Boolean Difference Modifier Operation failing with strange results #56592
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Reference: blender/blender#56592
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System Information
Linux Mint 18.3 & 17.3
Blender Version
Broken: 2.79b 2018-03-22 14:10, Has
f4dc9f9d68& 2.69.Short description of error
Applying boolean modifier (DIFFERENCE) to both bab_piece_7-cl.ply & white_piece_7.ply with same
modifier object bT-cl.ply does not create correct result. In some cases the result is the union, in other cases nothing happens.
This happens also using the python interface scripts. It is strange, as other files with similar operation work correctly.
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
bab.blend:
select bab_piece_7-cl object. attach boolean modifier (Difference) - object Bt-cl. Apply
white.blend:
select white_piece_7 object. attach boolean modifier (Difference) - object Bt-cl. Apply
bab-difference-mesh-bt-2.79.ply
bab.blend
bab_piece_7_difference_bT.ply
bab-difference-carve-bt-2.79.ply
white_piece_7.ply
bT-cl.ply
bab_piece_7-cl.ply
Added subscriber: @NigelKeirRoss
Added subscriber: @mont29
Changed status from 'Open' to: 'Archived'
bad_piece_7 is not a proper geometry for boolean operations, not manifold at all, some stray vertices/edges/faces, some openings... Booleans need a perfectly clean topology to perform correctly. So no bug here, just known limitations of the tools, thanks for the report anyway.
All the meshes submitted here were created using blender & py interface.
Should I submit bugs for them instead?
I don’t see why? Those meshes are not broken or anything, they are just not valid in the Boolean operation context, which has rather strict requirements. It’s user's responsibility to feed booleans with proper geometry.