how to make resolution better? bufferGeometry?
if use textGeometry, i can use curveSegments, but how i can directly export text from blender to three.js?
Model your text in Blender and then export it to glTF. You can then use GLTFLoader to import the asset into your three.js scene.
More information about glTF workflows in this guide.
You can debug your exported asset in various glTF viewers (e.g https://gltf-viewer.donmccurdy.com/). If have questions about text modeling in Blender, please visit the Blender community.