1. Assistant Professor, Dept. of Construction Science, Texas A&M Univ., College Station, TX 77843.
2. Ph.D. Student, Dept. of Architecture, Texas A&M Univ., College Station, TX 77843.
3. Ph.D. Candidate, Dept. of Computer Science, Univ. of Texas at San Antonio, San Antonio, TX 78249.
4. Associate Professor, Dept. of Computer Science, Director of SAVE laboratory (San Antonio Virtual Environment), Univ. of Texas at San Antonio, San Antonio, TX 78249.
5. Associate Professor, Dept. of Architecture, Texas A&M Univ., College Station, TX 77843.