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allow voxels.js to work on an empty voxel-space

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This commit is contained in:
Seth Alves 2015-07-12 10:35:44 -07:00
parent 2480402515
commit c56b2918a4
1 changed files with 38 additions and 11 deletions
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49
examples/voxels.js
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@ -2,6 +2,32 @@ var controlHeld = false;
var shiftHeld = false;
function attemptVoxelChange(intersection) {
var ids = Entities.findEntities(intersection.intersection, 10);
var success = false;
for (var i = 0; i < ids.length; i++) {
var id = ids[i];
if (controlHeld) {
// hold control to erase a sphere
if (Entities.setVoxelSphere(id, intersection.intersection, 1.0, 0)) {
success = true;
}
} else if (shiftHeld) {
// hold shift to set all voxels to 255
if (Entities.setAllVoxels(id, 255)) {
success = true;
}
} else {
// no modifier key means to add a sphere
if (Entities.setVoxelSphere(id, intersection.intersection, 1.0, 255)) {
success = true;
}
}
}
return success;
}
function mousePressEvent(event) {
if (!event.isLeftButton) {
return;
@ -9,20 +35,21 @@ function mousePressEvent(event) {
var pickRay = Camera.computePickRay(event.x, event.y);
var intersection = Entities.findRayIntersection(pickRay, true); // accurate picking
// var props = Entities.getEntityProperties(intersection.entityID);
// we've used a picking ray to decide where to add the new sphere of voxels. If we pick nothing
// or if we pick a non-PolyVox entity, we fall through to the next picking attempt.
if (intersection.intersects) {
var ids = Entities.findEntities(intersection.intersection, 10);
for (var i = 0; i < ids.length; i++) {
var id = ids[i];
if (controlHeld) {
Entities.setVoxelSphere(id, intersection.intersection, 1.0, 0);
} else if (shiftHeld) {
Entities.setAllVoxels(id, 255);
} else {
Entities.setVoxelSphere(id, intersection.intersection, 1.0, 255);
}
if (attemptVoxelChange(intersection)) {
return;
}
}
// if the PolyVox entity is empty, we can't pick against its voxel. try picking against its
// bounding box, instead.
intersection = Entities.findRayIntersection(pickRay, false); // bounding box picking
if (intersection.intersects) {
attemptVoxelChange(intersection);
}
}