 3D models from 2 different RC projects. My goal is to merge them to get a unique cap with the inside and the outside of it. Then, I’d like to deleted the white part of the model on each model. I’m trying to do it this way because when I imported the 238 + 87 pictures together, the alignment didn’t work even with added Control Points.

So I’ve exported both camera registration and imported them as components in a new RC project to try to merge both models:

On the new project I created 3 Control points that, I thought were enough to create one only 3D model resulting of the merge of the two other ones:


But when I align the images again, it doesn’t work: 

My assumption is that the white part on each model disturbs the alignment. Maybe if i was able to delete this part, RC would align the model. I used the lasso to select the part I want to delete (or keep) but I wasn’t able to delete it: 

Is there a button that would help me delete a selected region before a model is reconstructed?

Thank you,

Raphaël 

Hi Raphaël,

Nice models!

You are right to suspect the background.

I think for this case there is only masking.

There are one or two threads that deal with exactly this problem.

In addition, you will get problems because your object isn’t rigid and so it will have a different geometry when it’s turned around…

Hi Götz, 

Thank you very much for your quick reply! 

Ok for the masks. Next time I’ll try to have a neutral background to avoid masking it on each picture! 

Have a nice day