Specific camera positioning in three.js

Question

Specific camera positioning in three.js

When trying to position the camera in a specific location, I usually move the camera and adjust it accordingly to get the desired coordinates. I then store these values for future reference by utilizing the "update" function.

console.log(camera.position);

After logging the camera's position values as:

x: 2.4457938219139463, y: 0, z: 17.37913738929295

I proceed to update the camera position using the retrieved coordinates next time my application is run:

camera.position.set(2.4457938219139463, 0, 17.947541735897405)
camera.lookAt(scene.position);

However, upon running the code, the camera does not necessarily end up at the exact same position as initially set, instead appearing to be positioned close but not exactly where intended originally.

javascript camera three.js position

Answer 1

Answer №1

One issue arises from the precision of floating point numbers in JavaScript, with 7 digits after the decimal point for a 32-bit operating system and 13 digits after the decimal point for a 64-bit operating system. Therefore, it is important to limit the accuracy to 7 digits and round off when necessary. For example, you can use lat.toFixed(7)/1;

Consider this example:

Code

var x = 2.44579380000034;
var y = 0.0000000000001;

console.log(x);
console.log(x+y);

var x = 0.1;
console.log(x);
console.log(x*x);
console.log(x*x*x);
console.log(x*x*x*x);
console.log(x*x*x*x*x);
console.log(x*x*x*x*x*x);

Output

2.44579380000034
2.4457938000004398

0.1
0.010000000000000002
0.0010000000000000002
0.00010000000000000003
0.000010000000000000004
0.0000010000000000000004

Link to Example

P.S. Learn more about Double-Precision Floating Point Format

Answer 2

One issue arises from the precision of floating point numbers in JavaScript, with 7 digits after the decimal point for a 32-bit operating system and 13 digits after the decimal point for a 64-bit operating system. Therefore, it is important to limit the accuracy to 7 digits and round off when necessary. For example, you can use lat.toFixed(7)/1;

Consider this example:

Code

var x = 2.44579380000034;
var y = 0.0000000000001;

console.log(x);
console.log(x+y);

var x = 0.1;
console.log(x);
console.log(x*x);
console.log(x*x*x);
console.log(x*x*x*x);
console.log(x*x*x*x*x);
console.log(x*x*x*x*x*x);

Output

2.44579380000034
2.4457938000004398

0.1
0.010000000000000002
0.0010000000000000002
0.00010000000000000003
0.000010000000000000004
0.0000010000000000000004

Link to Example

P.S. Learn more about Double-Precision Floating Point Format

Specific camera positioning in three.js

Answer №1

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