[/geometry] Convert Skybox to Cylinder map

[Whirligig Girl]

Is it possible to convert a Cubical Map (Like a Skybox) into a Spherical Map (Like a planet texture) using simple tools or some kind of converter tool?

Yes, I have a reason. No, I'm not ready to tell you. Yes it deals with planets in KSP.

[Dodgey]

Does it have to do with hollow Earth theory (can we get a better name for things that aren't theories?).

I just pulling this out from in between my gluteus maximus but isn't a skybox just a texture like anything else? So wouldn't you be able to lay it onto a sphere like anything else? Again that is worse than a stab in the dark.

[Starwhip]

Does it have to do with hollow Earth theory (can we get a better name for things that aren't theories?).

I just pulling this out from in between my gluteus maximus but isn't a skybox just a texture like anything else? So wouldn't you be able to lay it onto a sphere like anything else? Again that is worse than a stab in the dark.

I think he means the actual skybox being applied to the planet/sphere, not the "theory".

Um... with editing, maybe. Do you have a skybox?

[Robotengineer]

For a blackhole effect? Idk, try putting the skybox on the planet?

[Whirligig Girl]

What I'm trying to do is make a planet use the skybox as it's texture, but a Skybox and a Cylinder map are totally different topologies. I need a converter to change from a cube-map to a cylinder map. A Skybox is comprised of 6 textures. Up, Down, Left, Right, Forward, Backwards. A Cylinder map is one texture.

[Starwhip]

What I'm trying to do is make a planet use the skybox as it's texture, but a Skybox and a Cylinder map are totally different topologies. I need a converter to change from a cube-map to a cylinder map. A Skybox is comprised of 6 textures. Up, Down, Left, Right, Forward, Backwards. A Cylinder map is one texture.

http://paulbourke.net/geometry/transformationprojection/plain_00000.jpg

I could do it, I think, but the distortion would be quite... interesting.

I'd suggest just using the Skybox texture as the entire texture. You want a cylinder, right? (No end caps? ) Use the rectangle made of the "Left, Right, Forwards and Backwards" sections.

EDIT:

That's for a cheap placeholder, anyway. You could bake a texture from the box to the sphere/cylinder, which would be more proper.

[Whirligig Girl]

I still need the end caps. That's what the green and red textures on the projection are for!

[Starwhip]

Like this. You'd need to texture the cube, and then I *think* you could bake to the sphere (Make a distorted texture)

EDIT:

Why a cylinder, might I ask?

[CaptainKipard]

You can do it using Blender's projection painting tools. You paint onto a UV unwrapped cylinder with the individual images as your projection. You just have to be careful around the cylinder edges, because you'll get a stretched-looking texture if you go over with your brush.

Edited November 11, 2014 by Cpt. Kipard

[Starwhip]

You can do it using Blender's projection painting tools. You paint onto a UV unwrapped cylinder with the individual images as your projection.

Bingo! (It sounds right, anyway )

How, exactly? (I suck at texturing in general )

So an unwrapped Cylinder... now a Cube? Hmm.

Edited November 11, 2014 by Starwhip
Added image

[Whirligig Girl]

The cyliner map is needed because that's how planets are textured.

This is the kind of texture I want.

It's not mapped onto a cylinder, but it is a cylindrical projection.

Starting with this:

We change it to this: (Ignore the color differences. There's not supposed to actually have been any color change in each side, but I couldn't find the cylinder map for this exact one, nor the cube map for the following map.

As you can see, when the cube-reprojection is mapped to Kerbin, you get this.

I want to map a skybox texture to the cylinder projection. (Not actually this skybox, this is just an example from SpaceEngine.)

Edited November 11, 2014 by GregroxMun

[Whirligig Girl]

I found a program which will export a cubemap to a cylinder map. Problem is, it consts money. Here's what I managed with the demo.

The program is called Bixorama. I'm debating whether or not to buy it.

[K^2]

GregroxMun, PM me your e-mail. I'll write a conversion tool for you.

[CaptainKipard]

It's not mapped onto a cylinder, but it is a cylindrical projection.

I misunderstood your post, but that's not relevant. Whether it's a cylinder or a sphere you can still use projection painting to do it.

It's not automatic though.

[lajoswinkler]

Does it have to do with hollow Earth theory (can we get a better name for things that aren't theories?).

Ideas... Maybe "a notion", though notions have more strength to them. It's not a theory, at all, not even a hypothesis.

[mivanit]

really really sorry to necropost, but did anyone ever find a good tool for doing this? I have the exact same problem