hi all,
 
 I have taken around 10 pictures of a irregular structure (no smooth edges) from all directions.  I have done calibration initially with 4 photos and IM said now the cameras have caliberated. then I have done modelling. when I was creating mask, I dont know why the picture is not visible. pls any one help me out.
 
this is one of the picture I want to model
 
regards,
nanda

Hello Nanda,
 
A workflow for such a project:
1- Get the calibration of all the photographs (you could add some physical markers on the walls and on the floor for example; papers, stick note...).  
2- Add a lot of 3d points (modeling locators) on the statue using the Create Marker Tool in the modeling tab. You need only to place markers in 2 photographs to get a 3d points.
3- Use Create mesh (or create face tool)  and create faces around those locators.
 
Best,
Stef.