Function getProjectionMatrix

docs/app/js/sanddance-app.js:80419–80423

(options)

    };
}
function getProjectionMatrix(options) {
    const { fov , aspect , near , far  } = getProjectionParameters(options);
    const projectionMatrix = _mat4.perspective([], fov, aspect, near, far);
    return projectionMatrix;
}
function altitudeToFovy(altitude) {
    return 2 * Math.atan(0.5 / altitude) * RADIANS_TO_DEGREES;
}