Time for action - creating the sky sphere in Panda3D

Next, we'll create a sky sphere writing tool that we can use to create sky sphere bam files.

Open a new file in Notepad++. Type the following two lines at the top:

import direct.directbase.DirectStart
from pandac.PandaModules import *

Next, we'll define a new class and its __init__ method:
```
class SkySphereWriter:
def __init__(self):
```
After that, we'll load the skybox as a cubemap and also load the inverted sphere, which is a normal 1 unit sphere, except that the faces point inward instead of outward. The # sign in the first line is replaced with the numbers 0 through 5 when Panda3D loads the cubemap.
```
self.texture = loader.loadCubeMap("../Images/Purple_#.png")
self.sphere = loader.loadModel("InvertedSphere.egg")
```

Now, we need to create 3D texture coordinates for the sphere. To do that, we need to make two calls on the sphere: setTexGen() and setTexProjector().

self.sphere.setTexGen(TextureStage.getDefault(),
TexGenAttrib.MWorldPosition)
self.sphere.setTexProjector(TextureStage.getDefault(),
render, self.sphere)

The sphere is ready to have the texture applied, so we'll do that next:
```
self.sphere.setTexture(self.texture)
```
We can also put in some NodePath settings here so that they'll be saved in the bam file:
```
self.sphere.setLightOff()
self.sphere.setScale(1500)
```
Now, we just need to write out the file, and reparent the sphere to render so that we can preview it:
```
self.sphere.writeBamFile("PurpleSkySphere.bam")
self.sphere.reparentTo(render)
```
To finish up the file, we need to instantiate our class and call the run() method:
```
SSW = SkySphereWriter()
run()
```
Save the file in BGP3D/Models as SkySphereWriter.py and run it.

Time for action - creating the sky sphere in Panda3D

What just happened?

That does it, we now have a sky sphere ready for use. We can even reuse our sky sphere writer just by changing the filenames.