Just starting out with three.js and I encountered a strange issue. Whenever the mouse cursor is outside of the content area (for example, if I reload the page and the cursor is on the browser's reload button or outside of the browser window), the object becomes invisible. Any suggestions on what might be causing this problem?
An issue arises when trying to use the variables mouseX and mouseY in the render() function without initializing them first. Since these variables are tied to mouse movement, they remain undefined until the cursor actually enters the screen.
function render() {
....
mesh4.rotation.x = mouseY; //undefined here
mesh4.rotation.y = mouseX; //undefined here
...
}
The values for mouseX and mouseY are only set within the onDocumentMouseMove() function:
function onDocumentMouseMove( event ) {
var windowHalfX = window.innerWidth/2;
var windowHalfY = window.innerHeight;
mouseX = ( event.clientX - windowHalfX ) / 11000; // <-- gets a value here
mouseY = ( event.clientY - windowHalfY ) / 11000; // <-- and here
}
To fix this issue, it is recommended to initialize both variables to zero in the init() function so that they are not undefined during rendering:
function init() {
mouseX = 0;
mouseY = 0;
...
}
You can view the code example on jsfiddle: https://jsfiddle.net/L6c8dhxd/3/
I hope this explanation clarifies the problem.
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