Re: [JAVA3D] Screen resolution und Java3D

Hi, Eric thank you very much for your answer. I agree whith you that I will always have this stepping effects. But I mean, that my image must looks at high resolution better. I mean that Canvas3D must take the configuration of my graphics hardware from: GraphicsConfigTemplate3D gct3d =

Re: [JAVA3D] Screen resolution und Java3D

Hey Eric and Olga, This 'stepping' is known as aliasing, or more fondly as 'jaggies'. There are blending techniques to reduce the effect, called anti-aliasing. This is an expensive operation and most hardware does not support it yet. This is really a problem with drawing lines or edges that

[JAVA3D] FW: [JAVA3D] JSplitPane and Canvas3D

Andreas, The solution to your problem is to extend the canvas and override two methods which control the size of the canvas. (This applies to Canvas and Canvas3D). I'm not sure if this is a lightweight/heavyweight problem or a problem with layout. Add the following code to your canvas subclass

Re: [JAVA3D] JSplitPane and Canvas3D

Hi Andrew, Andrew Phelps wrote: > The solution to your problem is to extend the canvas and override two > methods which control the size of the canvas. (This applies to Canvas and > Canvas3D). I'm not sure if this is a lightweight/heavyweight problem or a > problem with layout. > Add the follo

[JAVA3D] JSplitPane and Canvas3D

hello, In the right side you put a JPanel and inside the Canvas3D and you have to set minimumSize to the Jpanel olivier Fabregue [EMAIL PROTECTED] === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body

Re: [JAVA3D] JSplitPane and Canvas3D

Andreas, I understood your problem. It is not the splitframe that you need worry about. The splitframe is passing any resize callback to the canvas, but for some reason the canvas's internal minimum size is being set to the canvas's size every time the canvas is enlarged, thus preventing you fro

Re: [JAVA3D] JSplitPane and Canvas3D

Hi Andrew, sorry for beeing stupid! :-( I should have first try out what you said. Andrew Phelps wrote: > I understood your problem. > It is not the splitframe that you need worry about. The splitframe is > passing any resize callback to the canvas, but for some reason the canvas's > internal

Re: [JAVA3D] Memory Leak?

Ouch that sounds like a bad one, glad to hear you guys are hard at work. In my case, if I remember it correctly, I did not have a transform group. In this case I just had a bunch of shapes under a BranchGroup, and I was detaching the BranchGroup. I solved the problem by turning off compilation

[JAVA3D] Fade-out of transparency textured polygons

A while back I fought with the settings to make transparency textures work. I could easily place the texture on the polygon, but the places where the alpha value of the texture was 0, it showed the color of the polygon. It didn't make sense to me that I could see the underlying polygon at all.

[JAVA3D] Advanced Features

Hi all, Can anyone tell me whether or not the following features are supported by Java3D: * Collision detection * Shadowing * Camera imaging such as: * simulation of depth of field effects, i.e., blurred effects when images are out of focus * simulati

Re: [JAVA3D] Fade-out of transparency textured polygons

Hmmm, Two ways: 1) Interesting way but probably not what you want is to set the color of the vertex to include an alpha component and fade across your vertices, using modulate with the texture. I know this works in opengl, I assume it does in Java3d. 2) The next way is to use a transparent pol

Re: [JAVA3D] BUMP: FOV and Occlusion culling

Java 3D performs view frustum culling, only sending geometry that is within the viewing frustum to the graphics accelerator. We have done research into general purpose occlusion culling, but it isn't currently in Java 3D (nor is it currently planned for the 1.3 version). -- Kevin Rushforth Java

Re: [JAVA3D] Advanced Features

> * Collision detection --> yes. But you might have to do some work > to handle "preemptive cd", in other words, check for collisions before > letting the user move instead of waiting for a behavior to trigger with > the collision event. > > * Shadowing -> not real time casted shadows

[JAVA3D] Fixed Directional Light Source

Hi, I am trying to fix a directional light source at eyepoint, ie going into screen at all times. This is so when I rotate image on screen, light source is still remaining fixed and always pointing into screen. The problem know is directional light source follows the object as I rotate it with

Re: [JAVA3D] Advanced Features

Thanx david ! -->-Original Message- -->From: Yazel, David J. [mailto:[EMAIL PROTECTED]] -->Sent: dinsdag 19 september 2000 16:36 -->To: [EMAIL PROTECTED] -->Subject: Re: [JAVA3D] Advanced Features --> --> -->> * Collision detection --> yes. But you might have -->to do some work -->

Re: [JAVA3D] BUMP: FOV and Occlusion culling

Thank you! So to dig a bit further, what is the level of granularity for your fov culling: Shape, Geometry Array, polygon or vertice? If you have a shape 3d that has 20k points and one vertice of that overlaps the view frustum, is it all sent? Are there two stages of culling, one by shape then

Re: [JAVA3D] Fixed Directional Light Source

Try putting the light in the same transform group as the view, don't put the light in the transform/branch group of your geometry. Dave Yazel > -- > From: Bradley Crouch[SMTP:[EMAIL PROTECTED]] > Reply To: [EMAIL PROTECTED] > Sent: Tuesday, September 19, 2000 10:53 AM

[JAVA3D] How to use quaternion in J3D?

How to use quaternion to do rotation about an arbitrary axis in Java3D? e.g: Quat4f __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com ===

[JAVA3D] Source code for core J3D

Hello, Quite a bit of the javax.media.j3d.* and javax.vecmath.* classes would probably be implemented as native code. Still, is the Java source code for those classes available anywhere ? Any amount, however small, of non-native code would be helpful. Thanks in advance, Regards, Manu.

Re: [JAVA3D] Fade-out of transparency textured polygons

I mentioned that my polygon was already fully transparent to support the alpha channel texture. The alpha component of the polygon does not seem to affect the transparency of the texture when the texture has an alpha channel. I guess I could also be more specific. When I say "fade-out", I mean

Re: [JAVA3D] How to use quaternion in J3D?

Someone posted once that you cannot rotate around an arbitrary point in Java3d. You must rotate around the origin and then translate. I have not personally confirmed this. Dave Yazel > -- > From: Siau Tan Long[SMTP:[EMAIL PROTECTED]] > Reply To: Discussion list for Java 3D

Re: [JAVA3D] Fixed Directional Light Source

Hi, One way I can think of is to add the light source and the target transform group for the behaviors as separate branches of the scene graph. That is, the light source should not be a direct descendant of the transform group that is affected by PickRotateBehavior, etc. I assume that the mouse

Re: [JAVA3D] Fade-out of transparency textured polygons

Ah! hehe, I thought you meant over distance. I have not "faded out" a polygon over time. This is what I would try: do not make the polygon transparent, instead modulate a completely opaque texture on your polygon. Since we are modulating, changes to the colors of the polygon should mixed with t

[JAVA3D] Billboard using Z-axis

I'm playing with using BillBoard... whenever I set the bb.setAlignmentAxis(0f, 0f, 1f ) to select the Z-axis, the object DISAPPEARS. If I take the axis a LITTLE off the Z: float D = 0.001f; bb.setAlignmentAxis( 0f, D, Math.sqrt(1f - D*D) ); It works fine. What's wrong with using EXACTLY

Re: [JAVA3D] Fixed Directional Light Source

Hi Dave Thanks for the quick reply.. now that is service.. I will try the solution, once again thanks.. Brad > Try putting the light in the same transform group as the view, don't put > the light in the transform/branch group of your geometry. > > Dave Yazel ==

Re: [JAVA3D] Billboard using Z-axis

I will quote someone here: QUOTE (Hongkun Wang): "Hi , Dave Yazel Thanks for your help. I already resolve the trees rendering. I am using: (1) Put all trees in a OrderedGroup, and use SharedGroup to save memory. (2) Figure out all trees according 'Z' coordinate in viewplatform coordinate SYS.

Re: [JAVA3D] Attribute change performance Issue.

> From: Norihito Hiruma <[EMAIL PROTECTED]> > > From Doug Gehringer <[EMAIL PROTECTED]> > > When making many changes to the scene graph outside of a behavior there > > is no way for Java3D to know when you are done and Java3D will probably > > update before you are ready. > > Stopping/starting t

Re: [JAVA3D] [FAQ] Source code for core J3D

Manu Eapen Varghese wrote: > > Hello, > > Quite a bit of the javax.media.j3d.* and javax.vecmath.* classes would > probably be implemented as native code. Still, is the Java source code for > those classes available anywhere http://www.j3d.org/faq/running.html#source Short answer is - no, and ne

Re: [JAVA3D] Fade-out of transparency textured polygons

I can't switch to an opaque texture. For example, a texture of a tree *MUST* have an alpha component. I've faded-out polygons over time before... no big deal. Just adjust the TransparencyAttributes of the Appearance. By the way, I am *modulating* the texture with the object. This allows for *

Re: [JAVA3D] Fade-out of transparency textured polygons

Yeppers. Looks like you are on to something here. Sorry I could not have been more help. Dave > -- > From: J. Lee Dixon[SMTP:[EMAIL PROTECTED]] > Reply To: Discussion list for Java 3D API > Sent: Tuesday, September 19, 2000 12:59 PM > To: [EMAIL PROTECTED] > Subjec

Re: [JAVA3D] How to use quaternion in J3D?

> How to use quaternion to do rotation about an arbitrary axis in Java3D? > e.g: Quat4f A good introduction to quaternions is at: http://www.gamasutra.com/features/programming/19980703/quaternions_01.htm To rotate about an arbitrary axis, AxisAngle4f is probably a better bet, the fields of Axis

Re: [JAVA3D] How to use quaternion in J3D?

Warning! I do this quite a bit in one of my Java 3D apps. I found that the Quat4f get normalized regardless of the initial coordinates I use. So I end up setting the length of the quaternion after I instantiated it. Note that *all* vectors can be thought of as having one "end" at the origin an

[JAVA3D] Behavior.postID() was Re: [JAVA3D] Attribute change performance Issue.

Hi Doug, I don't understand this technique completely. The docs on Behavior.postID() are very terse. "Post the specified Id. Behaviors use this method to cause sequential scheduling of other behavior object" That's it. Is it a priority system? What number = first? Why does using postId()

Re: [JAVA3D] Billboard using Z-axis

> I'm playing with using BillBoard... whenever I set the > > bb.setAlignmentAxis(0f, 0f, 1f ) > > to select the Z-axis, the object DISAPPEARS. The alignment axis is relative to the eye. The eye looks along the Z-axis, so that if you align to that the Billboard is always edge-on, which is why it

Re: [JAVA3D] Billboard using Z-axis

I have my "avatar" roaming the x-y plane, z being up. When I set the alignment axis to *nearly" the z-axis, this axis goes through all the transforms to get it into eye coordinates... which is almost the y-axis in eye coordinates. I don't believe the alignment axis is relative to the eye-coordin

Re: [JAVA3D] Billboard using Z-axis

I don't think Lee is having a good day, we keep misunderstanding his scenarios, and then we suggest things he has already tried. :( > -- > From: J. Lee Dixon[SMTP:[EMAIL PROTECTED]] > Reply To: Discussion list for Java 3D API > Sent: Tuesday, September 19, 2000 2:50 P

[JAVA3D] Collision Detection Challenges

I'm using Java3D 1.2 (have tried both OpenGL and DirectX), and am having the following problems with collision detection: * The time at which a collision is reported is inaccurate (the parts might be visually apart by a significant amount). What capabilities need to be enabled to get ACCURATE col

Re: [JAVA3D] Billboard using Z-axis

Yeah, I guess. I kinda feel like I'm delving into parts of Java3D that other ppl aren't using. Oh well, I'm happy that I'm helping to make Java3D more robust. Although, I am trying to put out a product... :) Really need to be able to draw pictures!! ;) Thanks for all the help & patience...

[JAVA3D] Curve Trajectory Interpolator.

How can I specify a figure to follow a curve trajectory between to points? Thanks in advance. -- Alejandro Sanchez Tel (02293)15640639 - 14 de julio 417 Tandil - Buenos Aires - Argentina === To unsubscribe, send email to [EM

Re: [JAVA3D] Collision Detection Challenges

John, The answer is you can't. What I believe most of us are doing in order to have accurate collision detection is to use picking to detect collisions. For instance in our application the avatar sends out a pickray in the direction it is walking *before* it moves to make sure it's a valid move

[JAVA3D] storing J3d objects in RDB

hi all!!! Has anyone tried storing a J3d object (Shape3D, for ex) in a relational database like Oracle8i? Is it possible, first of all??? Thanx. Ajit Apt #2, 911, Franklin Avenue, Normal, IL 61761, USA. (Phone) 001-309-438-3743. Get free email and a permanent address at http://www.amexmail

Re: [JAVA3D] Behavior.postID() was Re: [JAVA3D] Attribute change performance Issue.

> From: "Shawn Kendall" <[EMAIL PROTECTED]> > I don't understand this technique completely. The docs on Behavior.postID() > are very terse. > > "Post the specified Id. Behaviors use this method to cause sequential > scheduling of other behavior object" The basic idea is that Behavior.postID() i

Re: [JAVA3D] Collision Detection Challenges

John Wright wrote: > What I believe most of us are doing in order to have accurate collision > detection is to use picking to detect collisions. For instance in our > application the avatar sends out a pickray in the direction it is > walking *before* it moves to make sure it's a valid move. Th

Re: [JAVA3D] storing J3d objects in RDB

Ajit Dharmik wrote: > Has anyone tried storing a J3d object (Shape3D, for ex) in a > relational database like Oracle8i? > > Is it possible, first of all??? No, it is not possible because you cannot serialise any part of the J3D scenegraph. You will need to create your own geometry format/table s

[JAVA3D] Drawing a 3D Mathematical Function

This is a report -- I'm not confident that my first post went through. (Sorry if you have already seen this.) Any suggestions would be greatly appreciated. Feel free to e-mail me directly at [EMAIL PROTECTED] Thanks! -Original Message- From: Scott S. Lynde [mailto:[EMAIL PROTECTED]] Se

Re: [JAVA3D] Collision Detection Challenges

The other way to handle this is to use multiresolution grids. You place your objects into your world and "register" them into your own data structure. Registering them is basically placing the scene graph "piece" into the grid (and of course you can use a more 3 dimensional octree for inside).

Re: [JAVA3D] Collision Detection Challenges

Dear Mr. Couch, Could you give me some collision detection examples, or where can I get source code about collision detection? Thanks a lot Jiang Minhua - Original Message - From: "Justin Couch" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, September 20, 2000 7:42 AM S

Re: [JAVA3D] Collision Detection Challenges

Canoe wrote: > Could you give me some collision detection examples, or where can I get source code >about collision detection? Unfortunately I don't have any handy and j3d.org doesn't seem to have any links to tutorials etc. I thought my Raw J3D tutorial had a whole bunch of code there (I remem