GPU Pro 5

226 III Image Space

Figure 1.7. Left: fins bleed from undetected obstructed object. Right: obstructed

object detection.

to mark their grass using a spare alpha channel instead of relying on pixel color

to detect grass.

It is worth mentioning that a similar noise effect would also be great for

simulating micro leaf movement on distant trees.

Visual artifacts can result from smudging source pixels that are not part of

the terrain. This can happen when an object is rendered on top of the terrain

(e.g., trees and other props). To detect these pixels, we must take an additional

sample from the position texture of the source pixel.Ifthesource pixel is closer ...