GPU Pro 7

3. A 3D Visualization Tool Used for Test Automation in the Forza Series 241

Figure 3.7. By-design skewed normals to simulate the effect of bumpy surfaces on the

tires.

Later we arrived on a heuristic that works quite well for our meshes to detect

those bad skewed normal. Our normals are exported with a 64-bit precision, and

in the tool we recalculate the normal with the following non-weighted formula:

normalize



k



i=0

n

i



,

where k is the number of faces in the one-ring neighborhood of a vertex and n

i

is

the face normal of each triangle. We calculate this formula with 32-bit precision.

After this, we have two set of normals: the original one with 64-bit