# Thomas

### University of Manchester

I am a postgraduate research student based in Manchester in the United Kingdom.

Professional Interests: geology, geophysics, lidar, photogrammetry

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**Content Feed**

How can I merge two surfaces?

Assuming you have two sets of vertex lists, pointsA & pointsB, and two sets of face lists, facesA and facesB, you probably want ...

6 years ago | 2

Submitted

Fast mesh-mesh intersection using ray-tri intersection with octree spatial partitioning.

Fast mesh-mesh intersection based on ray-tri solution. Octree partitioning gives large speed-up.

6 years ago | 6 downloads |

Submitted

Hardware accelerated ray-box intersection

GPU portable implementation of the ray-box intersection method of Smits (1998)

6 years ago | 3 downloads |

Submitted

Hardware accelerated ray-triangle intersection

GPU portable implementation of the ray-triangle intersection method of Moller and Trumbore (1997)

6 years ago | 3 downloads |

Submitted

meshArea.m

Calculate the area of a triangular irregular network

7 years ago | 1 download |

Submitted

inertia.m

find best fitting plane through x,y,z points and calculate quality metrics (coplanarity/colinearity)

7 years ago | 1 download |

Error with importing data into Matlab

Looks like the error that is kicked out when the file isn't there. Check that it is in your work directory or include the full p...

7 years ago | 0

can any one tell me how to extract only the l component of the image ..if the image is rgb ..i want only the l component of the image ,how is it possible

Lets say you have a three channel RGB image, im. % extract the red channel red = im(:,:,1); % extract the green chann...

7 years ago | 0

How do I compute coordinate of an image in Matlab?

It really depends upon what you want. If you only want to track a single point, or a few points within your image series this ca...

7 years ago | 0

| accepted

conversion of image file into binary txt file

Hi megha You can do the following Urbinary = [0 1 0 0 1 0 1 0; % it says hi by the way! 0 1 0 0 1 0 1 0; ...

8 years ago | 0

Submitted

compose / decompose 3x3 rotation matrix (comp_decomp_matrix)

Compose 3x3 rotation matrix from euler angles or decompose 3x3 rotation matrix to euler angles

8 years ago | 1 download |

Submitted

euclidean

Computes the 3D distance between two xyz point sets represented by two matching nx3 arrays p and c.

8 years ago | 1 download |

How can be a 3D model is obtained using multiple 2d images using matlab ?

Hi Sam I believe you are trying to solve the structure from motion (SfM) problem. Below is a link to a matlab toolbox contain...

8 years ago | 1

| accepted

how to import csv file in matlab

I think the easiest way is to use CSVIMPORT from the File Exchange: http://www.mathworks.co.uk/matlabcentral/fileexchange/235...

8 years ago | 2

Strings from a text file to a matrix containing double precision floating numbers

I have worked out the answer for those with a similar problem: I use textscan and cellfun to split the strings, de-nest and r...

9 years ago | 0

| accepted

Question

Strings from a text file to a matrix containing double precision floating numbers

Hi I have a text file containing a text header, and rows containing numeric values, with varying numbers of values, character...

9 years ago | 3 answers | 0

### 3

answersQuestion

CELLFUN syntax when calling the ATAN2 function for 3 x 3 rotation matrix decomposition

Hi I'm trying to use cellfun to apply the following formulas to elements of 3 x 3 rotation matrices, R, stored within a 1 x ...

9 years ago | 2 answers | 0

### 2

answersWrite the content of individual cells in a cell array to discrete text files in a specified directory

Thanks Jan I have managed to get the code working using: for k=1:size(M,1) filename = ['C:\transform\cameras1\' '...

9 years ago | 0

| accepted

Question

Write the content of individual cells in a cell array to discrete text files in a specified directory

Hi I have an nx1 cell array, M, containing 4x4 matrices in individual cells. For example: M{1} = 0.9990 -0.0007 ...

9 years ago | 2 answers | 0

### 2

answersQuestion

Create a structure from discrete column vectors or a 3 x n matrix composed of column vectors

Hi I'm trying to build a structure consisting of elements which are column vectors representing x, y, z points. So far, I hav...

9 years ago | 1 answer | 0

### 1

answerQuestion

Iteratively concatenate 3x4 matrices held in a structure with single line arrays held in a structure

I have a structure, eulernew holding n 3x4 matrices (eulernew.RMn). eulernew = RM1: [3x4 double] RM2: [3x4 doub...

9 years ago | 1 answer | 0

### 1

answerQuestion

Iteratively concatenate matrices held in a structure with column vectors stored in an 3xn matrix

I have a series of 3x3 rotation matrices calculated from a 3xn matrix where columns are euler rotations. These are stored in a s...

9 years ago | 1 answer | 0

### 1

answerQuestion

Calculate 3 x 3 rotation matrices from 3 x n matrix

I am using the following code to open a .csv file, index columns of interest (euler rotations around x, y, z axes) as single col...

9 years ago | 2 answers | 0

### 2

answersQuestion

How to build multiple column vector output arguments by indexing from several single column arrays

I have written a simple piece of code that opens a csv file and orders the columns of interest into seperate single column array...

9 years ago | 1 answer | 0