AE表达式｜27、入点淡入&出点淡出？@ inPoint @ outPoint

让图层在入点淡入，出点淡出，给Opacity添加表达式：

fade = 1;
fadeIn = (time - inPoint) / fade;
fadeOut = (outPoint - time) / fade;
if(time < inPoint + fade){
	ease(fadeIn, 0 ,1)*value
}else if(time > outPoint -fade){
	ease(fadeOut, 0, 1)*value
}else{
value
} 

如果需要精确到帧的控制，则添加表达式framesToTime(),将原表达式改为：

fadeFrames = 6;
fade = framesToTime(fadeFrames);
fadeIn = (time - inPoint) / fade;
fadeOut = (outPoint - time) / fade;
if(time < inPoint + fade){
	ease(fadeIn, 0 ,1)*value
}else if(time > outPoint -fade){
	ease(fadeOut, 0, 1)*value
}else{
value
} 

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