The proper way to utilize setUserPointer/getUserPointer in Ammo.js is to:
Here's an example of how you could use this method to associate an object with a rigid body:
// Allocate memory for the object you want to associate with the rigid body
var myObject = { x: 1, y: 2, z: 3 };
var objectPtr = Ammo.allocate(Ammo.int16Array, 3);
// Write the object data to the allocated memory
Ammo.writeArrayToMemory([myObject.x, myObject.y, myObject.z], objectPtr);
// Create a rigid body and set the user pointer to the allocated memory
var body = new Ammo.btRigidBody();
body.setUserPointer(objectPtr);
// Retrieve the user pointer whenever you need to access the associated object
var retrievedObject = Ammo.readVector3FromMemory(body.getUserPointer(), 0);
console.log(retrievedObject); // { x: 1, y: 2, z: 3 }
Note that the example above assumes that you're associating an object with the rigid body that consists of three floating-point numbers. If your object is of a different type or size, you will need to adjust the memory allocation accordingly.
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Asked: 2022-08-24 11:00:00 +0000
Seen: 20 times
Last updated: Nov 04 '21
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