Hello,

I am trying to test bliting to an existing texture. I know, there is a warning sign don't do it, but I wanted to test it and I found a strange behaviour:

I have the renderer's function onSurfaceChange, creating the world and it's objects. In this function, I create 2 frame buffers, one for the standard rendering and one for the rendering into the texture. BUT once I make a second FrameBuffer with the same GL10 the screen shrinks to the size of the new frame buffer no matter what. So, I should maybe call different GL10? Or how can I create more independent FrameBuffers?

FrameBuffer fb;
FrameBuffer toTex;

public void onSurfaceChanged(GL10 gl, int w, int h) {
fb = new FrameBuffer(gl, w, h);
toTex = new FrameBuffer(gl, 256, 256);
...
}

public void onDrawFrame(GL10 gl) {
...
fb.display;
}

And to the larger problem, I would like to blit a text to a texture. I see here 4 ways:
1) blit to screen every frame: Too slow and can't skew the text.
2) create an object with 2 Triangle Sprite for every letter: Fine, but creates a complex Object3D
3) blit to bitmap using Canvas and replace texture in TextureManager: Unrecomended since texture replace(== upload a new texture to GPU), Canvas and Bitmap object is (i expect) much slower than Texture and FrameBuffer operations.
4) blit directly to texture using FrameBuffer.setRenderTarget(): This is unrecomended in the documentation by Egon but I don't know why.

So my question to the larger problem is: Why is the 4th approach not recomended since from this point of view it is probably the fastest one. (For a text which will not change every frame) And what would you pick and why?

Thanks for all advices.

Hello,

I am experimenting with this extremly helpful piece of code, but up until now I had only little luck.
1) I copied the classes GLFont and TexturePack from the first post
2) I solved the class dependency of java.awt by adding Project->Properties->Java Build Path->Add Library->JRE System library

But I am still getting two errors in the TexturePack:
the constructor jpct.Texture(BufferedImage(image), Boolean(useAlpha)) is undefined
the function com.threed.jpct.FrameBuffer.blit is not defined for parameters ...

I expect that this can have something to do with your information from the first post that you used the experimental jpct... but
1) That was 7 years ago
2) Your link for the experimental beta jpct doesn't work any more

So I am intrigued to know - is the "experimental" jpct version of blit and Texture now reachable somewhere else? or did you reprogrammed it for the classic jpct_ae? Or how can I solve this code now in 2016?

Thanks,
Darai.

By copying the object (Object3D newOne = original.cloneObject()  and it was a simple 2-triangle square.

After that, I am just adding it to the world and building it:
world.addObject(newOne);
newOne.build(false);

But you know what? It stopped... It was yelling that error on me for the whole yesterday and when I reinstalled the game today it is not doing that any more.

Hmm... I came here for your help, because this was a new error for me after I used the same method for introducing new objects into the world over and over again for the last year without any problems. I probably did something differently and just didn't realize the moment I fixed that. It is little bit funky. Since I am using xml files saved in the asset directory I have to sometimes fully uninstall the app from the device and install it again to apply the changes, so maybe the problem was somewhere there in the assets.

If it will return, I'll study it more. But thanks, if you will have any clue, what I could do wrong I would appreciate your hint.

Hi guys,

I am now writing my code for some time and suddenly I am getting "Error: Couldn't build() ..."

It writes me, that I should check if I have:
1) the object assigned to a world ... which I solve by calling world.addObject(object) right on the previous line
2) if the TextureManager has all the necesary textures loaded ... which I check by calling TextureManager.getInstance().getTextureID(this.texName)

Well I don't know if that is all I can do to check what is wrong. I also don't know if this is all that can cause this error. So, do you have any suggestions what to do next in situation like this?

Thanks,
Martin.

Thanks,

I tried to find relevant topics, but had no luck yet... since now I know it is here somewhere I'll try again and more thoroughly.

Don't worry,

it will work, just use the setTexture method of the Object3D object (Or any other retexturing method).

What you need to know is:

• Use Object3D.build(false) instead of Object3D.build() to tell JPCT that you DONT want static texture
  
• Use Object3D.touch() to tell the object that you changed something and he should do again the "lazy transformation".
  
• The texture setting is done through "Polygon manager" in following fashion: Object3D.getPolygonManager().setPolygonTexture(TriaID, new TextureInfo(TexID, U1, V1, U2, V2, U3, V3) Where TriaID is the ID of triangle on which you want to change the texture, TexID is the ID of your texture (still the same if you don't want to change the whole thing) and U1 .. V3 are coordinates of the points of the triangle on the texture (U1 - V3 are in range 0 - 1)