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Strae/check_if_entity_is_in_the_viewport.js

Created November 15, 2017 11:20
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Aframe entity in viewport / visible
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check_if_entity_is_in_the_viewport.js
//RETURNS TRUE/FALSE BASED ON WHETHER OR NOT THE ENTITY IS VISIBLE
checkIfVisible(entity, camera){
let entityMesh = entity.object3DMap.mesh;
let frustum = new THREE.Frustum();
let cameraViewProjectionMatrix = new THREE.Matrix4();
camera.updateMatrixWorld();
camera.matrixWorldInverse.getInverse(camera.matrixWorld);
cameraViewProjectionMatrix.multiplyMatrices(camera.projectionMatrix, camera.matrixWorldInverse);
frustum.setFromMatrix(cameraViewProjectionMatrix);
return frustum.intersectsObject(entityMesh);
}//checkIfVisible
// @source https://aframevr.slack.com/files/U2R8WNPL6/F80KA30LA/check_if_entity_is_in_the_viewport.js
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