Thanks!

I opened the class RenderTargetPeer and changed from:

Code:

    private final void finishRenderTarget( TextureRenderTarget renderTarget )
    {
        if ( renderTarget.isPixelReadbackEnabled() )
        {
            Texture2D texture = (Texture2D)renderTarget.getTexture();
           
            ByteBuffer bb = texture.getImage0().getDataBuffer();
            if ( bb != null )
            {
      GL11.glReadPixels( 0, 0, texture.getWidth(), texture.getHeight(), texture.getFormat().hasAlpha() ? GL11.GL_RGBA : GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, bb );
            }
        }
       
        GL11.glPopAttrib();
        // TODO: (cylab 07-11-18) should only be called to return to the normal rendering, not between framebuffers
        EXTFramebufferObject.glBindFramebufferEXT( EXTFramebufferObject.GL_FRAMEBUFFER_EXT, 0 );
    }

to:

Code:

private final void finishRenderTarget( TextureRenderTarget renderTarget )
    {
        if ( renderTarget.isPixelReadbackEnabled() )
        {
            Texture2D texture = (Texture2D)renderTarget.getTexture();
           
            ByteBuffer bb = texture.getImage0().getDataBuffer();
            if ( bb != null )
            {
                // checking if it's a depth texture
            if (texture.getFormat() == TextureFormat.DEPTH) {
            GL11.glReadPixels( 0, 0, texture.getWidth(), texture.getHeight(), GL11.GL_DEPTH_COMPONENT, GL11.GL_UNSIGNED_BYTE, bb );
            } else {
            GL11.glReadPixels( 0, 0, texture.getWidth(), texture.getHeight(), texture.getFormat().hasAlpha() ? GL11.GL_RGBA : GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, bb );
            }
            }
        }
       
        GL11.glPopAttrib();
        // TODO: (cylab 07-11-18) should only be called to return to the normal rendering, not between framebuffers
        EXTFramebufferObject.glBindFramebufferEXT( EXTFramebufferObject.GL_FRAMEBUFFER_EXT, 0 );
    }

And It seems my problem reading the the DEPTH BUFFER from a texture is solved.


PS = I'm using LWJGL

I feel ashamed of myself. I was mistaken again... I was misusing the Tranform3D class and thought I found I bug...

Sorry for the inconvenience,
[]'s

When I have more than one child to be copied everything runs fine.

Actually, it works fine only when i have two or more transform groups with shapes as children.

I have the following situation:

I'm copying new branch groups to the root of my scenegraph at runtime.

Code:

          public static void copyAndInvalidateSource(BranchGroup destination, BranchGroup source) {
List<Node> children;

if (source == null || destination == null) {
throw new IllegalArgumentException();
}

destination.removeAllChildren();
children = new ArrayList<Node>();
for (int i = 0; i < source.numChildren(); i++) {
children.add(source.getChild(i));
}

source.removeAllChildren();
for (Node child : children) {
destination.addChild(child);
}

destination.setIsOccluder(source.isOccluder());
// TODO: bad hack!
                PrivateAccessor.setPrivateField(destination, "boundsDirty", true);
                destination.updateBounds(true);
                destination.setPickable(source.isPickable());
                destination.setPickable(source.isRenderable());
}

When I have only ONE child to be copied, and it's a transform group, looks like the transform matrix is not being updated...

When I have more than one child to be copied everything runs fine.

Do you know why this may be happening?

Att,

Olá camaradas Brasileiros,

  Vocês existem mesmo?

Abçs,

Marvin,

  Indeed I was getting the color + alpha buffer correctly from the texture. I was confused by a little mistake I made with the Java2D ColorModel when tried to copy it to a BufferedImage...
 
  I'm getting another error now: when I try to set the pixelReadbackEnabled to a render target which texture is in the DEPTH format.
ie.:

Code:

depthTexture = TextureCreator.createTexture(TextureFormat.DEPTH, screenWidth, screenHeight);

(...)

renderer.addRenderTarget(new TextureRenderTarget(root, depthTexture, true), renderPass.getConfig());

The first time I render it I get the following error:

Code:

org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
at org.lwjgl.opengl.Util.checkGLError(Util.java:56)
at org.lwjgl.opengl.GL11.glReadPixels(GL11.java:2611)
at org.xith3d.render.lwjgl.RenderTargetPeer.finishRenderTarget(RenderTargetPeer.java:236)
at org.xith3d.render.lwjgl.RenderTargetPeer.finishRenderTarget(RenderTargetPeer.java:281)
at org.xith3d.render.lwjgl.RenderPeerImpl.renderRenderPass(RenderPeerImpl.java:760)
at org.xith3d.render.lwjgl.RenderPeerImpl.render(RenderPeerImpl.java:843)
at org.xith3d.render.lwjgl.CanvasPeerImplBase.doRender(CanvasPeerImplBase.java:331)
at org.xith3d.render.lwjgl.CanvasPeerImplNative.initRenderingImpl(CanvasPeerImplNative.java:628)
at org.xith3d.render.DefaultRenderer.doRender(DefaultRenderer.java:524)
at org.xith3d.render.DefaultRenderer.renderOnceInternal(DefaultRenderer.java:686)
at org.xith3d.render.DefaultRenderer.renderOnce(DefaultRenderer.java:819)
at org.xith3d.base.Xith3DEnvironment.render(Xith3DEnvironment.java:501)
at org.xith3d.loop.RenderLoop.renderNextFrame(RenderLoop.java:619)
at br.edu.univercidade.cc.xithcluster.Renderer.loopIteration(Renderer.java:135)
at org.xith3d.loop.RenderLoop.update(RenderLoop.java:698)
at org.xith3d.loop.UpdatingThread.nextIteration(UpdatingThread.java:487)
at org.xith3d.loop.RenderLoop.nextIteration(RenderLoop.java:709)
at org.xith3d.loop.RenderLoop.loop(RenderLoop.java:762)
at org.xith3d.loop.UpdatingThread.run(UpdatingThread.java:540)
at org.xith3d.loop.RenderLoop.run(RenderLoop.java:785)
at org.xith3d.loop.RenderLoop.begin(RenderLoop.java:841)
at br.edu.univercidade.cc.xithcluster.Renderer.begin(Renderer.java:87)
at org.xith3d.loop.RenderLoop.begin(RenderLoop.java:871)
at br.edu.univercidade.cc.xithcluster.Renderer.main(Renderer.java:181)
org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
at org.lwjgl.opengl.Util.checkGLError(Util.java:56)
at org.lwjgl.opengl.GL11.glReadPixels(GL11.java:2611)
at org.xith3d.render.lwjgl.RenderTargetPeer.finishRenderTarget(RenderTargetPeer.java:236)
at org.xith3d.render.lwjgl.RenderTargetPeer.finishRenderTarget(RenderTargetPeer.java:281)
at org.xith3d.render.lwjgl.RenderPeerImpl.renderRenderPass(RenderPeerImpl.java:760)
at org.xith3d.render.lwjgl.RenderPeerImpl.render(RenderPeerImpl.java:843)
at org.xith3d.render.lwjgl.CanvasPeerImplBase.doRender(CanvasPeerImplBase.java:331)
at org.xith3d.render.lwjgl.CanvasPeerImplNative.initRenderingImpl(CanvasPeerImplNative.java:628)
at org.xith3d.render.DefaultRenderer.doRender(DefaultRenderer.java:524)
at org.xith3d.render.DefaultRenderer.renderOnceInternal(DefaultRenderer.java:686)
at org.xith3d.render.DefaultRenderer.renderOnce(DefaultRenderer.java:819)
at org.xith3d.base.Xith3DEnvironment.render(Xith3DEnvironment.java:501)
at org.xith3d.loop.RenderLoop.renderNextFrame(RenderLoop.java:619)
at br.edu.univercidade.cc.xithcluster.Renderer.loopIteration(Renderer.java:135)
at org.xith3d.loop.RenderLoop.update(RenderLoop.java:698)
at org.xith3d.loop.UpdatingThread.nextIteration(UpdatingThread.java:487)
at org.xith3d.loop.RenderLoop.nextIteration(RenderLoop.java:709)
at org.xith3d.loop.RenderLoop.loop(RenderLoop.java:762)
at org.xith3d.loop.UpdatingThread.run(UpdatingThread.java:540)
at org.xith3d.loop.RenderLoop.run(RenderLoop.java:785)
at org.xith3d.loop.RenderLoop.begin(RenderLoop.java:841)
at br.edu.univercidade.cc.xithcluster.Renderer.begin(Renderer.java:87)
at org.xith3d.loop.RenderLoop.begin(RenderLoop.java:871)
at br.edu.univercidade.cc.xithcluster.Renderer.main(Renderer.java:181)

No problem, my friend

Thanks for the suggestion. I'll implement it and see if it works! Anyway I'll post my results here soon.

[]'s

My code is based on the code of some of the tests.

Here's an excerpt from the "RenderToTextureTest" code:

Code:

sceneGraph.getRenderer().addRenderTarget( renderTarget, rp.getConfig() );

Where the "sceneGraph" reference is:

Code:

Xith3DEnvironment env = new Xith3DEnvironment( 0f, 0f, 5f,
                                                       0f, 0f, 0f,
                                                       0f, 1f, 0f,
                                                       this
                                              );

BTW, I'm doing:

Code:

renderer.addRenderTarget(new TextureRenderTarget(root, colorAndAlphaTexture, backgroundColor, true), [b]renderPass.getConfig()[/b]);

And I took the care of registering the render target, canvas, etc. in the same order the examples do.

IMHO, the only thing I'm doing really differently is that I'm adding the scene elements at runtime. I have the following methods

Code:

public void updateScene(View view, List<Light> lightSources, BranchGroup newRoot) {
        for (Light lightSource : lightSources) {
newRoot.addChild(lightSource);
}

// TODO: Check this!
ViewHelper.copy(view, getXith3DEnvironment().getView());

[b]setRoot(newRoot);[/b]
}

private void setRoot(BranchGroup newRoot) {
org.xith3d.render.Renderer renderer;
Colorf backgroundColor;
RenderPass renderPass;

if (root != null) {
getXith3DEnvironment().removeBranchGraph(root);
}

root = newRoot;

renderPass = getXith3DEnvironment().addPerspectiveBranch(root);

backgroundColor = new Colorf(0f, 0f, 0f, 0.1f);

colorAndAlphaTexture = TextureCreator.createTexture(TextureFormat.RGBA, screenWidth, screenHeight, backgroundColor);
depthTexture = TextureCreator.createTexture(TextureFormat.DEPTH, screenWidth, screenHeight);

renderer = getXith3DEnvironment().getRenderer();

renderer.addRenderTarget(new TextureRenderTarget(root, colorAndAlphaTexture, backgroundColor, true), renderPass.getConfig());
renderer.addRenderTarget(new TextureRenderTarget(root, depthTexture), renderPass.getConfig());
}

And he may be called concurrently with the "loopIteration". I created a simple mutex to guard the scene:

Code:

private void rebuildScene(View view, List<Light> lightSources, BranchGroup geometries) {
synchronized (renderer.getSceneLock()) {
renderer.updateScene(view, lightSources, geometries);
}
}

(...)

@Override
protected void loopIteration(long gameTime, long frameTime, TimingMode timingMode) {
super.prepareNextFrame(gameTime, frameTime, timingMode);

if (networkManager.startFrame()) {
synchronized (sceneLock) {
super.renderNextFrame(gameTime, frameTime, timingMode);
                    networkManager.sendColorAlphaAndDepthBuffers(readBytesFromTexture(colorAndAlphaTexture), readBytesFromTexture(depthTexture));
}
}
}
[code]

[/code]

Hi

During the initialization of my code I'm setting a texture as a render target.

Code:

colorAndAlphaTexture = TextureCreator.createTexture(TextureFormat.RGBA, DEFAULT_WIDTH, DEFAULT_HEIGHT);

renderer = getXith3DEnvironment().getRenderer();

renderer.addRenderTarget(new TextureRenderTarget(root, colorAndAlphaTexture, backgroundColor, true), new BaseRenderPassConfig());

After rendering a frame I try to access its data:

Code:

byte[] buffer;
buffer = new byte[texture.getTextureCanvas().getImage().getDataSize()];
texture.getTextureCanvas().getImage().getData(0, 0, buffer);

But unfortunately the resulting byte array above doesn't seem to represent the actual scene pixels. All array is all set like the following: (0,0,0,-27,0,0,0,-27,0,0,0,-27,0,0,0,-27,...)

Do you know what I'm doing wrong?

I'm starting with the code. It can be found at:

https://github.com/pboechat/xithcluster

I'll try to translate my monography that gives some explanation about the implementation.

The next 6 months I'll try to reach an useable product with a closed scope.

[]'s

Just what i needed. Thanks a lot!

Plain simple question: how can I attach custom data to a node? (ie.: an integer) Looking at the JavaDoc I couldn't see it there, but it may be my fault. Further search in the forums lead me to nowhere.

Actually I'll be splitting the geometry among the nodes and then i'll compose the rendered images together. These are the steps of a distribution method called Sort-Last. The "viewport splitting" method is called Sort-First and it aims multi-projection systems.

Ok, I'll send you feedbacks as soon as I start coding. I'll present my monography by the end of this semester and might get the implementation started by the middle of june. Still this whole idea is subject to my advisor's opinion

Thanks for your response,
Pedro