Fig. 2
From: Efficient motion blurred shadows using a temporal shadow map
A triangle moves from the beginning (t = 0) to the end (t = 1) of a frame. At t = 0 and t = 1, this triangle is ABC and A′B′C′, respectively. a A brute force method renders this triangle many times. At the pixel P, this triangle is visible at times t 1 , t 2 , t 3 , t 4 , and t 5 . b Our algorithm renders this triangle only once and then finds the first (t 1 ) and the last times (t 5 ) when this triangle is visible at the pixel P