If you want to exchange the default renderer you can. Here's a small example.
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import { render, unmountComponentAtNode } from "react-three-fiber";const renderer = new THREE.SVGRenderer();renderer.setSize(window.innerWidth, window.innerHeight);document.body.appendChild(renderer.domElement);const camera = new THREE.PerspectiveCamera(75,window.innerWidth / window.innerHeight,0.1,1000);const scene = new THREE.Scene();render(<mesh><sphereGeometry name="geometry" args={[1, 16, 16]} /><meshBasicMaterial name="material" /></mesh>,scene);