Unity 2017.3+Vuforia7 AR涂色书3D模型纹理显示异常求助

Hey there! Let's work through this AR coloring book issue you're hitting with Unity 2017.3, Vuforia 7, and Texture Region Capture 2.0.6. I’ve dealt with similar setup changes between tool versions before, so let’s break down the fixes step by step:

Key Issue Breakdown #

The problem where your 3D model shows the full camera feed instead of just the targeted texture happens because the newer Texture Region Capture script has a different logic flow than the old version you used. Either the capture region isn’t properly restricted, the texture isn’t being assigned correctly to your model, or the capture isn’t synced with Vuforia’s tracking state.

Step-by-Step Fixes #

1. Double-Check TextureRegionCapture Setup on AR Camera #

• Make sure the TextureRegionCapture script is mounted only on Vuforia’s AR Camera (not a regular Unity Camera).
• Configure the Region Rect parameter properly: This defines the exact area the tool captures. For a coloring book, set this rectangle to match the bounds of your Image Target’s texture (you can tweak the X/Y position and width/height values to narrow it down—start with a small test rectangle to verify it’s capturing only that area).
• Enable the Capture Only When Tracking checkbox: This ensures the region capture only activates when an Image Target is detected, preventing it from showing the full camera feed when nothing is tracked.

2. Verify Model Material & Texture Assignment #

• Your 3D coloring model needs a simple material (like Unlit/Texture) that uses the captured region texture as its main texture.
• Update the TextureRegionCapture script’s OnTextureReady callback to explicitly assign the cropped texture to your model’s material. Replace the placeholder code with something like this:

  // Add a public reference to your coloring model in the inspector
  public GameObject coloringModel;
  
  public void OnTextureReady(Texture2D texture)
  {
      // Assign the cropped capture texture to the model's material
      coloringModel.GetComponent<Renderer>().material.mainTexture = texture;
  }
  

• Important: Never use the AR Camera’s full render texture directly—always rely on the cropped output from TextureRegionCapture.

3. Sync Capture with Vuforia Tracking Events #

Vuforia 7 uses DefaultTrackableEventHandler to handle target tracking states. Modify this script to start/stop capture when the target is found/lost:

// Add a public reference to your TextureRegionCapture component in the inspector
public TextureRegionCapture regionCapture;
// Optional: Add a reference to your model's default texture to revert when tracking is lost
public Texture2D defaultModelTexture;
public GameObject coloringModel;

protected override void OnTrackingFound()
{
    base.OnTrackingFound();
    // Start region capture when the target is detected
    regionCapture.StartCapture();
}

protected override void OnTrackingLost()
{
    base.OnTrackingLost();
    // Stop capture and revert to default texture
    regionCapture.StopCapture();
    coloringModel.GetComponent<Renderer>().material.mainTexture = defaultModelTexture;
}

• Mount this modified script on your Image Target object, then drag the AR Camera’s TextureRegionCapture component into the regionCapture field in the inspector.

4. Debug with UI Preview #

• To isolate the issue, add a RawImage to your UI and assign the TextureRegionCapture’s output texture to it. If the UI shows the correct cropped region, the problem is in your model’s material/rendering setup. If the UI still shows the full camera feed, go back to adjusting the Region Rect and capture settings.

Final Checks #

• Ensure your AR Camera’s Culling Mask only includes layers for AR content and UI (no extra layers that might add unwanted elements to the capture).
• Confirm your 3D model’s layer is included in the AR Camera’s Culling Mask so it renders correctly.

内容的提问来源于stack exchange，提问作者patri