How to fade one texture into the other

Scripting Issues
1

So basically I have a sky model and I want it’s texture to fade from this texture (default one):

8421ccb9ec5c4f10823798025d75d45d.png819×818

To this texture:
a0f5fefe5a1e40cf95c762f52f2e9cd9.png820×817

Let’s say that fading isn’t really the problem here (I will probably use a function lerp) but the main question is how to add the secondary texture to the model setting it’s transparency to 0 then using my function lerp I will decrease the primary texture’s transparency and increase the secondary texture’s transparency, so what function method should I use to accomplish the transparency goal?

2

You could apply both textures to the same model, and use combine mode CMInterpolate to interpolate between the two.

This is explained on this page:

https://www.panda3d.org/manual/index.php/Texture_Combine_Modes

On the second texture stage, you would set a CMInterpolate mode to interpolate between the previous and current texture stages based on some constant factor (such as the alpha scale).