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Messages - Jonas

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Projects / Re: 3DCov(Java3d->jpct port)
« on: January 01, 2008, 09:03:43 pm »
We don't have a homepage, and I doub't that anything is planned. I will ask after holidays are over though.

edit: Just tried nicely and really looks good. Rendering is smooth. However, it kinda breaks picking(do i have to scale the x/y position im using at reprojection or something?)..didn't investigate it any further.

edit2: Yep, didn't scale. Seems to work great now. ;D

Projects / Re: 3DCov(Java3d->jpct port)
« on: January 01, 2008, 04:48:44 pm »
Loop yes, as fast as possible no(that be a lot higher fps). The target fps is set to 20.

Changing to an event based rendering is something I wanted to do, but implementing all functionality was
more important and took up all our time(which wasn't that much to begin with anyway :D).

Projects / 3DCov(Java3d->jpct port)
« on: January 01, 2008, 01:03:16 pm »
As part of a term project, a friend and I been working on porting a little visualisation tool from Java3d over to jpct(pure software mode) the last ~2-3 weeks.
This was done because people kept having troubles running it under Java3d. The new version runs suprisingly smooth(given
a few things are probably implemented quite inefficient ;D due to lack of time) even on low end computers.

The tool's named 3DCov and is used to visualize the relation between classes and objects(for OO beginners). Following a few screens of a loaded diagram:

2d/3d view. 2d is done using JGraph
Some classes/objects moved around
Popup menu
Labels(multiplicity, roles, ...)

Happy new year everyone :)

News / Re: New version of...myself!
« on: December 17, 2007, 11:10:03 am »
Congrats! und alles gute euch!

Projects / Collada loader + and others
« on: November 18, 2007, 08:48:14 pm »
I started working on a collada loader(because..well..I had no other project idea ;D) a few weeks ago. I didn't get very far, mainly because I kinda lost interest in it and lack of time.

It currently doesen't do much more than loading basic(mesh) geometrie.

Some pictures:


* supporting a subset of the effects librarie(correct texturing ..the one on the duck is applied after loading the model)
* light, camera and scene loading(so you get a configured world instead of object3d's)
* complex geometrie
* ...collada is huge :)

I don't think that I'll work on it again soon. If anyone is interested in the source ill upload it.

Support / Re: Object space rotation
« on: November 15, 2007, 08:26:01 am »

Thanks, that helped pin down the error. I actually built the object and reset the pivot, but had another buildAllObjects() in the scene load code, which reset the pivot again ;D.

Works now.

Support / Object space rotation
« on: November 14, 2007, 07:29:13 pm »

Having trouble with what i think is pretty basic ;D. I most probably just dont understand how rotation works.. :).

Im trying to draw some axis I made my own arrow object3d and added it to a scene(see picture..the negativ y one is the original).
Now Id like to rotate that arrow to align it with the other axis. When i do the following:

Code: [Select]
o3ds[0] = createArrow();
       o3ds[1] = createArrow();
       o3ds[2] = createArrow();

it looks like this: there a way to rotate these arrow so I dont have to translate them back in position(sphere is 0,0,0)? I tried setting the pivot and center of the arrow inside the sphere(which is the origin of the axis arrow too) but it doesent seem to work either.

Support / Re: Textures on triangles and textures in general
« on: November 10, 2007, 10:57:02 am »

If you create your own object with triangles, you have to somehow tell the engine how to map a texture's picture information on to that object. This can be done by assigning UV coordiantes(UV really being x and y coordinates in % in a texture-> between 0 and 1) to the 3d geometry(vertices).

There several ways to assign UV coordiantes to your geometry:

You can do it like Kearnan, and let the engine calculate it for you(which might sometimes look a bit wierd), or by adding this information together with the vertices information of the triangle(often the case when using model loaders).

Following a simple example of a selfmade cube(probably the most awkward way of doing it heh). It only maps a texture on the two top triangles of the box. I'd go with automatic mapping though^^

Code: [Select]
/** Creates a box, which maps any given texture on to the top of the box */
    public static Object3D createBoxTextTop(float size, int texId)
        Object3D box = new Object3D(12);
        SimpleVector[] sv = new SimpleVector[8];
        /* The 8 vertices of the box */
        sv[0] = new SimpleVector(0, 0, 0);
        sv[1] = new SimpleVector(size, 0, 0);
        sv[2] = new SimpleVector(size, size, 0);
        sv[3] = new SimpleVector(0, size, 0);
        sv[4] = new SimpleVector(0, 0, size);
        sv[5] = new SimpleVector(size, 0, size);
        sv[6] = new SimpleVector(size, size, size);
        sv[7] = new SimpleVector(0, size, size);
        /* Add the triangles counter-clockwise(so they face "outside") */

        /* These are the 2 top triangles, which have a texture assigned(texId is the texture ID returned from a texmanager).
             In this case its easy to map the texture, since the two triangles should show the whole texture

        box.addTriangle(sv[4], 0f, 0f, sv[1], 1f, 1f, sv[5], 1f, 0f, texId);
        box.addTriangle(sv[4], 0f, 0f, sv[0], 0f, 1f, sv[1], 1f, 1f, texId);
        return box;

Support / Re: Render text onto an object3d
« on: November 06, 2007, 04:09:12 pm »
For writing text into a texture, you may use an ITextureEffect that you fill with the pixels from a BufferedImage each time you write new text into that BI.

That did the trick, thank you!

Support / Re: Render text onto an object3d
« on: November 03, 2007, 07:49:25 pm »
You could use the Object3D.setAdditionalColor(java.awt.Color) to make the surface seem brighter. Works pretty well for me, I use it for stuff like buttons that should appear to glow in a dark environment. You can see an example in the latest screenshots in this thread -- the lights and red orb in there have additional colors.

Thanks thats what I ment.

Support / Render text onto an object3d
« on: November 03, 2007, 04:32:02 pm »
I'm porting a visualisation tool from Java3d to jpct, and am currently working on a prototype.

So far everything works fine, and most functionality is alrdy ported, except one major thing which i couldn't solve yet.

1. I need to project dynamic generated text on a box(see picture). Is there a clever way of doing that in jpct?

2. The boxes need to "glow"(e.g. get brigther) once selected. Whats the proper way of doing that in software mode? Use a texture effect? Anyone did something like that befor?:)


it should look like this:

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