Create a sphere (scale 1.6 xyz) → Deform → Lattice box → Division: 6,6,6 → Create
Go to front view → select lattice layer → R click → lattice point
Deform the shape like a brain (1:03- 2:50)
Go to top view → select Sphere layer → Edit → Delete by Type → History
→ select Face mode → delete upper half of the brain → (shift + R click) → Smooth
→ select the sphere,
Generate (top bar in Modelling tab) → Make Paintable → click the sphere again, Generate → Get Brush →
Flesh → Smoothskin.mel →
Hold B + drag L mouse to adjust brush size → draw couples of splines surrounding the hemisphere →
Select all splines → Modify → Convert → Paint effect to polygon
Select all objects in the scene → Mesh (top bar) → Combine
→
Delete by type → history
Lighting → 2 sides lighting
Assign new material → Phong
Method 2:
After creating the half hemisphere brain shell, choose Make Live button (an magnet icon), so now the brain can’t be selected, and can be drawn anything on top
Hold shift+ R click → Quadra Draw Tool → click 4 spots as a square→ if hold shift, square turns green, if keep adding points, it extends the squares; if mouse point on and square edge, can relax it.
Hold Tab → can draw polygons around; if hold middle mouse + tab, can scale the square, if need to delete, hold Shift + Ctrl; if hold Ctrl, green line appears which try to align on surface