- We begin by launching the application and creating
a Separator for the planet Earth.
- We add a Texture2
node and load the file earth.jpg.
We then add a Sphere node so we
can model the planet Earth.
- Now we're going to make our planet revolve. To do
this we add a Rotor node, placing
it above the Sphere node. We then
edit the rotation values as shown for rotation around the axis, adjusting rotation
speed to 0.5.
- We're now finished modeling the Earth. Now we'll
model the moon, adding a new Separator
node, with a Sphere, to the ROOT
node as shown. We edit the radius of the sphere so it will be less than
that of Earth, 0.2 for example.
- We can't see our new sphere? No problem. It's still
inside our planet Earth. To put it in its proper place, we add a Translation node, displacing it 10 units
along the X axis. Now click on the 'eye' icon (see step 6 for the location
of the icon, on the right of the display) so the camera will move far
enough away that the whole scene is visible.
- Now we're going to make the moon revolve around the
Earth. To do this, we insert a Rotor
node before the Translation node
and adjust rotation velocity, just as we did in step 3. (We don't need
to insert a Rotor node to make
the moon turn since it always presents the same face to the Earth.)
- Here's the result we should get, with the Earth and
the moon revolving automatically.