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