An Overview on Base Real-Time Shadow Techniques in Virtual Environments
Abstract: Shadows are elegant
to create a realistic scene in virtual environments. Variety types of shadow
techniques encourage us to prepare an overview on all base shadow techniques.
Non real-time and real-time techniques are big subdivision of shadow generation.
In non real-time techniques ray tracing, ray casting and radiosity are well
known and deeply described. Radiosity implemented to create very realistic
shadow on non real-time scene. Although traditional radiosity algorithm is
difficult to implement, we have proposed a simple one. The proposed pseudo code
is easier to understand and implement. Ray tracing used to prevent of collision
of movement objects. Projection shadow, shadow volume and shadow mapping are
used to create real-time shadow in virtual environments. We have used
projection shadow for some objects are static and have shadow on flat surface.
Shadow volume used to create accurate shadow with sharp outline. Shadow mapping
that is the base of most recently techniques is reconstructed. The reconstruct
algorithm gives some new idea to propose another algorithm based on shadow
mapping.
Author: Hoshang Kolivand, Mohd
Shahrizal Sunar
Journal Code: jptkomputergg120038
