Interactive Ray Tracing of Pointbased Models. Ingo Wald SCI Institute, University of Utah wald@sci.utah.edu. Motivation. Why pointbased rendering ? Many advantages, but no details here … But: Why pointbased ray tracing ? Actually, two different questions:
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Ingo Wald
SCI Institute, University of Utah
wald@sci.utah.edu
Interactive ray tracing: Three recent examples
Interactive ray tracing: Three recent examples
Interactive ray tracing: Three recent examples
Interactive ray tracing: Three recent examples
Interactive ray tracing: Three recent examples
points gathered by beam
Position A
Hitpoint position ?
points gathered by beam
Position A
Hitpoint position ?
Position B (Light ?)
Position A
surface seen from A
Same surface, different viewpoint:
Same hitpoint ?
Is it in shadow ?
Hitpoint position ?
Optimal solution: Use exactly that technique
C
B
D
A
C
B
D
A
C
B
D
A
C
B
D
A
C
B
D
A
C
B
D
A
C


C
B
B
B,C

A
A,B
A,B,C
(right side incomplete)
D
A
A

C


C
B
B
B,C

A
A,B
A,B,C
D
A
A

C


C
B
B
B,C

A
A,B
A,B,C
A,B,C
A
A
A,B,C
C


C
B
B
B,C

A
A,B
A,B,C
A,B,C
A,B,C
A
A
A,B,C
C


C
B
B
B,C

A
A,B
A,B,C
A,B,C
A,B,C
A
A
A,B,C
C


C
B
B
B,C

A
A,B
A,B,C
A,B,C
A,B,C
A
A
A,B,C
C


C
B
B
B,C

A
A,B
A,B,C
A
A
C


C
B
B
B,C

A
A,B
A,B,C
A
A
A


C
B
B,C

A
A,B
A,B,C
A
C
B,C
A,B
A
C
B,C
A,B
A
Need to minimize regions of influence (minimize ri !)
Advantages of PBG in particular for ray tracers:
Advantages of PBG in particular for ray tracers:
Highly controversial issue amongst ray tracers
points gathered by beam
Position A
Hitpoint position ?
Same surface ?