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Merged in MAINT-8066 "Breasts Bounce" increases at low fps. 

Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>
Approved-by: Simon Linden <simon@lindenlab.com>
Approved-by: Maxim Nikolenko <maximnproductengine@lindenlab.com>
master
Andrey Kleshchev 2017-12-11 13:50:24 +00:00
parent fbbac52dd9
commit d86616cc66
1 changed files with 13 additions and 1 deletions
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14
indra/newview/llphysicsmotion.cpp
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@ -44,7 +44,7 @@ typedef std::map<std::string, std::string> controller_map_t;
typedef std::map<std::string, F32> default_controller_map_t;
#define MIN_REQUIRED_PIXEL_AREA_AVATAR_PHYSICS_MOTION 0.f
#define TIME_ITERATION_STEP 0.1f
#define TIME_ITERATION_STEP 0.05f
inline F64 llsgn(const F64 a)
{
@ -549,6 +549,18 @@ BOOL LLPhysicsMotion::onUpdate(F32 time)
// Break up the physics into a bunch of iterations so that differing framerates will show
// roughly the same behavior.
// Explanation/example: Lets assume we have a bouncing object. Said abjects bounces at a
// trajectory that has points A>B>C. Object bounces from A to B with specific speed.
// It needs time T to move from A to B.
// As long as our frame's time significantly smaller then T our motion will be split into
// multiple parts. with each part speed will decrease. Object will reach B position (roughly)
// and bounce/fall back to A.
// But if frame's time (F_T) is larger then T, object will move with same speed for whole F_T
// and will jump over point B up to C ending up with increased amplitude. To avoid that we
// split F_T into smaller portions so that when frame's time is too long object can virtually
// bounce at right (relatively) position.
// Note: this doesn't look to be optimal, since it provides only "roughly same" behavior, but
// irregularity at higher fps looks to be insignificant so it works good enough for low fps.
for (F32 time_iteration = 0; time_iteration <= time_delta; time_iteration += TIME_ITERATION_STEP)
{
F32 time_iteration_step = TIME_ITERATION_STEP;