The reflection education of the environment mapping technique is geometrically biased and cannot obtain parallax effects because the object’s surface position is unknown. We improved the technique by introducing position rectification. First

the environment’s position information is stored in a distance map; then the query vector of the environment map is rectified in two conditions using the distance map to reduce the geometrical bias in the calculation of the reflection.A layered rendering method is given to manipulate scenes that contain multiple objects.Our results show the introduction of the position rectification boosts the accuracy of environment mapping in reflection calculation and can obtain the parallax effect caused by the occlusions of objects.