解答:
要讓表面變成受光影響的漫射材質,修改 createBall()

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var material = new THREE.MeshLambertMaterial( { color: 0x80FC66, shading: THREE.FlatShading } );
var ka = 0.4;
material.ambient.setRGB( material.color.r *ka, material.color.g* ka, material.color.b * ka );