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convert grab.js to use spring action. rotation doesn't work right, yet

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This commit is contained in:
Seth Alves 2015-06-08 18:25:58 -07:00
parent eb85f7f818
commit 14a45e8349
3 changed files with 65 additions and 39 deletions
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77
examples/grab.js
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@ -20,6 +20,7 @@ var ANGULAR_DAMPING_RATE = 0.40;
// NOTE: to improve readability global variable names start with 'g'
var gIsGrabbing = false;
var gGrabbedEntity = null;
var gActionID = null;
var gPrevMouse = {x: 0, y: 0};
var gEntityProperties;
var gStartPosition;
@ -193,6 +194,7 @@ function mousePressEvent(event) {
var cameraPosition = Camera.getPosition();
gBeaconHeight = Vec3.length(entityProperties.dimensions);
print("gBeaconHeight = " + gBeaconHeight);
gMaxGrabDistance = gBeaconHeight / MAX_SOLID_ANGLE;
if (Vec3.distance(objectPosition, cameraPosition) > gMaxGrabDistance) {
// don't allow grabs of things far away
@ -231,6 +233,8 @@ function mouseReleaseEvent() {
}
gIsGrabbing = false
Entities.deleteAction(grabbedEntity, gActionID);
gActionID = null;
Overlays.editOverlay(gBeacon, { visible: false });
@ -250,6 +254,8 @@ function mouseMoveEvent(event) {
gOriginalGravity = entityProperties.gravity;
}
var actionArgs;
if (gGrabMode === "rotate") {
var deltaMouse = { x: 0, y: 0 };
var dx = event.x - gPreviousMouse.x;
@ -259,9 +265,12 @@ function mouseMoveEvent(event) {
var dragOffset = Vec3.multiply(dx, Quat.getRight(orientation));
dragOffset = Vec3.sum(dragOffset, Vec3.multiply(-dy, Quat.getUp(orientation)));
var axis = Vec3.cross(dragOffset, Quat.getFront(orientation));
var axis = Vec3.normalize(axis);
var ROTATE_STRENGTH = 8.0; // magic number tuned by hand
gAngularVelocity = Vec3.multiply(ROTATE_STRENGTH, axis);
// var axis = Vec3.normalize(axis);
// var ROTATE_STRENGTH = 8.0; // magic number tuned by hand
// gAngularVelocity = Vec3.multiply(ROTATE_STRENGTH, axis);
var targetRotation = Quat.angleAxis(Vec3.length(axis), Vec3.normalize(axis));
actionArgs = {targetRotation: targetRotation, angularTimeScale: 1.0};
} else {
var newTargetPosition;
if (gGrabMode === "verticalCylinder") {
@ -284,9 +293,18 @@ function mouseMoveEvent(event) {
}
}
gTargetPosition = Vec3.sum(newTargetPosition, gGrabOffset);
actionArgs = {targetPosition: gTargetPosition, linearTimeScale: 0.1};
}
gPreviousMouse = { x: event.x, y: event.y };
gMouseCursorLocation = { x: Window.getCursorPositionX(), y: Window.getCursorPositionY() };
if (!gActionID) {
gActionID = Entities.addAction("spring", gGrabbedEntity, actionArgs);
} else {
Entities.updateAction(gGrabbedEntity, gActionID, actionArgs);
}
updateDropLine(gTargetPosition);
}
function keyReleaseEvent(event) {
@ -309,38 +327,37 @@ function keyPressEvent(event) {
computeNewGrabPlane();
}
function update(deltaTime) {
if (!gIsGrabbing) {
return;
}
// function update(deltaTime) {
// if (!gIsGrabbing) {
// return;
// }
var entityProperties = Entities.getEntityProperties(gGrabbedEntity);
gCurrentPosition = entityProperties.position;
if (gGrabMode === "rotate") {
gAngularVelocity = Vec3.subtract(gAngularVelocity, Vec3.multiply(gAngularVelocity, ANGULAR_DAMPING_RATE));
Entities.editEntity(gGrabbedEntity, { angularVelocity: gAngularVelocity, });
}
// var entityProperties = Entities.getEntityProperties(gGrabbedEntity);
// gCurrentPosition = entityProperties.position;
// if (gGrabMode === "rotate") {
// gAngularVelocity = Vec3.subtract(gAngularVelocity, Vec3.multiply(gAngularVelocity, ANGULAR_DAMPING_RATE));
// Entities.editEntity(gGrabbedEntity, { angularVelocity: gAngularVelocity, });
// }
// always push toward linear grab position, even when rotating
var newVelocity = ZERO_VEC3;
var dPosition = Vec3.subtract(gTargetPosition, gCurrentPosition);
var delta = Vec3.length(dPosition);
if (delta > CLOSE_ENOUGH) {
var MAX_POSITION_DELTA = 4.0;
if (delta > MAX_POSITION_DELTA) {
dPosition = Vec3.multiply(dPosition, MAX_POSITION_DELTA / delta);
}
// desired speed is proportional to displacement by the inverse of timescale
// (for critically damped motion)
newVelocity = Vec3.multiply(dPosition, INV_MOVE_TIMESCALE);
}
Entities.editEntity(gGrabbedEntity, { velocity: newVelocity, });
updateDropLine(gTargetPosition);
}
// // always push toward linear grab position, even when rotating
// var newVelocity = ZERO_VEC3;
// var dPosition = Vec3.subtract(gTargetPosition, gCurrentPosition);
// var delta = Vec3.length(dPosition);
// if (delta > CLOSE_ENOUGH) {
// var MAX_POSITION_DELTA = 4.0;
// if (delta > MAX_POSITION_DELTA) {
// dPosition = Vec3.multiply(dPosition, MAX_POSITION_DELTA / delta);
// }
// // desired speed is proportional to displacement by the inverse of timescale
// // (for critically damped motion)
// newVelocity = Vec3.multiply(dPosition, INV_MOVE_TIMESCALE);
// }
// Entities.editEntity(gGrabbedEntity, { velocity: newVelocity, });
// }
Controller.mouseMoveEvent.connect(mouseMoveEvent);
Controller.mousePressEvent.connect(mousePressEvent);
Controller.mouseReleaseEvent.connect(mouseReleaseEvent);
Controller.keyPressEvent.connect(keyPressEvent);
Controller.keyReleaseEvent.connect(keyReleaseEvent);
Script.update.connect(update);
// Script.update.connect(update);

4
libraries/physics/src/ObjectActionPullToPoint.cpp
View file

@ -28,6 +28,10 @@ ObjectActionPullToPoint::~ObjectActionPullToPoint() {
}
void ObjectActionPullToPoint::updateAction(btCollisionWorld* collisionWorld, btScalar deltaTimeStep) {
if (!_ownerEntity) {
qDebug() << "ObjectActionPullToPoint::updateAction no owner entity";
return;
}
if (!tryLockForRead()) {
// don't risk hanging the thread running the physics simulation
return;

5
libraries/physics/src/ObjectActionSpring.cpp
View file

@ -28,6 +28,10 @@ ObjectActionSpring::~ObjectActionSpring() {
}
void ObjectActionSpring::updateAction(btCollisionWorld* collisionWorld, btScalar deltaTimeStep) {
if (!_ownerEntity) {
qDebug() << "ObjectActionSpring::updateAction no owner entity";
return;
}
if (!tryLockForRead()) {
// don't risk hanging the thread running the physics simulation
return;
@ -111,6 +115,7 @@ bool ObjectActionSpring::updateArguments(QVariantMap arguments) {
if (rtOk) {
_rotationalTarget = rotationalTarget;
_rotationalTargetSet = true;
if (rscOk) {
_angularTimeScale = angularTimeScale;