### Overview

Blender Lighting Mode Only provides a non-destructive viewport overlay that isolates scene illumination, allowing you to calibrate contrast, shadows, and light bounces cleanly without the distraction of surface textures. It functions universally across Cycles and EEVEE-Next in Blender 5.x.

### Installation

1. Download the provided 'blender_lighting_mode_only.zip' file (do not unzip it).

2. In Blender, navigate to Edit > Preferences > Add-ons (or Extensions).

3. Click the dropdown menu/arrow in the top-right corner and choose "Install from Disk...".

4. Select the zip file and click "Install Add-on".

5. Enable the checkbox next to "Blender Lighting Mode Only" to activate it.

### How to Use

1. Open the 3D Viewport sidebar by pressing 'N' on your keyboard.

2. Locate and open the "Blender Lighting Mode Only" tab.

3. Click "Enable Diagnostic View" to activate the clay override layout.

4. Adjust parameters in real time using the interface panel:

   * Clay Color: Adjust the baseline tint of your geometry (strictly clamped between 0.0 and 1.0 to preserve accurate exposure data).

   * Keep Normal/Bump Maps: Toggle this on to preserve micro-surface depth and tactile details under the clay pass.

   * Keep Emissive Meshes: Toggle this on to keep glowing procedural fields, neon signs, and light cards shining natively.

5. Click "Disable Diagnostic View" to return safely to your original beauty materials.

### Important Production Notes

* Transparency Handling: The addon automatically scans shader root nodes for alpha texture chains and transparent/glass flags. It natively overrides EEVEE-Next viewport properties to 'BLENDED' and updates Cycles paths so foliage transparency cards and car headlight glass modules remain correctly transparent.

* Non-Destructive Cache: Original material data strings are cleanly cached in object memory attributes. Turning the view off cleanly deletes the generated diagnostic temporary materials from your blend file cache.