Hey, let's break down this tricky Three.js issue you're facing with camera movement causing black screens. Here are targeted troubleshooting steps based on common pitfalls in this scenario:

• Check Model Matrix Updates & Frustum Culling
  After loading your in-game model, it's possible the model's matrixWorld isn't updating correctly, or its bounding box/sphere calculations are off. This can make Three.js's frustum culling logic mistakenly think all objects are outside the camera's view when you move it, resulting in a black screen. Try manually forcing matrix updates:

  model.updateMatrixWorld(true);
  

  Also, use Three.js debug tools (like the official debug panel or Stats) to check if the number of rendered objects drops to 0 when you move the camera—this confirms if culling is the culprit.

• Resolve Residual Resource Conflicts
  Since the issue persists even after removing the model loading logic but keeping its memory spot, leftover resources (like BufferGeometry, Material, or Object3D instances) are likely causing conflicts in the render pipeline. Try these cleanup steps:

  • Manually dispose of all model-related resources:

    if (model) {
      model.traverse(obj => {
        if (obj.geometry) obj.geometry.dispose();
        if (obj.material) {
          Array.isArray(obj.material) ? obj.material.forEach(m => m.dispose()) : obj.material.dispose();
        }
      });
      scene.remove(model);
      model = null;
    }
    

  • Check for global variables or closures holding references to model resources, which would prevent garbage collection from cleaning them up.

• Fix Camera Projection Matrix & Model Coordinate Conflicts
  Some models might use extreme coordinate values (like oversized scaling or huge offsets). When moving the camera, this can cause floating-point precision loss in the projection matrix, breaking scene rendering. Test these fixes:

  • Reset the model's transform to a reasonable range:

    model.position.set(0, 0, 0);
    model.scale.set(1, 1, 1);
    model.rotation.set(0, 0, 0);
    

  • Temporarily switch from PerspectiveCamera to OrthographicCamera—if the black screen goes away, it confirms projection precision issues are to blame.

• Reset Render Loop State Pollution
  Model loading code might accidentally modify global WebGL states (like depth testing, blending modes, or shader uniforms) without resetting them. Even after removing the model, these stuck states can break rendering during camera movement. Add these resets at the start of your render loop:

  renderer.setClearColor(0x1a1a1a); // Replace with your actual background color
  renderer.clear();
  renderer.autoClear = true;
  

  Also, check if your model loading code has manual gl context changes (like gl.disable(gl.DEPTH_TEST)) that weren't reverted.

内容的提问来源于stack exchange，提问作者Edward