OsSlerp
From OpenSimulator
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float ratio; | float ratio; | ||
rot_a = rot_b; | rot_a = rot_b; | ||
− | rot_b = llEuler2Rot(<llFrand(PI), llFrand(PI), llFrand(PI)>) | + | rot_b = llEuler2Rot(<llFrand(PI), llFrand(PI), llFrand(PI)>); |
integer counter = 10; | integer counter = 10; | ||
Latest revision as of 14:21, 2 January 2021
rotation osSlerp(rotation a, rotation b, float ratio);
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Slerp is shorthand for spherical linear interpolation, introduced by Ken Shoemake in the context of quaternion interpolation for the purpose of animating 3D rotation.
It refers to constant-speed motion along a unit-radius great circle arc, given the ends and an interpolation parameter between 0 and 1. osSlerp Returns a rotation that is the spherical interpolation of a and b, according to ratio that can be from 0.0 (result is a) to 1.0 (result is b) | |
Threat Level | None |
Permissions | Use of this function is always allowed by default |
Extra Delay | 0 seconds |
Example(s) | |
// // osSlerp Script Example // Author: djphil // rotation rot_a; rotation rot_b; default { state_entry() { llSay(PUBLIC_CHANNEL, "Touch to see osSlerp usage."); } touch_start(integer number) { float ratio; rot_a = rot_b; rot_b = llEuler2Rot(<llFrand(PI), llFrand(PI), llFrand(PI)>); integer counter = 10; do { ratio += 0.1; llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_ROTATION, osSlerp(rot_a, rot_b, ratio)]); llSleep(0.1); } while(--counter); } } With a couple of scripts: // // osSlerp Script Example // Author: djphil // key target = "1209ffb3-3d27-4f77-bf09-d1da8bd36093"; default { state_entry() { llSay(PUBLIC_CHANNEL, "Touch the blue primitive to see osSlerp usage."); llSetColor(<0.0, 0.5, 1.0>, ALL_SIDES); } touch_start(integer number) { rotation rot = llEuler2Rot(<llFrand(PI), llFrand(PI), llFrand(PI)>); llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_ROTATION, rot]); osMessageObject(target, (string)rot); } } // // osSlerp Script Example // Author: djphil // rotation rot_a; rotation rot_b; default { state_entry() { llSay(PUBLIC_CHANNEL, "Touch the blue primitive to see osSlerp usage."); llSetColor(<1.0, 0.0, 1.0>, ALL_SIDES); } dataserver(key uuid, string data) { float ratio; rot_a = rot_b; rot_b = (rotation)data; integer counter = 10; do { ratio += 0.1; llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_ROTATION, osSlerp(rot_a, rot_b, ratio)]); llSleep(0.1); } while(--counter); } } A more complex example: // // osSlerp Script Example // Author: Kayaker Mangic Sept 2019 // // This isn't the right way to wiggle a stick (llSetKeyframedMotion is better) but it does demostrate osSlerp working! // Put this script in a prim that is long in the X direction, it will wave it's tip around in a figure 8 (infinity) pattern. rotation lastrot; // slerp between these two rotations rotation nextrot; // slerp between these two rotations float t = 0.0; // parameter for calculating angles to slerp between float ratio = 1.0; // does 10 slerp steps of 0.1 between last and next integer switch; default { state_entry() { llSay(PUBLIC_CHANNEL, "Touch to see osSlerp usage."); } touch_start(integer number) { if (switch = !switch) { llSetTimerEvent(1.0); } else { llSetTimerEvent(0.0); } } timer() { integer counter = 10; while(--counter) { ratio += 0.1; if (ratio > 1.0) { ratio = 0.1; // start over lastrot = nextrot; // save the last rotation t += PI / 10.0; // bump t to generate points on a Lissajous curve float y = llSin(t); // this will generate points around an float z = llSin(2.0 * t); // infinity sympol vector fwd = llVecNorm(<2.0, y, z>); // tip of this vector carves out the shape vector lft = llVecNorm(<0.0, 0.0, 1.0> % fwd); // convert that into a rotation nextrot = llAxes2Rot(fwd, lft, fwd % lft); // this will be the next rotation to slerp to } rotation rot = osSlerp(lastrot, nextrot, ratio); llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_ROTATION, rot]); llSleep(0.09); } } } | |
Notes | |
Implemented Sept, 2019 by Ubit Umarov |