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How to change the background color without changing the data point color in THREE.js ?

Currently, I’ve got a series of data points show in the scene, the default backgroud color is black, I want to change to another color, but when I use the code like:

scene.background = new THREE.Color( 0xff0000 );

the data point color changed too. I was wondering is there any good method?

Thank you very much!