Rotating and lerping to another material with custom shader.

HI, It all started when i wanted to make a moving skybox, And it turn out to be quite as simple as changing the _Rotation variable in the standard "6 sided skybox" shader with RenderSettings.skybox.SetFloat("_Rotation", rot += skyRotSpeed * Time.deltaTime);.
Then it got a little more complicated when i wanted after a 20s timer to change the skybox material to another one, and oh boy t$$anonymous$$s wasn't as easy as just: RenderSettings.skybox.Lerp(curSky, nextSky, skyLerpVal * Time.deltaTime); as you can see t$$anonymous$$s line should lerp to the "nextMaterial" material but surprise... it doesn't, I don't know if t$$anonymous$$s is actually the way to do it but what i do know is that i am not the only one around the internet who is facing t$$anonymous$$s issue and Have't found a solution.

Fast forward two hours of looking around i found a work around w$$anonymous$$ch is using a custom shader ( Script down There ) and it actually worked, well semi worked. It worked for actually lerping to another material but presented an issue with it:

1) Now i am not a shader expert by any means but that shader doesn't have the _Rotation variable w$$anonymous$$ch presented me the loss of the ability to rotate the skybox, I tried to copy the code from the standard "6 sided skybox" shader to t$$anonymous$$s custom one but no success ( NOTE: I have absolutely no experience with working with/writing shaders ).

2) I might need to swap between more than just two skyboxs, my initial thought was to just have a list of materials and iterate through it and lerp from the current one to the next using the index, but as i said, the RenderSettings.skybox.Lerp(curSky, nextSky, skyLerpVal * Time.deltaTime); method didn't really work so if there is a better solution to swap between more than two materials i would appreciate it.

Custom Shader:

 Shader "Skybox/Blended" {
 Properties {
     _Tint ("Tint Color", Color) = (.5, .5, .5, .5)
     _Blend ("Blend", Range(0.0,1.0)) = 0.5
     _FrontTex ("Front (+Z)", 2D) = "w$$anonymous$$te" {}
     _BackTex ("Back (-Z)", 2D) = "w$$anonymous$$te" {}
     _LeftTex ("Left (+X)", 2D) = "w$$anonymous$$te" {}
     _RightTex ("Right (-X)", 2D) = "w$$anonymous$$te" {}
     _UpTex ("Up (+Y)", 2D) = "w$$anonymous$$te" {}
     _DownTex ("Down (-Y)", 2D) = "w$$anonymous$$te" {}
     _FrontTex2("2 Front (+Z)", 2D) = "w$$anonymous$$te" {}
     _BackTex2("2 Back (-Z)", 2D) = "w$$anonymous$$te" {}
     _LeftTex2("2 Left (+X)", 2D) = "w$$anonymous$$te" {}
     _RightTex2("2 Right (-X)", 2D) = "w$$anonymous$$te" {}
     _UpTex2("2 Up (+Y)", 2D) = "w$$anonymous$$te" {}
     _DownTex2("2 Down (-Y)", 2D) = "w$$anonymous$$te" {}
 }
 
 SubShader {
     Tags { "Queue" = "Background" }
     Cull Off
     Fog { Mode Off }
     Lighting Off
     Color [_Tint]
     Pass {
     SetTexture [_FrontTex] { combine texture }
     SetTexture [_FrontTex2] { constantColor (0,0,0,[_Blend]) combine texture lerp(constant) previous }
     }
     Pass {
     SetTexture [_BackTex] { combine texture }
     SetTexture [_BackTex2] { constantColor (0,0,0,[_Blend]) combine texture lerp(constant) previous }
     }
     Pass {
     SetTexture [_LeftTex] { combine texture }
     SetTexture [_LeftTex2] { constantColor (0,0,0,[_Blend]) combine texture lerp(constant) previous }
     }
     Pass {
     SetTexture [_RightTex] { combine texture }
     SetTexture [_RightTex2] { constantColor (0,0,0,[_Blend]) combine texture lerp(constant) previous }
     }
     Pass {
     SetTexture [_UpTex] { combine texture }
     SetTexture [_UpTex2] { constantColor (0,0,0,[_Blend]) combine texture lerp(constant) previous }
     }
     Pass {
     SetTexture [_DownTex] { combine texture }
     SetTexture [_DownTex2] { constantColor (0,0,0,[_Blend]) combine texture lerp(constant) previous}
     }
 }
 
 Fallback "Skybox/6 Sided", 1
 }

Thank you in advance.

Oh and i will definitely use some exposure.