Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Skycube RT: Real-time IBL HDR Cubemap Rendering Tool & Shader Library Free.
Skycube RT Real-time IBL HDR Cubemap Rendering Tool Shader Library
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SkyCube RT is a tool with shader library for in-game real-time HDR/LDR image base rendering solution. It renders cubemap with specular chain in real-time and cost less than standard cubemap rendering. It is a perfect solution for the case when you want use the same environment map for different glossiness objects/materials.
Please note, this tool has already been included in Skycube 3.5. If you had already purchased Skycube please check Skycube and update it.
It orients Unity4.5.x and compatible Unity5.x.
The tool will render cubemap with specular chain at the same time, it means you can access different roughness reflections in one cubemap and also can use them in one object just, for example, like multi-layer reflection material.
For more details of release info please visit SkyCube RT Homepage
Demo: HDR Real-time Reflection
• Unity5 Compatible
• RGBM High Dynamic Range (HDR) rendering
• Realtime Mipmap specular chain sample
• Realtime HDR/LDR Reflection Rendering
• Realtime Roughness HDR/LDR Reflection
• Smoothy cubemap update
• Linear and Gamma Space rendering support
• Easily use in any shaders
SHADER & SCRIPT FEATURES
• Mipmap specular chain sample
• DX and GLSL support
• HDR rendering (base RGBM decode)
• Diffuse & specular image-based lighting
• Per-pixel blurry reflection
• Library of HDR shaders function
• Camera Exposure Value control for HDR scene production and preview
• Full shader source and samples included
Feel free to provide requests and feedback in this >forum thread.
More information please check attached documents and sample files in package.