5d8b0649be
make it easier to tweak and consistent with Godot Physics. Include patch applied to Bullet master to enable dampings greater than 1.
35 lines
2 KiB
Diff
35 lines
2 KiB
Diff
diff --git a/thirdparty/bullet/BulletDynamics/Dynamics/btRigidBody.cpp b/thirdparty/bullet/BulletDynamics/Dynamics/btRigidBody.cpp
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index 9e8705b001..f1b50b39c8 100644
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--- a/thirdparty/bullet/BulletDynamics/Dynamics/btRigidBody.cpp
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+++ b/thirdparty/bullet/BulletDynamics/Dynamics/btRigidBody.cpp
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@@ -136,8 +136,13 @@ void btRigidBody::setGravity(const btVector3& acceleration)
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void btRigidBody::setDamping(btScalar lin_damping, btScalar ang_damping)
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{
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- m_linearDamping = btClamped(lin_damping, (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
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- m_angularDamping = btClamped(ang_damping, (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
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+#ifdef BT_USE_OLD_DAMPING_METHOD
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+ m_linearDamping = btMax(lin_damping, btScalar(0.0));
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+ m_angularDamping = btMax(ang_damping, btScalar(0.0));
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+#else
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+ m_linearDamping = btClamped(lin_damping, btScalar(0.0), btScalar(1.0));
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+ m_angularDamping = btClamped(ang_damping, btScalar(0.0), btScalar(1.0));
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+#endif
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}
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///applyDamping damps the velocity, using the given m_linearDamping and m_angularDamping
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@@ -146,10 +151,9 @@ void btRigidBody::applyDamping(btScalar timeStep)
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//On new damping: see discussion/issue report here: http://code.google.com/p/bullet/issues/detail?id=74
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//todo: do some performance comparisons (but other parts of the engine are probably bottleneck anyway
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-//#define USE_OLD_DAMPING_METHOD 1
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-#ifdef USE_OLD_DAMPING_METHOD
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- m_linearVelocity *= GEN_clamped((btScalar(1.) - timeStep * m_linearDamping), (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
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- m_angularVelocity *= GEN_clamped((btScalar(1.) - timeStep * m_angularDamping), (btScalar)btScalar(0.0), (btScalar)btScalar(1.0));
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+#ifdef BT_USE_OLD_DAMPING_METHOD
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+ m_linearVelocity *= btMax((btScalar(1.0) - timeStep * m_linearDamping), btScalar(0.0));
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+ m_angularVelocity *= btMax((btScalar(1.0) - timeStep * m_angularDamping), btScalar(0.0));
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#else
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m_linearVelocity *= btPow(btScalar(1) - m_linearDamping, timeStep);
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m_angularVelocity *= btPow(btScalar(1) - m_angularDamping, timeStep);
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