Second Life Forums Archive - Spiral ramp bug

ArchTx Edo

Mystic/Artist/Architect

Join date: 13 Feb 2005

Posts: 1,993

02-15-2006 08:25

I have made a spiral ramp for one of my houses, its a partially hollow cylinder which is cut to leave a sliver, then the top is twisted to form a ramp that spirals up around 180 degrees.

the ramp is set up where I can walk up it to go upstairs or under it to get to the balcony.

see photo: http://www.pbase.com/cptinrn/image/54675310

The ramp works fine when I first create it. But it eventually converts into an invisible solid that can not be walked under or up. When this happens the slice/cut dimensions are as follows.

begin 0.00 end 0.015

The defective ramp changes back to a proper ramp if I modify the last slice number to make it thicker, like 0.030. Ok I can live with that but what blows my mind is after a little time (few days) the ramp changes its dimensions back to the 0.015 and becomes an invisible solid again. This has happened 3 different times on 3 different houses, all in the same sim.

My partner said she believed this was a known bug. I would like to understand it better so I can avoid having to fix a bunch of broken houses. Any information would be appreciated. I can probably provide anyone who wants it and example of the defectivce ramp, I believe I saved one.

_____________________

VRchitecture Model Homes at http://slurl.com/secondlife/Shona/60/220/30
http://www.slexchange.com/modules.php?name=Marketplace&MerchantID=2240
http://shop.onrez.com/Archtx_Edo

Forseti Svarog

ESC

Join date: 2 Nov 2004

Posts: 1,730

02-15-2006 09:02

wouldn't it be easier just to use a tube, arch?

change revolution to get your spiral, cut it to fit, change x-size to determine platform thickness, y-size to determine inner width, hollow/adv cut if you want built in railing

_____________________

Chosen Few

Alpha Channel Slave

Join date: 16 Jan 2004

Posts: 7,496

02-15-2006 12:12

I've hat this happen with tubes, but never with cylinders before. Definitely bug report this.

_____________________

.

Land now available for rent in Indigo. Low rates. Quiet, low-lag mainland sim with good neighbors. IM me in-world if you're interested.

ArchTx Edo

Mystic/Artist/Architect

Join date: 13 Feb 2005

Posts: 1,993

02-15-2006 13:51

From: Forseti Svarog

wouldn't it be easier just to use a tube, arch?

change revolution to get your spiral, cut it to fit, change x-size to determine platform thickness, y-size to determine inner width, hollow/adv cut if you want built in railing

Thanks, Sounds like a good alternative, I will give it a try.

I did report this under technical problems, I will see if I can find another place to report bugs.

_____________________

VRchitecture Model Homes at http://slurl.com/secondlife/Shona/60/220/30
http://www.slexchange.com/modules.php?name=Marketplace&MerchantID=2240
http://shop.onrez.com/Archtx_Edo

Chosen Few

Alpha Channel Slave

Join date: 16 Jan 2004

Posts: 7,496

02-15-2006 13:54

From: ArchTx Edo

Thanks, Sounds like a good alternative, I will give it a try.

I did report this under technical problems, I will see if I can find another place to report bugs.

The best way to report bugs is inworld. Help -> Report Bug

_____________________

.

Land now available for rent in Indigo. Low rates. Quiet, low-lag mainland sim with good neighbors. IM me in-world if you're interested.

Torley Linden

Enlightenment!

Join date: 15 Sep 2004

Posts: 16,530

02-15-2006 14:20

I've heard of this before, and indeed, I've sent a bug report on it as well--mine was a variation involving a spiralled tube. Everyone who came into contact personally with this, please send a bug report! More info is better.

_____________________

ArchTx Edo

Mystic/Artist/Architect

Join date: 13 Feb 2005

Posts: 1,993

02-17-2006 08:58

I apologize for cross posting this, it was really bugging me at the time and I was looking for quick answers. Here is Strife's great insight into the problem from the technical issues forum.

From: Strife Onizuka

if at all possible, reverse the direction of the twist, this bug only happens on clockwise twist. The issue has to do with the mass functions SL uses, this is actualy a bug fix first released in 1.5. The issue is that the direction of twist effects mass in a non symetic way. Instead of LL fixing this bug, at this point in time they were less interested in fixing the sim crash issue and just spackling over it. You see the the twist could result in the shape becoming a negitive mass. Negitive mass objects on the whole aren't bad just the make things interesting. LL's approuch to fixing negitive mass objects was two fold. If the shape was hollow and it was the hollow face that was resulting in it being negitive mass, then don't apply the hollow subtraction. If the shape was negitive mass before the hollow subtraction, replace the entire bounding box with a basic cube that encompasses the prim entirely.

If you want LL to fix this, the mass calculations for twist need to be fixed.

At the time i had hounded LL to fix the mass functions, as i had created a variety of inside out prims, that by default had negitive mass.

_____________________

VRchitecture Model Homes at http://slurl.com/secondlife/Shona/60/220/30
http://www.slexchange.com/modules.php?name=Marketplace&MerchantID=2240
http://shop.onrez.com/Archtx_Edo

Spiral ramp bug
ArchTx Edo Mystic/Artist/Architect Join date: 13 Feb 2005 Posts: 1,993	02-15-2006 08:25 I have made a spiral ramp for one of my houses, its a partially hollow cylinder which is cut to leave a sliver, then the top is twisted to form a ramp that spirals up around 180 degrees. the ramp is set up where I can walk up it to go upstairs or under it to get to the balcony. see photo: http://www.pbase.com/cptinrn/image/54675310 The ramp works fine when I first create it. But it eventually converts into an invisible solid that can not be walked under or up. When this happens the slice/cut dimensions are as follows. begin 0.00 end 0.015 The defective ramp changes back to a proper ramp if I modify the last slice number to make it thicker, like 0.030. Ok I can live with that but what blows my mind is after a little time (few days) the ramp changes its dimensions back to the 0.015 and becomes an invisible solid again. This has happened 3 different times on 3 different houses, all in the same sim. My partner said she believed this was a known bug. I would like to understand it better so I can avoid having to fix a bunch of broken houses. Any information would be appreciated. I can probably provide anyone who wants it and example of the defectivce ramp, I believe I saved one. _____________________ VRchitecture Model Homes at http://slurl.com/secondlife/Shona/60/220/30 http://www.slexchange.com/modules.php?name=Marketplace&MerchantID=2240 http://shop.onrez.com/Archtx_Edo
Forseti Svarog ESC Join date: 2 Nov 2004 Posts: 1,730	02-15-2006 09:02 wouldn't it be easier just to use a tube, arch? change revolution to get your spiral, cut it to fit, change x-size to determine platform thickness, y-size to determine inner width, hollow/adv cut if you want built in railing _____________________
Chosen Few Alpha Channel Slave Join date: 16 Jan 2004 Posts: 7,496	02-15-2006 12:12 I've hat this happen with tubes, but never with cylinders before. Definitely bug report this. _____________________ . Land now available for rent in Indigo. Low rates. Quiet, low-lag mainland sim with good neighbors. IM me in-world if you're interested.
ArchTx Edo Mystic/Artist/Architect Join date: 13 Feb 2005 Posts: 1,993	02-15-2006 13:51 From: Forseti Svarog wouldn't it be easier just to use a tube, arch? change revolution to get your spiral, cut it to fit, change x-size to determine platform thickness, y-size to determine inner width, hollow/adv cut if you want built in railing Thanks, Sounds like a good alternative, I will give it a try. I did report this under technical problems, I will see if I can find another place to report bugs. _____________________ VRchitecture Model Homes at http://slurl.com/secondlife/Shona/60/220/30 http://www.slexchange.com/modules.php?name=Marketplace&MerchantID=2240 http://shop.onrez.com/Archtx_Edo
Chosen Few Alpha Channel Slave Join date: 16 Jan 2004 Posts: 7,496	02-15-2006 13:54 From: ArchTx Edo Thanks, Sounds like a good alternative, I will give it a try. I did report this under technical problems, I will see if I can find another place to report bugs. The best way to report bugs is inworld. Help -> Report Bug _____________________ . Land now available for rent in Indigo. Low rates. Quiet, low-lag mainland sim with good neighbors. IM me in-world if you're interested.
Torley Linden Enlightenment! Join date: 15 Sep 2004 Posts: 16,530	02-15-2006 14:20 I've heard of this before, and indeed, I've sent a bug report on it as well--mine was a variation involving a spiralled tube. Everyone who came into contact personally with this, please send a bug report! More info is better. _____________________
ArchTx Edo Mystic/Artist/Architect Join date: 13 Feb 2005 Posts: 1,993	02-17-2006 08:58 I apologize for cross posting this, it was really bugging me at the time and I was looking for quick answers. Here is Strife's great insight into the problem from the technical issues forum. From: Strife Onizuka if at all possible, reverse the direction of the twist, this bug only happens on clockwise twist. The issue has to do with the mass functions SL uses, this is actualy a bug fix first released in 1.5. The issue is that the direction of twist effects mass in a non symetic way. Instead of LL fixing this bug, at this point in time they were less interested in fixing the sim crash issue and just spackling over it. You see the the twist could result in the shape becoming a negitive mass. Negitive mass objects on the whole aren't bad just the make things interesting. LL's approuch to fixing negitive mass objects was two fold. If the shape was hollow and it was the hollow face that was resulting in it being negitive mass, then don't apply the hollow subtraction. If the shape was negitive mass before the hollow subtraction, replace the entire bounding box with a basic cube that encompasses the prim entirely. If you want LL to fix this, the mass calculations for twist need to be fixed. At the time i had hounded LL to fix the mass functions, as i had created a variety of inside out prims, that by default had negitive mass. _____________________ VRchitecture Model Homes at http://slurl.com/secondlife/Shona/60/220/30 http://www.slexchange.com/modules.php?name=Marketplace&MerchantID=2240 http://shop.onrez.com/Archtx_Edo

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Spiral ramp bug