View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0002222 | FSSCP | models | public | 2010-06-10 00:43 | 2012-12-22 21:28 |
| Reporter | FUBAR-BDHR | Assigned To | Valathil | ||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | not fixable | ||
| Product Version | 3.6.12 RC2 | ||||
| Summary | 0002222: Large ships collide without ever touching | ||||
| Description | This seems to have started somewhere between r5099 and r5149. Ships are now colliding and pushing each other without ever colliding. Sometimes even over 100 meters away from each other. You can even fly between the colliding ships, see the collision effect and here the sound as well. | ||||
| Additional Information | Tested with builds off of r5149 and a current trunk build with no modifications (r6198). First noticed in TBP where a passenger liners rotation was pushing a Nova down on it's Z axis while it was sitting still. Found in a Diaspora mission and just confirmed using retail data. Retail mission attached. Apparently this was not present in r5099 (didn't test myself but was told the bug did not happen with that build) | ||||
| Tags | No tags attached. | ||||
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2010-06-10 00:43
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OK seems I was lied to about it not existing in 6099. This goes back until at least 3.6.10 RC3. I do not remember it happening during Zathras development as the test mission I initially saw it on was specifically for testing ship engines. Pretty sure I would have seen a ship right in front of me moving down instead of forward. Unfortunately I no longer have that version of that mission. It's possible they were hitting and it just wasn't moving down. |
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2010-06-10 08:53
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I tried to follow this from the code side but couldn't really figure out what exactly was the problem. I sorta traced the problem into 'fvi_polyedge_sphereline' function in math/fvi.cpp in vertex check section. |
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Are you able to narrow it down between revisions? That would probably be easier than narrowing it down code-wise. |
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Both test missions have huge capital ships close together. THIS SHOULD NOT HAPPEN IN THIS ENGINE. The collision code isn't equipped to handle collisions of two things of similar size. The effects of that are magnified the bigger the two ships are so you don't see much problems with fighters but two capital ships this close is a big nono. I'm in favor of closing this, this issue would require a complete rewrite of the collision code. Why the "bug" emerged at a specific revision? Probably somebody fixed a real bug and that caused the proper behavior to show. |
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There is one situation where two ships are that close: kamikaze. In FS1, in sm2-05, the Mauler (an Aten) collides with the Galatea (an Orion). And in FS2, in sm1-10, it is possible for the Colossus's beams to miss frequently enough for the Repulse to collide with it. |
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Those are head on collisions which is a completely different matter cause collisions are pretty accurate in the engine when the bow of the smaller ship is on the sphere boundary of the collision bubble. What im talking about is close formation flight like in the test mission. If you had two borg spheres flying this close together the collisions would be perfect but cylindrical ships are a different thing and faulty collisions are to expected cause the engine is just not written to handle that. |
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Without any objections it seems. Closing this bug as not fixable at least without a complete rewrite of the collision code. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2010-06-10 00:43 | FUBAR-BDHR | New Issue | |
| 2010-06-10 00:43 | FUBAR-BDHR | File Added: 0collision.fs2 | |
| 2010-06-10 06:37 | FUBAR-BDHR | Note Added: 0012055 | |
| 2010-06-10 08:53 | FUBAR-BDHR | File Added: 0collision2.fs2 | |
| 2010-06-10 13:20 | Wanderer | Note Added: 0012056 | |
| 2010-06-13 08:36 | Goober5000 | Note Added: 0012064 | |
| 2012-12-13 23:04 | Valathil | Note Added: 0014439 | |
| 2012-12-14 16:46 | Goober5000 | Note Added: 0014456 | |
| 2012-12-14 17:48 | Valathil | Note Added: 0014458 | |
| 2012-12-22 21:28 | Valathil | Note Added: 0014563 | |
| 2012-12-22 21:28 | Valathil | Status | new => closed |
| 2012-12-22 21:28 | Valathil | Assigned To | => Valathil |
| 2012-12-22 21:28 | Valathil | Resolution | open => not fixable |
