FAQ - Revision history

imported>Russ at 04:39, 7 January 2019

2019-01-07T04:39:03Z

← Older revision		Revision as of 21:39, 6 January 2019
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	=== I reported a bug/requested a feature and no one has done anything about it. Why not? ===		=== I reported a bug/requested a feature and no one has done anything about it. Why not? ===

	Unlike some open-source projects, ODE does not have a core group of regular developers. Additions and improvements depend entirely on contributions from the community. While there have been some problems with this approach in the past, the situation is steadily improving. If you would like to join the cause, start by getting the latest source code and then submit a patch ~~([[How to get a patch checked in]])~~.		Unlike some open-source projects, ODE does not have a core group of regular developers. Additions and improvements depend entirely on contributions from the community. While there have been some problems with this approach in the past, the situation is steadily improving. If you would like to join the cause, start by getting the latest source code and then submit a patch.

	=== What units should I use with ODE? ===		=== What units should I use with ODE? ===

imported>Russ at 04:32, 7 January 2019

2019-01-07T04:32:23Z

← Older revision		Revision as of 21:32, 6 January 2019
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	=== I reported a bug/requested a feature and no one has done anything about it. Why not? ===		=== I reported a bug/requested a feature and no one has done anything about it. Why not? ===

	Unlike some open-source projects, ODE does not have a core group of regular developers. Additions and improvements depend entirely on contributions from the community. While there have been some problems with this approach in the past, the situation is steadily improving. If you would like to join the cause, start by getting the latest source code ~~([[Stable Vs Unstable]])~~ and then submit a patch ([[How to get a patch checked in]]).		Unlike some open-source projects, ODE does not have a core group of regular developers. Additions and improvements depend entirely on contributions from the community. While there have been some problems with this approach in the past, the situation is steadily improving. If you would like to join the cause, start by getting the latest source code and then submit a patch ([[How to get a patch checked in]]).

	=== What units should I use with ODE? ===		=== What units should I use with ODE? ===

imported>Russ at 03:42, 7 January 2019

2019-01-07T03:42:50Z

← Older revision		Revision as of 20:42, 6 January 2019
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	ODE models a universe with frictionless hinges and no rolling friction, so problems like those are fairly common.		ODE models a universe with frictionless hinges and no rolling friction, so problems like those are fairly common.

	See the [[Damping HOWTO]].		See the [[HOWTO Damping\|Damping HOWTO]].

	=== My simulation jitters and/or explodes. How do I get a stable simulation? ===		=== My simulation jitters and/or explodes. How do I get a stable simulation? ===

imported>Russ at 03:01, 7 January 2019

2019-01-07T03:01:34Z

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	=== My wheels are sloppy; they don't stay straight when I turn them. ===		=== My wheels are sloppy; they don't stay straight when I turn them. ===

	Assuming that you have already enabled finite rotation mode, and set the correct axis each step, you may be bitten by a problem in the joint angle constraints. If you try to set a stop that's inconsistent (hi < lo, etc), then the setter will silently ignore the data. Thus, if hi and low are set to 0.1, and you want to set them to 0.0, the first call to set hi to 0.0 will fail (beacause lo is 0.1); the call to set lo will succeed, leaving the stops at [0.0,0.1]. The solution is to set the hi, then set the lo, then set the hi again -- this will always work, no matter which direction you're trying to move the stops. Getting a vehicle to behave correctly, including wheel behaviour at high speed, isn't as trivial as expected. Look around for working examples, like Jon Watte's [http://www.mindcontrol.org/~hplus/carworld/ CarWorld] and the leaner [http://www.mindcontrol.org/~hplus/raycar/ RayCar]. See [[HOWTO 4 wheel vehicle]]		Assuming that you have already enabled finite rotation mode, and set the correct axis each step, you may be bitten by a problem in the joint angle constraints. If you try to set a stop that's inconsistent (hi < lo, etc), then the setter will silently ignore the data. Thus, if hi and low are set to 0.1, and you want to set them to 0.0, the first call to set hi to 0.0 will fail (beacause lo is 0.1); the call to set lo will succeed, leaving the stops at [0.0,0.1]. The solution is to set the hi, then set the lo, then set the hi again -- this will always work, no matter which direction you're trying to move the stops. Getting a vehicle to behave correctly, including wheel behaviour at high speed, isn't as trivial as expected. Look around for working examples, like Jon Watte's [http://www.mindcontrol.org/~hplus/carworld/ CarWorld] and the leaner [http://www.mindcontrol.org/~hplus/raycar/ RayCar]. See [[HOWTO build a 4 wheel vehicle]]

	=== How do I come up with the optimum values for the parameters to dHashSpaceSetLevels? ===		=== How do I come up with the optimum values for the parameters to dHashSpaceSetLevels? ===

imported>Russ at 03:00, 7 January 2019

2019-01-07T03:00:59Z

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	=== How do I simulate a wheeled-vehicle? ===		=== How do I simulate a wheeled-vehicle? ===

	Check the [[HOWTO 4 wheel vehicle]] article.		Check the [[HOWTO build a 4 wheel vehicle]] article.

	=== How do I stop my car from flipping over? ===		=== How do I stop my car from flipping over? ===
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	Jon Watte has create an excellent demo called [http://www.mindcontrol.org/~hplus/carworld/ CarWorld]. It is a bit dated and will probably not compile against the latest versions of ODE, but should tell you everything you need to know about creating convincing wheeled vehicles in ODE. He also made a more recent and leaner demo called [http://www.mindcontrol.org/~hplus/raycar/ RayCar].		Jon Watte has create an excellent demo called [http://www.mindcontrol.org/~hplus/carworld/ CarWorld]. It is a bit dated and will probably not compile against the latest versions of ODE, but should tell you everything you need to know about creating convincing wheeled vehicles in ODE. He also made a more recent and leaner demo called [http://www.mindcontrol.org/~hplus/raycar/ RayCar].

	A HOWTO is being set-up here: [[HOWTO 4 wheel vehicle]].		A HOWTO is being set-up here: [[HOWTO build a 4 wheel vehicle]].

	=== Can ODE be used in PS2, Gamecube or XBox games? ===		=== Can ODE be used in PS2, Gamecube or XBox games? ===

imported>Russ at 21:59, 6 January 2019

2019-01-06T21:59:46Z

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	=== In MSVC7 i get the error "error LNK2019: unresolved external symbol __ftol2". ===		=== In MSVC7 i get the error "error LNK2019: unresolved external symbol __ftol2". ===

	Try adding this to the top of ode.~~ccp~~:		Try adding this to the top of ode.cpp:

	#if (_MSC_VER >= 1300) && (WINVER < 0x0500)		#if (_MSC_VER >= 1300) && (WINVER < 0x0500)

imported>Russ at 21:58, 6 January 2019

2019-01-06T21:58:45Z

imported>Russ: Created page with " Add questions and answers here. Longer answers should preferably be broken off into their own pages and referenced via a wiki link. The ODE mailing list has hosted an active..."

2019-01-06T21:54:26Z

Created page with " Add questions and answers here. Longer answers should preferably be broken off into their own pages and referenced via a wiki link. The ODE mailing list has hosted an active..."

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← Older revision		Revision as of 14:58, 6 January 2019
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	=== Is there a working solution for MSVC7? ===		=== Is there a working solution for MSVC7? ===

	There are two methods for building ODE using MSVC7 (.NET) - you can use the project files provided in the contrib/msvc7 directory of the ODE distribution, or you can check out the [[Building ODE with VS.NET]] recipe that takes a command line approach, which fits more naturally with the expected ODE build process. If you take the project file approach, you may find that you need to do a fair amount of tweaking since it may be out of date with the current ODE code structure. Note that you must have OPCODE installed to build the tri-collider version of the MSVC7 project files. '''COMMENT'''~~<nowiki>~~: I built ODE today on VS.NET followin the instructions ~~</nowiki>~~[[Building ODE with MSVC6]], it worked okay. I couldn't build all the samples, but that's only a couple of errors with stdlib etc. I think. I later tried the project files in contrib/msvc7, but they didn't work, I got lots of linker errors.		There are two methods for building ODE using MSVC7 (.NET) - you can use the project files provided in the contrib/msvc7 directory of the ODE distribution, or you can check out the [[Building ODE with VS.NET]] recipe that takes a command line approach, which fits more naturally with the expected ODE build process. If you take the project file approach, you may find that you need to do a fair amount of tweaking since it may be out of date with the current ODE code structure. Note that you must have OPCODE installed to build the tri-collider version of the MSVC7 project files. '''COMMENT''': I built ODE today on VS.NET followin the instructions [[Building ODE with MSVC6]], it worked okay. I couldn't build all the samples, but that's only a couple of errors with stdlib etc. I think. I later tried the project files in contrib/msvc7, but they didn't work, I got lots of linker errors.

	=== In MSVC7 i get the error "error LNK2019: unresolved external symbol __ftol2". ===		=== In MSVC7 i get the error "error LNK2019: unresolved external symbol __ftol2". ===
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	Try adding this to the top of ode.ccp:		Try adding this to the top of ode.ccp:

	~~<nowiki>~~#if (_MSC_VER >= 1300) && (WINVER < 0x0500)		#if (_MSC_VER >= 1300) && (WINVER < 0x0500)
	//VC7 or later, building with pre-VC7 runtime libraries		//VC7 or later, building with pre-VC7 runtime libraries
	extern "C" long _ftol( double ); //defined by VC6 C libs		extern "C" long _ftol( double ); //defined by VC6 C libs
	extern "C" long _ftol2( double dblSource ) { return _ftol( dblSource ); }		extern "C" long _ftol2( double dblSource ) { return _ftol( dblSource ); }
	#endif		#endif
	~~</nowiki>~~

	== Using ODE ==		== Using ODE ==
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	An example of such a system is shown in figure 13, which shows a ball that has just rolled down a ramp and touched the ground.		An example of such a system is shown in figure 13, which shows a ball that has just rolled down a ramp and touched the ground.

	<center>[[Image:Rollingcontact.jpg\|Rollingcontact.jpg]]<br /><br />'''Figure 13'''~~<nowiki>~~: A problem with rolling contact. ~~</nowiki>~~</center>		<center>[[Image:Rollingcontact.jpg\|Rollingcontact.jpg]]<br /><br />'''Figure 13''': A problem with rolling contact.</center>

	Normally, the ball should continue rolling along the ground, towards the right. However, if ODE's default contact friction mode is being used then the ball will come to a complete stop when it hits the ground. Why?		Normally, the ball should continue rolling along the ground, towards the right. However, if ODE's default contact friction mode is being used then the ball will come to a complete stop when it hits the ground. Why?