I tried using scene.overrideMaterial to replace the material in the scene with MeshNormalMaterial and render it to the rendertarget so that my custom post-processing can pick it up, but I found that when I sampled in the shader, the colors were different, even though I had set the renderer's outputColorSpace and the texture's colorSpace

Rendering directly to the screen：

Sampled in custom effect：

Am I overlooking something? Do i need gamma correction?