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Jesús P. Mena-Chalco

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04 Mar 2010 Screenshot A fast voxel traversal algorithm for ray tracing A fast and simple voxel traversal algorithm through a 3D space partition (uniform grid) Author: Jesús P. Mena-Chalco 3dda, voxel, traversal, algorithm, uniform, grid 24 1
  • 4.0
4.0 | 1 rating
03 Mar 2010 Screenshot Ray/box Intersection Ray/box intersection using Smits' algorithm. The zip file includes one example of intersection. Author: Jesús P. Mena-Chalco ray, box, intersection, ray tracing, render, computer graphics 22 5
  • 4.33333
4.3 | 6 ratings
30 Aug 2009 Screenshot 3D curves Examples of 3D curves described in Chapter 7 of the book: "CRC Standard Curves and Surfaces" Author: Jesús P. Mena-Chalco 3d, curves, parametric, examples of curves, mathematics, computer graphics 11 0
18 Aug 2009 Screenshot Ray/Triangle Intersection Ray/triangle intersection using the algorithm proposed by Möller and Trumbore (1997) Author: Jesús P. Mena-Chalco ray, triangle, intersection, ray tracing, rendering, computer graphics 48 3
  • 4.28571
4.3 | 7 ratings
12 Aug 2009 Screenshot Genomic signature using FCGR Genomic signature using Chaos game representation of frequencies. Author: Jesús P. Mena-Chalco chaos game representa..., genomic signature, dna, visualization, bioinformatics 8 1
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04 Mar 2010 Theme from Super Mario Brothers Song plays the Super Mario Brothers theme song. Author: James Humes

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10 Dec 2014 A fast voxel traversal algorithm for ray tracing A fast and simple voxel traversal algorithm through a 3D space partition (uniform grid) Author: Jesús P. Mena-Chalco Vincent

Hi,

had to make a few adoptions to make it work for axes parallel rays:

1) In the rayBoxIntersection.m: Following the advice in the paper "An efficient and robust ray-box intersection algorithm" under the point improved code:

divx = 1/direction(1);
if (divx >= 0)
...

instead of

if (direction(1) >= 0)
...

for x,y and z each.

2) In amanatidesWooAlgorithm.m using

if direction(1) == 0
tMaxX = inf;
else
tMaxX = tmin + (voxelMaxX-start(1))/direction(1);
end

instead of

tMaxX = tmin + (voxelMaxX-start(1))/direction(1);

for x,y and z each. Before it calculated -Inf instead of Inf when dividing by zero.

10 Dec 2014 Ray/box Intersection Ray/box intersection using Smits' algorithm. The zip file includes one example of intersection. Author: Jesús P. Mena-Chalco Vincent

Hi,
I use this function within the "A fast voxel traversal algorithm for ray tracing" algorithm. And had an issue with axe parallel rays, which could be resolved following the advice in the paper "An efficient and robust ray-box intersection algorithm" under the point improved code:
divx = 1/direction(1);
if (divx >= 0)
...

instead of

if (direction(1) >= 0)
...

for x,y and z each.

22 Jun 2014 Ray/box Intersection Ray/box intersection using Smits' algorithm. The zip file includes one example of intersection. Author: Jesús P. Mena-Chalco denny

11 Feb 2014 Ray/box Intersection Ray/box intersection using Smits' algorithm. The zip file includes one example of intersection. Author: Jesús P. Mena-Chalco X Zhu

This code doesn't work at all!
For the following example test case:
[flag, tmin] = rayBoxIntersection([0 0 0], [-1 -1 -1], [2 2 2],[4 4 4]);
It returned with a flag "1"!
The author should withdraw the code.

29 Nov 2013 MGWT Identification of protein coding regions using the Modified Gabor-wavelet transform. Author: Jesús P. Mena-Chalco Ismail M. El-Badawy

Would you please explain why the threshold 'tv' is computed in this way?. I mean why its value depends on the length of the DNA sequence? what is the logic behind this and if this way of calculating the threshold appears in any reference.

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