threejs的坐标体系
// 平面不旋转的效果
plane.rotation.x = 0;
plane.position.x = 0;
plane.position.y = 0;
plane.position.z = 0;
// 逆时针旋转90°
plane.rotation.x = -0.5*Math.PI;
plane.position.x = 0;
plane.position.y = 0;
plane.position.z = 0;
plane.rotation.x = -Math.PI/4;
plane.position.x = 0;
plane.position.y = 0;
plane.position.z = 0;
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y轴和z轴的位置要互换(上图)
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上图中红绿蓝所在的方向是坐标轴的正方向