Shadow Maps

Starting point

This lesson continues from the lab, with your changes from the last two lessons.

Lesson 1.4 measured the Sun's shadow box: a 153.6 m square with 13.3 texels per metre. It slid the box along with the car, and showed that a box big enough for the whole road is a smudge. It never said why 64. Here you work out what the box has to cover, what each texel costs the edge of a shadow, and how small the box can go.