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Throw held objects with velocity from fingertip

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unknown 2015-09-28 13:04:58 -07:00
parent 2d477ad3b9
commit 5fc7965042
1 changed files with 15 additions and 8 deletions
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23
examples/controllers/handControllerGrab.js
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@ -41,10 +41,10 @@ var LINE_LENGTH = 500;
//
var GRAB_RADIUS = 0.3; // if the ray misses but an object is this close, it will still be selected
var NEAR_GRABBING_ACTION_TIMEFRAME = 0.05; // how quickly objects move to their new position
var NEAR_GRABBING_ACTION_TIMEFRAME = 0.01; // how quickly objects move to their new position
var NEAR_GRABBING_VELOCITY_SMOOTH_RATIO = 1.0; // adjust time-averaging of held object's velocity. 1.0 to disable.
var NEAR_PICK_MAX_DISTANCE = 0.6; // max length of pick-ray for close grabbing to be selected
var RELEASE_VELOCITY_MULTIPLIER = 1.5; // affects throwing things
var RELEASE_VELOCITY_MULTIPLIER = 1.0; // affects throwing things
/////////////////////////////////////////////////////////////////
//
@ -86,7 +86,7 @@ function MyController(hand, triggerAction) {
this.triggerAction = triggerAction;
this.palm = 2 * hand;
// this.tip = 2 * hand + 1; // unused, but I'm leaving this here for fear it will be needed
this.tip = 2 * hand + 1;
this.actionID = null; // action this script created...
this.grabbedEntity = null; // on this entity.
@ -343,7 +343,8 @@ function MyController(hand, triggerAction) {
}
this.currentHandControllerPosition = Controller.getSpatialControlPosition(this.palm);
this.currentHandControllerTipPosition = Controller.getSpatialControlPosition(this.tip);
this.currentObjectTime = Date.now();
};
@ -353,15 +354,21 @@ function MyController(hand, triggerAction) {
return;
}
// keep track of the measured velocity of the held object
var handControllerPosition = Controller.getSpatialControlPosition(this.palm);
// Keep track of the fingertip velocity to impart when we release the object
// Note that the idea of using a constant 'tip' velocity regardless of the
// object's actual held offset is an idea intended to make it easier to throw things:
// Because we might catch something or transfer it between hands without a good idea
// of it's actual offset, let's try imparting a velocity which is at a fixed radius
// from the palm.
var handControllerPosition = Controller.getSpatialControlPosition(this.tip);
var now = Date.now();
var deltaPosition = Vec3.subtract(handControllerPosition, this.currentHandControllerPosition); // meters
var deltaPosition = Vec3.subtract(handControllerPosition, this.currentHandControllerTipPosition); // meters
var deltaTime = (now - this.currentObjectTime) / MSEC_PER_SEC; // convert to seconds
this.computeReleaseVelocity(deltaPosition, deltaTime, true);
this.currentHandControllerPosition = handControllerPosition;
this.currentHandControllerTipPosition = handControllerPosition;
this.currentObjectTime = now;
Entities.callEntityMethod(this.grabbedEntity, "continueNearGrab");
};