getting the image from the given (x , y, z) coordinates and the RGB values...

I have an excel sheet containing the (x,y,z) coordinates and RGB values of a cylindrical object. I have to find a method to visualize the complete scan of the cylindrical object using the (x,y,z) coordinates and the RGB values..any suggestions???

Answer 1

[ramakrishna bathini]

ply

format ascii 1.0

comment Created By NextEngine ScanStudio

element vertex 59115

property float x

property float y

property float z

property uchar red

property uchar green

property uchar blue

element face 95216

property list uchar int vertex_indices

end_header

0.000000 0.000000 0.000000 3 1 2

-18.863741 -92.029701 13.614387 129 126 117

-18.998341 -92.818878 13.444517 135 128 118

-18.590004 -92.631859 13.973493 134 127 117

-18.744694 -93.426620 13.768112 113 108 102

-18.334249 -93.253525 14.307983 122 117 111

-18.423294 -91.885246 14.125358 129 126 117

-18.296009 -91.132355 14.340027 125 125 117

-18.227312 -90.328476 14.459743 143 139 127

-18.169962 -92.522598 14.508581 128 127 109

-17.996819 -91.854973 14.680487 123 119 108

-17.865927 -91.340729 14.919821 130 126 114

-17.930870 -90.837242 14.866018 120 119 114

-17.936970 -89.988739 14.838840 127 125 112

-17.870956 -93.138756 14.821781 120 115 109

-17.695745 -92.464470 15.036329 114 111 106

-17.560673 -91.829483 15.278341 116 110 98

-17.460785 -91.129379 15.439266 114 112 100

-17.635191 -90.383430 15.183870 118 116 104

this is the sample data in the excel sheet..

Answer 2

[Walter Roberson]

First, textscan() or dlmread() the data skipping all of the header information. textscan would make it easier.

Then as an approximation to the surface, scatter3() the x y z coordinates with some fixed marker size and with the color matrix set to be the array of RGB values rescaled to [0 1] (i.e., divided by 256)

scatter3() will get you a cloud rather than a surface. There are a number of methods to get to a surface, such as delauny() and trisurf() or some newer functions that aren't in the version I'm using (2008b)

[ramakrishna bathini]

Thanks for your reply..textscan() got the all data into a variable...i have gone through scatter3(), delaunay(),trisurf() docs..but couldn't comeup with a solution on how to use those functions..can u please explain a bit more abt displaying part...

[Walter Roberson]

For example, if you had vectors x, y, z, r, g, b, each representing one column of the input, then:

ballsize = 10;

scatter3(x, y, z, ballsize, [r, g, b]./255 )