View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0002623 | Spring engine | General | public | 2011-08-24 23:20 | 2011-09-09 10:15 |
| Reporter | abma | Assigned To | jK | ||
| Priority | normal | Severity | feature | Reproducibility | have not tried |
| Status | resolved | Resolution | fixed | ||
| Target Version | 83.0 | ||||
| Summary | 0002623: (master) 3d sound isn't 3d | ||||
| Description | when zooming out, sound is as loud as zoomed in... its 2d-sound! | ||||
| Tags | No tags attached. | ||||
| Checked infolog.txt for Errors | |||||
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it's intentionally, else you wouldn't hear anything at normal zoom levels! https://github.com/spring/spring/blob/b2bc2ed66012b844eee69007f145ed4ba5b853c4/rts/System/Sound/Sound.cpp#L440 |
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hmm, make that configureable? i don't want to hear sounds at low zoom-levels so loud. imo it even sounds better with some air absorption. forum thread related to this report: http://springrts.com/phpbb/viewtopic.php?p=498471#p498471 |
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enable air absorption? |
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i just enabled sound again.. as it was not working for me in master before i updated my whole system. now it does work again. :-) this really is a bug. Even though jk is right, that it should be only marginally or not at all quieter when zooming out, it should be quieter when moving away (in maps 2D space). it currently does not, as in... it is actually 0D (if that makes any sense) -> always the same volume. it works correctly in release. |
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k, could reproduce it. Possibly it is a bug in the OpenALsoft+Linux, cause I couldn't remember such a bug when I wrote the code (and I tested a lot). Explanation what changed between 82.7.1 and master: First we use the following sound distance model: alDistanceModel(AL_INVERSE_DISTANCE_CLAMPED); And OpenAL docs say for it: // gain = 0..1 distance = max(distance,AL_REFERENCE_DISTANCE); distance = min(distance,AL_MAX_DISTANCE); gain = AL_REFERENCE_DISTANCE / (AL_REFERENCE_DISTANCE + AL_ROLLOFF_FACTOR * (distance ÔÇô AL_REFERENCE_DISTANCE)); So what I did (in contrast to 82.7.1) is to introduce a scale factor to transform our spring coords (elmos) into meters that's what OpenAL expects e.g. for DopplerScaling. with such a scaling coeff. the formula becomes: float a = GetElmosInMeters(); gain = (AL_REFERENCE_DISTANCE * a) / ((AL_REFERENCE_DISTANCE * a) + AL_ROLLOFF_FACTOR * ((distance * a) ÔÇô (AL_REFERENCE_DISTANCE * a))); = (AL_REFERENCE_DISTANCE * a) / [a * (AL_REFERENCE_DISTANCE + AL_ROLLOFF_FACTOR * (distance ÔÇô AL_REFERENCE_DISTANCE))]; = (a / a) * AL_REFERENCE_DISTANCE / (AL_REFERENCE_DISTANCE + AL_ROLLOFF_FACTOR * (distance ÔÇô AL_REFERENCE_DISTANCE)); = (a / a) * orig(distance); = orig(distance); --> such a scaling factor doesn't/shouldn't change the sound distance attenuation at all! But when changing GetElmosInMeters() the distance gain changes strangely , with `1` it is similar/same as 82.7.1 and with `1/8` it seems gain is const >1. |
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your math fails somewhat: http://pastebin.com/DYXFjkyM |
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you have a typo in there: (REF_DISTANCE * a) / ((REF_DISTANCE * a) + ROLLOFF_FACTOR * ((d - a) - (REF_DISTANCE * a))) versus (REF_DISTANCE * a) / ((REF_DISTANCE * a) + ROLLOFF_FACTOR * ((d * a) - (REF_DISTANCE * a))) Still the bug is found with the help of KittyCat, commit will come soon. And yeah, it wasn't OpenALsoft's fault (I dropped a magic number I better shouldn't). |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2011-08-24 23:20 | abma | New Issue | |
| 2011-08-24 23:20 | abma | Description Updated | |
| 2011-08-24 23:31 | jK | Note Added: 0007279 | |
| 2011-08-25 01:11 | abma | Note Added: 0007281 | |
| 2011-08-25 01:11 | abma | Severity | minor => feature |
| 2011-08-25 01:21 | abma | Relationship added | related to 0002622 |
| 2011-08-25 01:23 | abma | Note Edited: 0007281 | |
| 2011-08-25 01:29 | abma | Note Edited: 0007281 | |
| 2011-08-25 19:16 | jK | Note Added: 0007292 | |
| 2011-08-27 14:50 | hoijui | Note Added: 0007306 | |
| 2011-09-06 03:06 | abma | Target Version | => 0.83.0 |
| 2011-09-08 07:34 | jK | Note Added: 0007339 | |
| 2011-09-08 07:35 | jK | Note Edited: 0007339 | |
| 2011-09-08 07:36 | jK | Note Edited: 0007339 | |
| 2011-09-08 07:36 | jK | Note Edited: 0007339 | |
| 2011-09-08 07:42 | jK | Note Edited: 0007339 | |
| 2011-09-08 07:42 | jK | Note Edited: 0007339 | |
| 2011-09-08 13:54 | Kloot | Note Added: 0007342 | |
| 2011-09-08 13:54 | Kloot | Status | new => feedback |
| 2011-09-08 14:05 | jK | Note Added: 0007343 | |
| 2011-09-08 14:06 | jK | Note Edited: 0007343 | |
| 2011-09-08 14:06 | jK | Note Edited: 0007343 | |
| 2011-09-08 14:06 | jK | Note Edited: 0007343 | |
| 2011-09-09 10:15 | jK | Status | feedback => resolved |
| 2011-09-09 10:15 | jK | Resolution | open => fixed |
| 2011-09-09 10:15 | jK | Assigned To | => jK |
