three.js: Sprite: Raycasting with offscreen sprites fails

Description of the problem

A user in the forum reported a bug in Sprite.raycast().

https://discourse.threejs.org/t/problematic-raycasting-of-offscreen-three-sprite-object/3644

The method depends on Object3D.modelViewMatrix. But this matrix is only updated if the sprite is actually rendered. If not, modelViewMatrix does not regard the actual object’s transformation. This means that Sprite.raycast() detects intersections of sprites outside the view frustum.

https://github.com/mrdoob/three.js/blob/1ffaa41a4b5f053ad62da1682844b53b041e63ca/src/objects/Sprite.js#L99

Three.js version

• Dev
• r95
• …

Browser

• All of them
• Chrome
• Firefox
• Internet Explorer

OS

• All of them
• Windows
• macOS
• Linux
• Android
• iOS

Hardware Requirements (graphics card, VR Device, …)