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faster move and max solid angle for distant grabs

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This commit is contained in:
Andrew Meadows 2015-06-08 16:59:33 -07:00
parent ffeac220f9
commit ef1e3aae00
1 changed files with 14 additions and 9 deletions
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23
examples/grab.js
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@ -10,9 +10,9 @@
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
var MOVE_TIMESCALE = 0.05;
var MOVE_TIMESCALE = 0.1;
var INV_MOVE_TIMESCALE = 1.0 / MOVE_TIMESCALE;
var MAX_GRAB_DISTANCE = 100;
var MAX_SOLID_ANGLE = 0.01; // objects that appear smaller than this can't be grabbed
var CLOSE_ENOUGH = 0.001;
var ZERO_VEC3 = { x: 0, y: 0, z: 0 };
var ANGULAR_DAMPING_RATE = 0.40;
@ -28,6 +28,9 @@ var gCurrentPosition;
var gOriginalGravity = ZERO_VEC3;
var gPlaneNormal = ZERO_VEC3;
// gMaxGrabDistance is a function of the size of the object.
var gMaxGrabDistance;
// gGrabMode defines the degrees of freedom of the grab target positions
// relative to gGrabStartPosition options include:
// xzPlane (default)
@ -112,7 +115,7 @@ function mouseIntersectionWithPlane(pointOnPlane, planeNormal, event) {
var useMaxForwardGrab = false;
if (Math.abs(dirDotNorm) > MIN_RAY_PLANE_DOT) {
var distanceToIntersection = distanceFromPlane / dirDotNorm;
if (distanceToIntersection > 0 && distanceToIntersection < MAX_GRAB_DISTANCE) {
if (distanceToIntersection > 0 && distanceToIntersection < gMaxGrabDistance) {
// ray points into the plane
localIntersection = Vec3.multiply(pickRay.direction, distanceFromPlane / dirDotNorm);
} else {
@ -129,7 +132,7 @@ function mouseIntersectionWithPlane(pointOnPlane, planeNormal, event) {
// we re-route the intersection to be in front at max distance.
var rayDirection = Vec3.subtract(pickRay.direction, Vec3.multiply(planeNormal, dirDotNorm));
rayDirection = Vec3.normalize(rayDirection);
localIntersection = Vec3.multiply(rayDirection, MAX_GRAB_DISTANCE);
localIntersection = Vec3.multiply(rayDirection, gMaxGrabDistance);
localIntersection = Vec3.sum(localIntersection, Vec3.multiply(planeNormal, distanceFromPlane));
}
var worldIntersection = Vec3.sum(cameraPosition, localIntersection);
@ -188,7 +191,10 @@ function mousePressEvent(event) {
var entityProperties = Entities.getEntityProperties(clickedEntity)
var objectPosition = entityProperties.position;
var cameraPosition = Camera.getPosition();
if (Vec3.distance(objectPosition, cameraPosition) > MAX_GRAB_DISTANCE) {
gBeaconHeight = Vec3.length(entityProperties.dimensions);
gMaxGrabDistance = gBeaconHeight / MAX_SOLID_ANGLE;
if (Vec3.distance(objectPosition, cameraPosition) > gMaxGrabDistance) {
// don't allow grabs of things far away
return;
}
@ -212,7 +218,6 @@ function mousePressEvent(event) {
computeNewGrabPlane();
gBeaconHeight = Vec3.length(entityProperties.dimensions);
updateDropLine(objectPosition);
// TODO: play sounds again when we aren't leaking AudioInjector threads
@ -272,9 +277,9 @@ function mouseMoveEvent(event) {
newTargetPosition = mouseIntersectionWithPlane(gPointOnPlane, gPlaneNormal, event);
var relativePosition = Vec3.subtract(newTargetPosition, cameraPosition);
var distance = Vec3.length(relativePosition);
if (distance > MAX_GRAB_DISTANCE) {
if (distance > gMaxGrabDistance) {
// clamp distance
relativePosition = Vec3.multiply(relativePosition, MAX_GRAB_DISTANCE / distance);
relativePosition = Vec3.multiply(relativePosition, gMaxGrabDistance / distance);
newTargetPosition = Vec3.sum(relativePosition, cameraPosition);
}
}
@ -321,7 +326,7 @@ function update(deltaTime) {
var dPosition = Vec3.subtract(gTargetPosition, gCurrentPosition);
var delta = Vec3.length(dPosition);
if (delta > CLOSE_ENOUGH) {
var MAX_POSITION_DELTA = 0.50;
var MAX_POSITION_DELTA = 4.0;
if (delta > MAX_POSITION_DELTA) {
dPosition = Vec3.multiply(dPosition, MAX_POSITION_DELTA / delta);
}