Figure 5

Geometrical Models in a brain surgery simulation. (a) A spatula model. 150 source nodes are located each collision plane. (b) 30 source nodes are located intensively on an anterior part of the spatula. (c) A brain model which is used in comparative simulation with-and-without the culling collision pairs. This model consists of 9,126 nodes, 34,401 tetrahedron elements and 12,608 surface triangles. (d) A brain model and a head model which are used in simulation of opening a brain fissure. This model consists of 12,331 nodes, 48,316 tetrahedron elements and 15,865 surface triangles. Collision detection between inside of the skull and the brain model are performed based on an approximation that a sphere represents a shape of the head. A blue sphere contains the brain model and red sphere excludes the brain model instead of a skull.