Manual Geometrik Mesh Generator

sphinkie · Post by **sphinkie** » Mon Apr 24, 2006 9:12 am

Hello guys

I was looking for a piece of code to create planets during runtime.
I have used the MeshSphere written by snowblind in the wiki.
And modified it to create geospheres (better for planets, because of the pole texturing management).

I have created a generic class named GeometricMesh that can be derived into Mesh_Cube, Mesh_icosa, Mesh_sphere, and other simple shapes.

Then I have created a generic class named Geodesic that can be derived into Mesh_GeoSphere, Mesh_Geoellipse and other complex geodesic shapes (class 1 and class 2 shapes).

My question:
- Do you think this can be usefull to someone, and this is worth to be shared ?
- As there are many files, what is the best way to share it ? (wiki is not very appropriate for 10/12 files, I believe).

I can add some screenshots if necessary.

Thanks

Post by **sinbad** » Mon Apr 24, 2006 1:38 pm

You could include some snippet examples / headers in the wiki and upload the full source as a zip, the wiki supports file uploads.

Post by **jacmoe** » Mon Apr 24, 2006 5:16 pm

Sphinkie, this is definately wanted!

It goes directly into OgreOpcode.

If I may.

And OGRE Wiki of course.

If you think so.

SpannerMan · Post by **SpannerMan** » Mon Apr 24, 2006 8:00 pm

Yes, that sounds very useful sphinkie, please wikify it.

Cheers!

sphinkie · Post by **sphinkie** » Mon Apr 24, 2006 10:46 pm

jacmoe: yes, you can use it for ogreopcode, but wait a little bit maybe, because I have to clean the code first ...

I have created the wiki page here, http://www.ogre3d.org/wiki/index.php/GeometricMesh
but it's not finished yet.... I'll need a few days .

Post by **jacmoe** » Tue Apr 25, 2006 5:13 pm

sphinkie wrote:jacmoe: yes, you can use it for ogreopcode, but wait a little bit maybe, because I have to clean the code first ...

Unclean code fits right into OgreOpcode!

Could be very cool to have this in RC1 (to be released by the end of May).

sphinkie · Post by **sphinkie** » Wed Apr 26, 2006 8:28 am

OK: I am posting the sources files today (in the wiki) but be aware that this is not a final version.

I have called it WIP-01 and be aware that some comments will not be up-to-date, and that the source files may contain some functions or class that are unused...

The source files are doxygen compatible.

With this, you can have an an idea of what the library can do, and how to integrate it in your projet.

sphinkie · Post by **sphinkie** » Wed Apr 26, 2006 10:35 pm

Well, it is done.

The version 1.0 is now available on wiki.
http://www.ogre3d.org/wiki/index.php/GeometricMesh

Enjoy

Post by **jacmoe** » Wed Apr 26, 2006 11:09 pm

Wow, this is really appreciated!

Looking forward to tinker with that code.

batomaeus · Post by **batomaeus** » Tue Aug 01, 2006 1:48 pm

Hi!
I experienced problems with the sphere class. There are some rays flickering nervously around. Here are two screenshots:

Do you know why that could occur?
Greets

sphinkie · Post by **sphinkie** » Tue Aug 01, 2006 4:42 pm

wireframe seems OK.

in the first view, all the rectangles are inexpected, or some of them are yours ?

batomaeus · Post by **batomaeus** » Wed Aug 02, 2006 10:25 am

no, i didn't change the code (except that I commented lines like
TRACE(". mTriangles["+ITOA(index)+"].cornerA = "+ITOA(i));
out, because my linux-compiler didn't like the ITOAs).
For me, both pictures seem to be not OK: The rays in the wireframe-pic that radiate from the center of the sphere are not intended, they were generated from the sphere-class (as well as the rects in the first view). They are also flickering. Strangely, these rays (and also the surfaces if wireframe is not activated) are sometimes there, sometimes they dissapear - this also depends on the initial position of the camera.

sphinkie · Post by **sphinkie** » Fri Aug 04, 2006 10:50 pm

strange...
I didn't see these artefacts before.
I just remember there is a bug with some even frequencies.
Also, I am using Ogre 1.2.0 with MS-windows.

Also, now, with the new functionnality of Ogre (called "MeshFactory" if I remember well), this component could surely be rewritten more efficiently.

Sorry, but I can't help you more, I'm leaving for 1 month holydays....

big_o · Post by **big_o** » Fri Aug 04, 2006 11:23 pm

Unclean code fits right into OgreOpcode!

I've been using the old sphere code form the wiki for the same purpose, but now I might give this method a try!

MKM · Post by **MKM** » Fri Feb 23, 2007 11:31 am

It sounds pretty interesting but the link to the zip file seems to be dead. Could someone give a mirror link ?

Thx

sphinkie · Post by **sphinkie** » Mon Feb 26, 2007 6:09 pm

link corrected

detox · Post by **detox** » Tue Feb 27, 2007 3:17 pm

Thank you for sharing the code. I know I'll find it very useful.

Post by **:wumpus:** » Wed Feb 28, 2007 3:41 pm

batomaeus wrote:no, i didn't change the code (except that I commented lines like
TRACE(". mTriangles["+ITOA(index)+"].cornerA = "+ITOA(i));
out, because my linux-compiler didn't like the ITOAs).
For me, both pictures seem to be not OK: The rays in the wireframe-pic that radiate from the center of the sphere are not intended, they were generated from the sphere-class (as well as the rects in the first view). They are also flickering. Strangely, these rays (and also the surfaces if wireframe is not activated) are sometimes there, sometimes they dissapear - this also depends on the initial position of the camera.

This tends to happen if the vertex buffer is larger than what goes into it (so vertices are created from random data), or some buffer overflow occurs. For example, rendering a larger range than represented the vertex buffer.

You should check the buffer sizes, draw ranges etc...

howfine · Post by **howfine** » Wed Nov 12, 2008 10:43 am

The source code cannot download!
Can you send it to my email:howfine@126.com.
Thank you very much!

radman · Post by **radman** » Thu Jan 08, 2009 2:26 am

Better, can you give a real, useable link for the rest of the community?

Thanx in advance.

zuur · Post by **zuur** » Mon Aug 03, 2009 10:11 am

The link to this code appears to be broken (again by the looks).. Does anyone have a link to it that works still, or a copy of the code?

jacmoe, did you end up getting a copy of this for Ogre Opcode? (I downloaded the latest Ogre Opcode source, but couldn't see it there)

Any help is *really* appreciated..

Thanks,

Post by **jacmoe** » Tue Aug 04, 2009 12:21 am

Unfortunately not

I am not even sure if I've got it lying around somewhere, but I'll keep it in mind..

zuur · Post by **zuur** » Thu Aug 06, 2009 4:49 am

Anyone?

Any ideas on where else to look to find code to generate a geometric sphere?

Post by **xavier** » Thu Aug 06, 2009 5:24 am

DX SDK sample code? Haven't checked but there's a lot of good code in there...

zuur · Post by **zuur** » Fri Aug 07, 2009 12:50 am

okay, thanks for the feedback guys - I'll have a look through the DX SDK.

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