{
  'Business Unit': ['Platform'],
  'Date of First Response': '2014-11-12T13:30:29.308-0600',
  'How would you like the feature to work?': "This is being copied over from SCR-373\r\n\r\nThis proposal is for a new data-type for {{llSetKeyframedMotion()}}'s {{KFM_DATA}} option, entitled {{KFM_BEZIER_INTERPOLATION}}.\r\n\r\nThe additional data type adds an extra {{rotation}} to each keyframe that is interpreted as a [bezier curve|http://en.wikipedia.org/wiki/Bezier_curve], described by the four points; P0=<0,0>, P1=<x,y>, P2=<z,s> and P3=<1,1>.\r\n\r\nUsing the bezier curve the key framed animation is able to determine how quickly or slowly to apply the interpolation between position and/or rotation. Specifically, the percentage time elapsed for the keyframe is treated as X, and fed into the curve to gain access to Y, which will describe the extent of the translation at that point. Using bezier curves it is possible to create smoothed transitions that accelerate, decelerate or both, allowing us to create natural movement with only a handful of keyframes; currently it is only possible to create smooth looking animations by adding multiple keyframes to simulate an acceleration or deceleration phase, however a bezier curve would allow this to be done with infinite precision, and with far greater simplicity for the scripter, and far less complexity for the simulator (no need for complex workarounds).\r\n\r\nIf not specified the default behaviour would be {{BEZIER_LINEAR}}, with other useful constants defined below (minus {{KFM_}} prefix as they may be useful [elsewhere|https://jira.secondlife.com/browse/SCR-325]):\r\n||Constant||Value||\r\n|{{BEZIER_LINEAR}}|{{<0.0, 0.0, 1.0, 1.0>}}|\r\n|{{BEZIER_EASE}}|{{<0.25, 0.1, 0.25, 1.0}}|\r\n|{{BEZIER_EASE_IN}}|{{<0.42, 0.0, 1.0, 1.0>}}|\r\n|{{BEZIER_EASE_OUT}}|{{<0.0, 0.0, 0.58, 1.0>}}|\r\n|{{BEZIER_EASE_IN_OUT}}|{{<0.42, 0.0, 0.58, 1.0>}}|\r\n\r\n*Examples*:\r\n{code:title=Launcher}default {\r\n    state_entry() {\r\n        llSetKeyframedMotion(\r\n            [ // Keyframes\r\n                <0.0, 0.0, 10.0>,  BEZIER_EASE_OUT,    1.0,  // Launch\r\n                <0.0, 0.0, -10.0>, BEZIER_EASE_IN,     1.0,  // Fall\r\n                <0.0, 0.0, 0.5>,   BEZIER_EASE_IN_OUT, 0.25, // Unconvincing bounce up\r\n                <0.0, 0.0, -0.5>,  BEZIER_EASE_IN,     0.25, // Fall to start position\r\n            ],\r\n            [ // Options\r\n                KFM_DATA, KFM_TRANSLATION | KFM_BEZIER_INTERPOLATION\r\n            ]\r\n        );\r\n    }\r\n\r\n    touch_start(integer x) {\r\n        llSetKeyframedMotion([], [KFM_COMMAND, KFM_CMD_PLAY]);\r\n    }\r\n}{code}\r\n\r\n{code:title=Smooth Mover}default {\r\n    state_entry() {\r\n        llSetKeyframedMotion(\r\n            [ // Keyframes\r\n                <10.0, 0.0, 0.0>,  BEZIER_EASE_IN_OUT, 5.0,\r\n                <-10.0, 0.0, 0.0>, BEZIER_EASE_IN_OUT, 5.0\r\n            ],\r\n            [ // Options\r\n                KFM_DATA, KFM_TRANSLATION | KFM_BEZIER_INTERPOLATION,\r\n                KFM_MODE, KFM_LOOP,\r\n                KFM_COMMAND, KFM_CMD_PLAY\r\n            ]\r\n        );\r\n    }\r\n}{code}\r\n\r\nFor a good source to see what bezier-curves make possible, take a look at the [CSS3 animation-timing-function|http://www.w3schools.com/cssref/css3_pr_animation-timing-function.asp].",
  'Severity': 'Unset',
  'Target Viewer Version': 'viewer-development',
  'Why is this feature important to you? How would it benefit the community?': 'This would be a very useful capability for key-framed motion, as it eliminates the need to add additional frames in order to perform smoothing, as the curves can be used to produce smoothing far more easily.',
}