yang686526

3d solid reading as disconnected solids
3d solid reading as disconnected solids
hello,
i have implemented reading of 3d solids, regions, bodys and surfaces using the approach of calling decomposeforsave as was suggested on this forum. this obviously has limitations.
one limitation is that after a 3d solid of multiple disconnected parts is decomposed, it cannot be made into solids from the parts, since one solid may produce mutliple surfaces, and for multiple solids, the surface parts are mixed together and not associated with each disconnected solid. is there a way, other than acis parsing, to access disconnected solids as separate breps?
this occurs with regions, as well, since they may store multiple disconnected sufaces. both a single surface, and multiple disconnected surfaces may decompose into multiple surfaces, so i cannot tell how many surfaces there are, or which parts are for each one.
thanks for any suggestions about this,
regan
decomposeforsave() creates meshes from 3dsolids.
instead of acis parsing you can use brep interface.
see oddb3dsolid::brep() function and \include\br folder.
sergey slezkin
thank you for your reply. the brep looks interesting. i want to understand the complex brep.
the documenation says:
complexes are comprised of one or more connected shell boundaries,
and correspond to connected regions of points in 3d space.
does this mean that i can traverse the brep of a region made of two disconnected parts, and get two complex breps. similarly, can i use this to traverse a the brep of a multiple part oddb3dsolid, so that each complex brep is forms the boundary of each solid part?
thanks again,
regan
hi,
could you please attach file with region made of two disconnected parts or 3dsolid with multiply disconnected parts ?
here is a region with two disconnected parts as an example.
attached files (28.8 kb, 1 views)

hi,
traversers use acis brep topology, so you can traverse via coplex part too.
regarding to your example file... you can check for multi part using odbr classes, next call explode command on complex region. explode will generate two simple regions... and decomposeforsave.