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Using the Halfway Angle<br />
•Replace (v · r ) α by (n · h ) b<br />
•b is chosen to match shininess<br />
•Note that halfway angle is half of angle<br />
between r and v if vectors are coplanar<br />
l<br />
n h<br />
φ Θ-φ<br />
θ θ Φ<br />
r<br />
v<br />
<br />
<br />
<br />
2<br />
DCP4516 Introduction to Computer Graphics 25
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