Unity3D中Quad渲染8x8图集纹理模糊问题求助

Hey there, let's break down why your 8x8 texture slices are looking blurry and fix this step by step—this is a super common pitfall for Unity beginners working with pixel art/texture atlases!

Core Issue: Incorrect Texture Import Settings #

The biggest culprit here is almost certainly how Unity is processing your 32x32 texture atlas by default. It applies smoothing (filtering) and compression that works great for high-res textures, but destroys sharpness for tiny 8x8 pixel slices.

Step 1: Fix Texture Import Settings #

Find your atlas texture in the Project window, then adjust these settings in the Inspector:

• Filter Mode: Set to Point (no filter) — this disables blurry pixel interpolation, keeping your texture edges sharp.
• Wrap Mode: Set to Clamp — this prevents the texture from repeating, eliminating "bleeding" where adjacent atlas textures peek through.
• Compression: Set to None (or Low Quality if you need to save space) — compression artifacts will blur your tiny pixels.
• Max Size: Ensure this is set to 32 (matches your atlas resolution) — Unity won't upscale the texture unnecessarily.

Step 2: Clean Up Your UV Coordinates #

You're using tiny offsets like 0.251f to avoid bleeding, but with the correct texture settings above, these are actually causing misalignment with the pixel grid. Since 8/32 = 0.25, use exact values instead:
For example, your FRONT quad UVs should be:

uvs = new Vector2[] { 
    new Vector2(0.25f, 0.25f), 
    new Vector2(0.0f, 0.25f), 
    new Vector2(0.0f, 0.0f), 
    new Vector2(0.25f, 0.0f) 
};

Do this for all cube sides—remove the 0.001 offsets entirely. This ensures your UVs perfectly align with the edges of your 8x8 atlas slices.

Step 3: Use a Shader Optimized for Pixel Sharpness #

The Standard Shader adds lighting and smoothing that can soften your pixel art. For crisp results, switch to a simpler shader:
Update your LoadData method to use the Unlit Texture shader instead:

private void LoadData() {
    if (blockType == BlockType.AIR) {
        this.isSolid = false;
        return;
    }
    // Use Unlit/Texture for pixel-perfect results
    this.material = new Material(Shader.Find("Unlit/Texture"));
    Texture2D texture2D = Resources.Load("Textures/" + blockType) as Texture2D;
    this.material.mainTexture = texture2D;
}

If you need basic lighting, you can stick with the Standard Shader but set Metallic and Smoothness to 0, and ensure Rendering Mode is set to Opaque.

Step 4: Verify Mesh Merging #

When combining quads in CombineQuads, make sure you're not accidentally introducing scaling or alignment issues:

• Check that the parent chunkGameObject has no unintended scale (set to (1,1,1)).
• The CombineMeshes call uses false for the second parameter (this prevents merging submeshes unnecessarily, though it's not critical for a single material setup).

Bonus: Prevent Texture Bleeding (If Needed) #

If you still see tiny bits of adjacent atlas textures peeking through, add a 1-pixel "buffer" around each 8x8 slice in your atlas. Fill this buffer with the same color as the slice's edge—this way, any minor UV misalignment won't show neighboring textures.

That should get your 8x8 slices rendering crisply! Let me know if you run into any other snags.

内容的提问来源于stack exchange，提问作者Albert451