Blender Import Plugin

[vikasTmz]

Todo:

• Import CAO file containing only lines.
• Fix Euler angle for circle primitive.
• Add imported faces to respective tree-view in export plugin.

[fspindle]

• I'm unable to import a cube from following cube.cao file:

  $ more cube.cao 
  V1
  # 3D points
  8                    # Number of points (here 8 cube corners)
  0.000  0.000  0.000 # Point with index 0
  -0.084  0.000  0.000
  -0.084  0.084  0.000
  0.000  0.084  0.000
  0.000  0.000  0.084
  -0.084  0.000  0.084
  -0.084  0.084  0.084
  0.000  0.084  0.084 # point with index 7
  # 3D lines
  0                    # No 3D lines
  # 3D faces from lines
  0                    # No 3D faces from lines
  # 3D faces from points
  6                    # 6 faces to describe the cube
  4 0 4 5 1            # Face with index 0 defined by 3D point 0, 4, 5 and 1
  4 1 5 6 2
  4 6 7 3 2
  4 3 7 4 0
  4 0 1 2 3
  4 7 6 5 4            # Face with index 5
  # 3D cylinders
  0
  # 3D circle
  0                    # No 3D circle

• If I consider the following cube_and_cylinder.caofile, only the cylinder is imported

  $ more cube_and_cylinder.cao
  V1
  # 3D points
  10                   # Number of points
  0.000  0.000  0.000 # Point with index 0
  -0.084  0.000  0.000
  -0.084  0.084  0.000
  0.000  0.084  0.000
  0.000  0.000  0.084
  -0.084  0.000  0.084
  -0.084  0.084  0.084
  0.000  0.084  0.084
  -0.170 -0.030  0.000 # Point with index 8 used to define the cylinder
  -0.170 -0.030  0.250 # Point with index 9 used to define the cylinder
  # 3D lines
  0                    # No 3D lines
  # 3D faces from lines
  0                    # No 3D faces from lines
  # 3D faces from points
  6                    # 6 faces to describe the cube
  4 0 4 5 1            # Face with index 0 defined by 3D point 0, 4, 5 and 1
  4 1 5 6 2
  4 6 7 3 2
  4 3 7 4 0
  4 0 1 2 3
  4 7 6 5 4            # Face with index 5
  # 3D cylinders
  1                    # One 3D cylinder
  8 9 0.04             # Revolution axis between 3D points 8 and 9
  # 3D circle
  0                    # No 3D circle

• Please add visp_cao_import.zip in .gitignore file

[vikasTmz]

I used the following comments to parse the cao file.

# 3D points
0
# 3D lines
0
# Faces from 3D lines
0
# Faces from 3D points
0
# 3D cylinders
0
# 3D circles
0

I did a strict, case insensitive match. Should I also include # 3D faces from lines&# 3D faces from points ?

[fspindle]

A line starting with a # char is a comment. The line should be ignored There could be multiple lines starting with #.

[vikasTmz]

A line starting with a # char is a comment. The line should be ignored There could be multiple lines starting with #.

What I meant was I used the comments mentioned in the previous reply to parse the cao file. So therefore # 3D faces from lines and # 3D faces from points and the data below them were ignored since they did not match # Faces from 3D lines and # Faces from 3D points respectively (I did a strict match).

Hence I asked if I should do a strict, case insensitive match or just see if any keywords like face/from/3d/points/lines are mentioned.

[fspindle]

To be clear, there shouldn't be a case check for keywords after # characters since a line starting with # is an optional comment.

If I consider the previous cube_and_cylinder.cao file, it's content could be the following (without comments):

V1
10                 
 0.000  0.000  0.000
-0.084  0.000  0.000
-0.084  0.084  0.000
 0.000  0.084  0.000
 0.000  0.000  0.084
-0.084  0.000  0.084
-0.084  0.084  0.084
 0.000  0.084  0.084
-0.170 -0.030  0.000 
-0.170 -0.030  0.250 
0                   
0                    
6                   
4 0 4 5 1            
4 1 5 6 2
4 6 7 3 2
4 3 7 4 0
4 0 1 2 3
4 7 6 5 4           
1                    
8 9 0.04         
0            

There could be also sometimes comments on 1 or 2 lines like:

V1
# An other example of
# a cube and a cylinder
# There are 10 3D points
10                 
 0.000  0.000  0.000
-0.084  0.000  0.000
-0.084  0.084  0.000
 0.000  0.084  0.000
 0.000  0.000  0.084
-0.084  0.000  0.084
-0.084  0.084  0.084
 0.000  0.084  0.084
-0.170 -0.030  0.000 
-0.170 -0.030  0.250 
0                   
0                    
6                   
4 0 4 5 1            
4 1 5 6 2
4 6 7 3 2
4 3 7 4 0
4 0 1 2 3
4 7 6 5 4           
1                    
8 9 0.04
# We don't model a circle         
0            

The function that decodes a cao file is vpMbTracker::loadCAOModel(). It's source code is here.

[vikasTmz]

Ok, I made a mistake then. Thanks for the clarification!

[fspindle]

Hi Vikas, even if GSoC is finished do you think that it would be possible for you to integrate my previous comment ?

[vikasTmz]

Yes, I will finish it by this weekend.