Opened 11 years ago
Closed 11 years ago
#2937 closed defect (fixed)
defects in polyhedra, 3d-gfan rendering
Reported by: | mhampton | Owned by: | mhampton |
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Priority: | major | Milestone: | sage-3.0.2 |
Component: | geometry | Keywords: | polyhedra, convex hull, polytope, gfan |
Cc: | Merged in: | ||
Authors: | Reviewers: | ||
Report Upstream: | Work issues: | ||
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description (last modified by )
Currently there are major issues in polyhedra.py (see #2844), which also affect 3d rendering of Groebner gfans - for example, the following doesn't work:
sage: R4.<x,y,z,w> = PolynomialRing(QQ,4) sage: idnp = R4.ideal([x*y*z+x^2*z-x*y,x*w^2-z,x*w^4+x*z]) sage: gfnp = idnp.groebner_fan() sage: a = gfnp.render3d()
I (Marshall Hampton) am actively fixing these issues but I don't have a patch yet. There are two main problems: 1) I didn't handle unbounded polyhedra well (which is what causes the above problem) and 2) properties such as facial_incidences can be wrong because of vertex reordering by cddlib. I should have a patch that fixes those problems and adds some rendering enhancements by 5/1/2008 (or earlier).
Change History (3)
comment:1 Changed 11 years ago by
- Status changed from new to assigned
comment:2 Changed 11 years ago by
- Description modified (diff)
comment:3 Changed 11 years ago by
- Resolution set to fixed
- Status changed from assigned to closed
This issue has been fixed by merging #2716:
[22:34] <mhampton> mabshoff: I just figured out why I was confused. #2716 took long enough to get in that you had me rebase it, and I put in stuff that I had meant for #2937 [22:34] <-- roed has left this server (Read error: 110 (Connection timed out)). [22:34] <mhampton> So #2937 can be closed
Cheers,
Michael
Once again, this time with feeling!:
Currently there are major issues in polyhedra.py (see #2844), which also affect 3d rendering of Groebner gfans - for example, the following doesn't work:
I (Marshall Hampton) am actively fixing these issues but I don't have a patch yet. There are two main problems: 1) I didn't handle unbounded polyhedra well (which is what causes the above problem) and 2) properties such as facial_incidences can be wrong because of vertex reordering by cddlib. I should have a patch that fixes those problems and adds some rendering enhancements by 5/1/2008 (or earlier).