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104 lines
3.5 KiB
JavaScript
104 lines
3.5 KiB
JavaScript
// Creates a large number of entities on the cardinal planes of the octree (all
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// objects will live in the root octree element). Measures how long it takes
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// to update the properties of the first and last entity. The difference
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// between the two measurements shows how the cost of lookup changes as a
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// function of the number of entities. For best results run this in an
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// otherwise empty domain.
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var firstId;
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var lastId;
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var NUM_ENTITIES_ON_SIDE = 25;
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// create the objects
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createObjects = function () {
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var STRIDE = 0.75;
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var WIDTH = 0.5;
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var DIMENSIONS = { x: WIDTH, y: WIDTH, z: WIDTH };
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var LIFETIME = 20;
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var properties = {
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name: "",
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type : "Box",
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dimensions : DIMENSIONS,
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position : { x: 0, y: 0, z: 0},
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lifetime : LIFETIME,
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color : { red:255, green: 64, blue: 255 }
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};
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// xy
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var planeName = "xy";
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for (var i = 0; i < NUM_ENTITIES_ON_SIDE; ++i) {
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for (var j = 0; j < NUM_ENTITIES_ON_SIDE; ++j) {
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properties.name = "Box-" + planeName + "-" + i + "." + j;
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properties.position = { x: i * STRIDE, y: j * STRIDE, z: 0 };
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var red = i * 255 / NUM_ENTITIES_ON_SIDE;
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var green = j * 255 / NUM_ENTITIES_ON_SIDE;
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var blue = 0;
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properties.color = { red: red, green: green, blue: blue };
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if (i == 0 && j == 0) {
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firstId = Entities.addEntity(properties);
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} else {
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Entities.addEntity(properties);
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}
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}
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}
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// yz
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var planeName = "yz";
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for (var i = 0; i < NUM_ENTITIES_ON_SIDE; ++i) {
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for (var j = 0; j < NUM_ENTITIES_ON_SIDE; ++j) {
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properties.name = "Box-" + planeName + "-" + i + "." + j;
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properties.position = { x: 0, y: i * STRIDE, z: j * STRIDE };
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var red = 0;
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var green = i * 255 / NUM_ENTITIES_ON_SIDE;
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var blue = j * 255 / NUM_ENTITIES_ON_SIDE;
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properties.color = { red: red, green: green, blue: blue };
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Entities.addEntity(properties);
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}
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}
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// zx
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var planeName = "zx";
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for (var i = 0; i < NUM_ENTITIES_ON_SIDE; ++i) {
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for (var j = 0; j < NUM_ENTITIES_ON_SIDE; ++j) {
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properties.name = "Box-" + planeName + "-" + i + "." + j;
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properties.position = { x: j * STRIDE, y: 0, z: i * STRIDE };
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var red = j * 255 / NUM_ENTITIES_ON_SIDE;
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var green = 0;
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var blue = i * 255 / NUM_ENTITIES_ON_SIDE;
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properties.color = { red: red, green: green, blue: blue };
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lastId = Entities.addEntity(properties);
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}
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}
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};
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createObjects();
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// measure the time it takes to edit the first and last entities many times
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// (requires a lookup by entityId each time)
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changeProperties = function (id) {
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var newProperties = { color : { red: 255, green: 255, blue: 255 } };
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Entities.editEntity(id, newProperties);
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}
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// first
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var NUM_CHANGES = 10000;
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var firstStart = Date.now();
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for (var k = 0; k < NUM_CHANGES; ++k) {
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changeProperties(firstId);
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}
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var firstEnd = Date.now();
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var firstDt = firstEnd - firstStart;
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// last
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var lastStart = Date.now();
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for (var k = 0; k < NUM_CHANGES; ++k) {
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changeProperties(lastId);
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}
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var lastEnd = Date.now();
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var lastDt = lastEnd - lastStart;
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// print the results
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var numEntities = 3 * NUM_ENTITIES_ON_SIDE * NUM_ENTITIES_ON_SIDE;
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print("numEntities = " + numEntities + " numEdits = " + NUM_CHANGES + " firstDt = " + firstDt + " lastDt = " + lastDt);
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