Adaptive Ray-bundle Tracing with Memory Usage Prediction: Efficient Global Illumination in Large Scenes (Implementation Details)

where Ao(t) is the area of the triangle in object space and Al(t) is the area of the triangle in light map space. However, it can lead to large errors for small triangles in practice, as shown in Figure 2 (a). UV unwrapping tools can produce noise caused by lack of computation precision which is generally undetectable to artists. Even if the area of a triangle in light map space is imperceptible, it can be much larger than the area in object space for practical scenes.