1: MODELING THE OVERALL SHAPE OF THE CORTEX
To get an
object that was as low-res as possible I decided to use a two step process.
First I modeled the basic shape of the brain. Then I used the solid drill
command to drill the wrinkle lines onto the brain shape. I then used the
points from the drill operation to recreate the brain as a subpatch cage.
The first step was to figure out how to make the wrinkles on the brain
surface. I drew a rough cross section of a brain, using the pen tool.
I made various kinds of kinks to form the folds of the brain. Extruding
the shape and deleting the front and back faces gave me a simple cage
that I could use to work out the best placement for points.
type marked with the arrow is the one I chose to use. It has two control
points at the bottom of the wrinkle and two at the top that cross each
other. This gave a nice tight wrinkle.
Move the cursor over the image to see the Sub Patch version.
Using a digital camera, I photographed a model brain. I cropped these
pictures in Photoshop and imported them into Modeler as background images. It helps to create a box that
is the correct size and proportion as the template images. You can then use the Automatic Size adjustment button
to fit the template images to
Modeling the gross shape.
Starting the lobe. The upper left panel shows a failed attempt
to create a UV map as I went along. The end of this tutorial discusses creating a spherical UV map for this
Shaping the lobe.
The basic shape of the brain cortex done.