How to blend two independent Skyboxes

Hi, I'm trying to implement my own simple day night cycle. Light and ambience blending works fine. Blending two skyboxes via shader is also easy (thanks to the shader scripters), but I try to have the night sky rotate on x or z, while the day sky should be static, since there is a horizon in the image.

I have tried adding two cameras with skybox components attached for day and night respectively, but I can't seem to find a way to blend between those two, since you can't just fade out a skybox. If this would be possible I could just do:

Code (CSharp):

1. daySkybox.material.SetFloat("_Blend", 1-skyboxBlendCurve.Evaluate(currentTime));
2. nightSkybox.material.SetFloat("_Blend", skyboxBlendCurve.Evaluate(currentTime));

Is there a better way to blend two independent skyboxes, while allowing one of them to be rotated?

 

If you already have access to a shader that blends two skyboxes, I think it would be easiest to add rotation (properties & code) of the night sky texture to the shader itself. That being said, I found unity skybox shaders to be woefully underdocumented, so you are looking at some definite hair-loss

Note that while you can't fade a skybox itself, you could (although I find that to be a too-roundabout way) apply the second skybox to a dome in the scene, set it's index in the render queue directly after the skybox and blend it with the previous skybox.

 

@csofranz, thank you for the suggestions!

I actually searched for a rotatable skybox blend shader for hours and found this one, but I have to admit that this is beyond my skills, since there are 6 textures for each skybox and I have no clue what to change to make only one of them rotate.

So, I'm going to try out your second suggestion for now.

 

Hey, if you could post a link to the normal skybox shader, that would be really helpful. Thank you!