Real-Time Physics Simulation Forum

*nevermind*

I mean that it work exactly the same in that if you don't setUserIndex to anything getUserIndex will be 0... same if you don't setUserPointer, getUserPointer will of course be null.

setUserPointer works exactly the same as index... so I assume you mean like setUserIndex would be 0 if unused... No it doesn't. setUserIndex stores integers. setUserPointer stores void pointers. setUserIndex is only capable of storing one integer per rigid body. I need to store more than one intege...

make a struct that contains the integers's you'd like to save and store that instead? (or actually user pointer instead... or keep an array of those structs and use the int as an index into that struct?) setUserPointer works exactly the same as index... so I assume you mean like setUserIndex would b...

Would be interesting to look at the conversion of operators to methods, wasn't particularly aware at the time of the performance differences for them. Does move a bit away from trying to make things 'match' the c++ bullet code but would be worth it. Array's are always range checked also; moving awa...

From reviews I searched through it looked like bullet was fairly accurate for simulation results. A rope though... depends on exactly how real you want it. If it's a rope of fair length suspending an object, the rope will untwist; there's nothing native that's 'rope'. But I'd imagine it could be sim...

Huh, you're right, there is no multiplication operator between btQuaternion and btVector3 that produces a rotated vector. I think I knew that but had forgotten. Nevertheless it blows my mind each time. This is a terrible omission from the Bullet math library. Perhaps someone in these forums can enl...

in btHingeConstraint.cpp m_useOffsetForConstraintFrame is typically set to true which is used in things like... void btHingeConstraint::getInfo2 (btConstraintInfo2* info) { if(m_useOffsetForConstraintFrame) { getInfo2InternalUsingFrameOffset(info, m_rbA.getCenterOfMassTransform(),m_rbB.getCenterOfMa...

I guess I could evaluate the quaternion code for more confirmation... from the quaternion conversion it looks more like it's row-major. so btVector3 m_el[3]; m_el[0] is the x-axis translation then? which would align with other comments that said it was inversed from opengl method, and why the getope...

Recent sources from github have a function that is childTrans.getOpenGLMatrix(childMat); which does a transpose on the matrix for the result; however, the resulting matrix is never passed to opengl in examples. Instead Identity matrix is used for opengl and the matrix is applied to coordinates as th...

I made too many find and replace errors on a global scale. I feel I need to restart given what I know now about what it needs. Made some errors in conversion where vector*matrix was assumed to be the same as matrix*vector and I can't find them now. Was trying to stick to the original names; bullet X...

So... is the freeze on soft bodies because they keep btVector3& 's? or in your case IndexedVertex3... You know you can add an interface IIndexVector3 which supplies all the methods (except the operators) and use that to keep a reference to a struct? Have to change operators to methods; which I h...

I see... I didn't check that because... XNA. I looked; it's pretty stale; some 3 years behind in updates It is a good resource to answer some of my questions. (like the pointer math comparison which seems pretty arbitrary... the sort comparer in .NET is 1/0/-1 instead of just true/false that the qui...

Out of interest , what are you porting to - saw a few references to c# in your earlier comments. If it's that , then you might want to have a look at : https://code.google.com/p/bullet-xna/ and https://code.google.com/p/bulletsharp/ I did; was unimpressed since they required linking to native code;...

I tried to post my prior message about the algorthm > check several times. If ti starated with or contains the following with two slashses BulletCollision/BroadphaseCollision btBroadphaseProxy.h the post would fail.... Even when editing and trying to put the slash between BroadphaseCollision and btB...