Volume rendring in opengl ?

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I new in OpenGl, I am trying to load ct scan into openGl and create 3d model form it. I foiund marching cube but nothing in opengl to implement or start with. any suggestion help will be more than welcome .

What I have tried:

Marching cube in openGl tutorial .(nothing found )
I found a project in source code and run it but seem hard coded I tried to understand the code but I can't .

Posted 19-Apr-16 1:02am

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Sergey Alexandrovich Kryukov 19-Apr-16 9:37am

Not clear. And I'm curious: what could "volume rendering" possibly mean?
—SA

enhzflep 19-Apr-16 10:01am

As for "volume rendering", any one of the 1,020,000 search results can explain it far better than I.
Once you understand the term, the question is perfectly clear. ;)

Sergey Alexandrovich Kryukov 19-Apr-16 14:01pm

Thank you very much. It's totally clear what is it, but at first I was pretty much sure it wasn't a really existing term, as the expression sounds way too ugly and illogical. I still think so, but we do use many ugly terms, just because they exist.
—SA

leon de boer 19-Apr-16 10:18am

https://en.wikipedia.org/wiki/Volume_rendering
Its a very very specific scientific and computer graphic term.
People sometimes use the term voxels or surface extraction for what it is.

Now to deal with the OP.

Sergey Alexandrovich Kryukov 19-Apr-16 14:03pm

Thank you very much. It's totally clear what is it, but at first I was pretty much sure it wasn't a really existing term, as the expression sounds way too ugly and illogical. Do you understand what I mean? I still think so, but we do use many ugly terms, just because they exist.

But, by the way, there is nothing "very specific" and nothing at all scientific. To me, it's more like professional jargon of practical developers.

—SA

enhzflep 19-Apr-16 20:43pm

My take on the reason it's associated with the tag scientific, is that much of the data that is visualized with the technique is in fact, scientific in nature.
It's a shame I broke my ankle when MO disks were all the rage and before cd/dvd were viable consumer storage formats. It would have been really neat to have had a copy of the CT scan data.

leon de boer 19-Apr-16 20:48pm

I will tell the department of scientific visualization in most universities that there is nothing scientific about one of their subsections. There is nothing specific about the terms Quantum Mechanics or Newtonian Physics either should we remove them as scientific terms as well?

Perhaps the alternative is you know nothing of the subject area and so it is meaningless to you. I accept you don't like the term but I am not sure that matters as enhzflep said its used so widely in the science community its a section.

I just ran a search on the term "volume rendering" (together as one term) in the physics.org and I get over 1000+ articles and asked to refine my search. It includes everything from reconstructing the anatomy of dinosaurs and ancient man, works on the expansion of space, research and visualization of the expansion and collapse of the death of a star to become a Nova or super Nova, the 3D occupancy of electron clouds around an atom and in solids, Superconductivity research and then normal medical and x-ray techniques. That is just the first couple of pages.

For comparison I used the term "CAPTCHA" which lists in the top 20 computer terms apparently (http://www.dailywritingtips.com/20-computer-terms-you-should-know/) and I get 28 entries most of them around google buying companies and a couple of hacker reports and one about Standford University have robot code that can defeat it.

For the record "Quantum Mechanics" only reports 894 results but the singular word Quantum returns 1000+ as well.

"Newtonian Mechanics" has zero entries which surprised me, I changed it to "Classical mechanics" which returned 8 and then "classical physics" which returned 9. Looks like classical physics as a science term goes ... hated that at high school so good riddance :-)

I think that is a reasonable comparison to show how wide the term is used in science research.

For my part it is a hell of lot more descriptive than most of the letter jargons (CAPTCHA a prime example) that gets use in computer programming, its is after all a render surface put around a volume of space ... so volume rendering is a good name.

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leon de boer · Answer 1 · 2016-04-19T04:29:00

Paul Bourke a lecturer from University of Western Australia has the best layman explaination and code I have seen for marching cubes.

Polygonising a scalar field (Marching Cubes)[^]

He shows you what is happening as well as the code.

Essentially you start with a box around what is usually a point cloud and then you start subdividing each face using the 45 degree face between them (his pictures make it clearer). So long as no point lies outside the face you continue the process over and over again marching the cubes down and subdividing more and more.

What you are left with when you can collapse the marching cubes no more is the shape that fits around the volume of the cloud points. That is where the process gets its name you have the surface render that fully encloses the random set of points (volume). Its used a lot it medical imaging where they construct the point cloud from CRT scans and then they want a surface mesh of the point cloud.

Volume rendring in opengl ?

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