Raycast problem with SpriteMaterial.sizeAttenuation set to false

Hi Friends!

SpriteMaterial.sizeAttenuation = false

seems not working as expected with rayCaster. I doubt the sprite size(dimension) estimation may be a little bit off, ray is very hard to hit them after apply scale(), especially scale down. I can upload a simplified code that regenerate this problem a bit later.

• r96

Browser

• All of them

Thanks!

[Mugen87]

Should be solved via #16423

[WestLangley]

The following pattern can be used as a workaround to prevent size attenuation, and still support raycasting. Leave sprite.sizeAttenuation = true;

// raycasting against sprites when using a perspective camera only works correctly when sizeAttanuation is true (r.97)
var onBeforeRender = function () {

	var v = new THREE.Vector3();
	var v1 = new THREE.Vector3();

	return function onBeforeRender( renderer, scene, camera ) {

		var factor = 0.05; // optional

		v.setFromMatrixPosition( this.matrixWorld );
		v1.setFromMatrixPosition( camera.matrixWorld );

		var f = v.sub( v1 ).length() * factor;
		this.scale.x = this.userData.originalScale.x * f;
		this.scale.y = this.userData.originalScale.y * f;

	}

}();

sprite.userData.originalScale = new THREE.Vector3().copy( sprite.scale ); // optional

sprite.onBeforeRender = onBeforeRender;

Modify this pattern to accommodate your use case.