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Merge branch 'master' of github.com:highfidelity/hifi into tablet-ui-tablet-is-overlay

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Seth Alves 2017-02-22 16:50:29 -08:00
commit bcf1f9ab4c
1 changed files with 17 additions and 11 deletions
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28
scripts/system/libraries/WebTablet.js
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@ -49,24 +49,30 @@ function calcSpawnInfo(hand, height) {
var handController = getControllerWorldLocation(hand, true);
var controllerPosition = handController.position;
// compute the angle of the chord with length (height / 2)
var theta = Math.asin(height / (2 * Vec3.distance(headPos, controllerPosition)));
// base of the tablet is slightly above controller position
var TABLET_BASE_DISPLACEMENT = {x: 0, y: 0.1, z: 0};
var tabletBase = Vec3.sum(controllerPosition, TABLET_BASE_DISPLACEMENT);
// then we can use this angle to rotate the vector between the HMD position and the center of the tablet.
// this vector, u, will become our new look at direction.
var d = Vec3.normalize(Vec3.subtract(headPos, controllerPosition));
var d = Vec3.subtract(headPos, tabletBase);
var theta = Math.acos(d.y / Vec3.length(d));
d.y = 0;
if (Vec3.length(d) < 0.0001) {
d = {x: 1, y: 0, z: 0};
} else {
d = Vec3.normalize(d);
}
var w = Vec3.normalize(Vec3.cross(Y_AXIS, d));
var q = Quat.angleAxis(theta * (180 / Math.PI), w);
var ANGLE_OFFSET = 25;
var q = Quat.angleAxis(theta * (180 / Math.PI) - (90 - ANGLE_OFFSET), w);
var u = Vec3.multiplyQbyV(q, d);
// use u to compute a full lookAt quaternion.
var lookAtRot = Quat.lookAt(controllerPosition, Vec3.sum(controllerPosition, u), Y_AXIS);
// adjust the tablet position by a small amount.
var yDisplacement = (height / 2) + 0.1;
var lookAtRot = Quat.lookAt(tabletBase, Vec3.sum(tabletBase, u), Y_AXIS);
var yDisplacement = (height / 2);
var zDisplacement = 0.05;
var tabletOffset = Vec3.multiplyQbyV(lookAtRot, {x: 0, y: yDisplacement, z: zDisplacement});
finalPosition = Vec3.sum(controllerPosition, tabletOffset);
finalPosition = Vec3.sum(tabletBase, tabletOffset);
return {
position: finalPosition,
rotation: lookAtRot