Ray/box Intersection

Ray/box intersection using Smits' algorithm. The zip file includes one example of intersection.

Description

Ray/box intersection using Smits' algorithm

The zip file includes one example of intersection.

Author:
    Jesús Mena

References:
[1] "Efficiency issues for ray tracing".
    B. Smits.
    Journal of Graphics Tools, 3(2):1–14, 1998.

[2] "An efficient and robust ray-box intersection algorithm"
    A. Williams, S. Barrus, and R.K. Morley and P. Shirley.
    Journal of Graphics, GPU, & Game Tools, 10(1):45-60, 2005.

[3] Other algorithms:
    http://www.realtimerendering.com/intersections.html

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
Ray/Triangle Intersection
This submission has inspired the following:
A fast voxel traversal algorithm for ray tracing

• MATLAB release: MATLAB 7.6 (R2008a)

[Matt K]

There apears some errors exists. The scaling of the direction vector affects distances returned and even when I force a normalized vector, I have done test cases where the tmin distance from orgin is incorrect. I do appreciate the code, though, just want to pass along what I have found.

[HARI KRISHNAN]

 

[Chandrakumar]

 

[Deepak]

Hi,

I am using the ray box intersection m.file posted by Jesús P. Mena-Chalco.

In his test case, if i replace the point of origin from outside the cube to within it, the point of intersection of the ray with the box is exactly opposite from the direction of the quiver. Is there a reason why this is doing it ?

I reversed the direction of the quiver and it passes through the point of intersection. It not a perfect way to do without knowing what part of the code controls the direction of the quiver..

Any help ?

Thanks