Rendering just part of the texture

Troubleshooting graphics
1

Hi,



I was searching this forum for answer but I was not able to find any:-(



Is there a way how to render just part of the loaded texture?

E.g. I load texture of size 100x100, but I would like to render only viewport of it - let's say from [25, 25] to [75,75]. Is that possible??

Right now I'm able to move the texture at [25,25] with texture.getTranslation().set(0.25f, 0.25f, 0);

But this is not enough - I need also to restrict the end point [75,75].



Thanks for answer

2

you can get the TextureCoordinates from a Geometry and set them to 0.25 and 0.75 instead of 0 and 1. This would result in what you want i guess.

3

You can do this two ways, by changing the texture coordinates of your object, or by a combination or translation and "zoom" (getScale/setScale) of your texture.

4

Thanks guys,



that's exactly what I needed.

5

Maybe this example helps you.



      //Quad
        Quad q = new Quad("quad", 100, 200);
        q.setLocalTranslation(100, 0, 0);
        q.setModelBound(new BoundingBox());
        ArrayList<TexCoords> tc = q.getTextureCoords();
        FloatBuffer fb;
        for(int i=0;i<tc.size();i++){
           fb=tc.get(i).coords;
           System.err.println("Coords :");
           fb.flip();
           while(fb.hasRemaining()){
              System.err.println(fb.get());
           }
        }
        FloatBuffer fbm=BufferUtils.createFloatBuffer(8);
        fbm.put(0f);
        fbm.put(0.5f);
        fbm.put(0f);
        fbm.put(0f);
        fbm.put(0.5f);
        fbm.put(0f);
        fbm.put(0.5f);
        fbm.put(0.5f);
        TexCoords tcm=new TexCoords(fbm);
        q.setTextureCoords(tcm);
       
        tc = q.getTextureCoords();
        for(int i=0;i<tc.size();i++){
           fb=tc.get(i).coords;
           System.err.println("Coords :");
           fb.flip();
           while(fb.hasRemaining()){
              System.err.println(fb.get());
           }
        }
       
        q.setRenderQueueMode(Renderer.QUEUE_ORTHO);
        q.updateRenderState();
        n.attachChild(q);