Environment mapping

[Bonbon-Chan]

Hi,

I would like to do some environment mapping on a mesh. I found articles speaking about it but I'm lost right now.
Bascily, I want to use 1 2D textures to make reflexion (metal/glass material feeling). There is functions to generate Texture Coords but I don't really know whish on to use.
- GL_SPHERE_MAP seems to don't seem to work well but and it don't rotate with the view
- GL_EYE_LINEAR seems to be the one to be used but I don't manage to work with it

(It is my 3D engine, I'm making it for learning propose)

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GL11.glPushMatrix(); GL11.glMultMatrix(view.getFloatBuffer());         GL11.glEnable(GL11.GL_BLEND);       GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);       GL11.glDisable(GL11.GL_COLOR_MATERIAL);       GL11.glColor4f(1, 1, 1,environmentMapping);       GL11.glEnable(GL11.GL_TEXTURE_2D);       mesh.getWorld().getEnvironmentMapping().bind();             GL11.glTexGeni(GL11.GL_S, GL11.GL_TEXTURE_GEN_MODE, GL11.GL_SPHERE_MAP);       GL11.glTexGeni(GL11.GL_T, GL11.GL_TEXTURE_GEN_MODE, GL11.GL_SPHERE_MAP);       GL11.glEnable(GL11.GL_TEXTURE_GEN_S);       GL11.glEnable(GL11.GL_TEXTURE_GEN_T);               GL11.glEnableClientState(GL11.GL_VERTEX_ARRAY);         GL11.glVertexPointer(3, 0, model.getVertices());                 GL11.glEnableClientState(GL11.GL_NORMAL_ARRAY);         GL11.glNormalPointer(3,model.getNormales());             GL11.glDrawElements(GL11.GL_TRIANGLES, model.getIndexes());             GL11.glDisableClientState(GL11.GL_NORMAL_ARRAY);         GL11.glDisableClientState(GL11.GL_VERTEX_ARRAY);       GL11.glDisable(GL11.GL_TEXTURE_GEN_S);       GL11.glDisable(GL11.GL_TEXTURE_GEN_T);           GL11.glPopMatrix();

[Bonbon-Chan]

I found an example using GL_SPHERE_MAP in LWJGL (Nehe lesson 26). It was using glBegin / glEnd.
So I remove glDrawElements for glBegin / glEnd then GL_SPHERE_MAP works...

I don't get why it doesn't work with glDrawElements   

[Bonbon-Chan]

Some more elements :
- tested on another machine same result (so it is not a driver problem)
- nothing in the opengl reference for GL_SPHERE_MAP... can't find anything on this problem right now 

No one is using environment map ?

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[h3ckboy]

hehe, this is probably gunna end up like teh generator thing b4.

you are gunna be like "ahh I was bored of waiting, so I jsut figured it out :/" lol

[EgonOlsen]

What exactly is the problem, i.e. what is the visual outcome of your code? I'm using environment mapping in a very similar way, your code looks fine to me at first glance....does the call to bind() binds the texture?

Edit: Looking a bit closer...are you sure that this line:

1	GL11.glNormalPointer(3,model.getNormales());

is correct? A stride of 3 looks suspicious to me. Try 0 or 12 instead, if your normals are stored one after the other without gaps.

[Bonbon-Chan]

Edit: Looking a bit closer...are you sure that this line:

1	GL11.glNormalPointer(3,model.getNormales());

is correct? A stride of 3 looks suspicious to me. Try 0 or 12 instead, if your normals are stored one after the other without gaps.

... no... no I could'nt...
[size=20pt]DOH ![/size]

I was pretty sure that was a stupid error... Thanks a lot Egon 

[Bonbon-Chan]

Ok, it works with SPHERE_MAP. Now I'm going for REFLECTION_MAP with CubeMap (first time I use cube map  ).
And of course, I have a problem 

If I don't enable GL_TEXTURE_CUBE_MAP, I got (it seems allright  to me) :


But when I enable GL_TEXTURE_CUBE_MAP, the teapot is all white.

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GL11.glEnable(GL11.GL_BLEND);       GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);       //GL11.glDisable(GL11.GL_COLOR_MATERIAL);      GL11.glColor4f(1, 1, 1,environmentMapping);       //GL11.glEnable(GL11.GL_TEXTURE_2D);             GL11.glMatrixMode(GL11.GL_TEXTURE);       GL11.glPushMatrix();       GL11.glMultMatrix(camera.getTrans().getFloatBuffer());             GL11.glEnable(GL13.GL_TEXTURE_CUBE_MAP);                   GL11.glEnable(GL11.GL_NORMALIZE);             GL11.glEnable(GL11.GL_TEXTURE_GEN_S);       GL11.glEnable(GL11.GL_TEXTURE_GEN_T);       GL11.glEnable(GL11.GL_TEXTURE_GEN_R);             GL11.glTexGeni(GL11.GL_S, GL11.GL_TEXTURE_GEN_MODE,GL13.GL_REFLECTION_MAP);       GL11.glTexGeni(GL11.GL_T, GL11.GL_TEXTURE_GEN_MODE,GL13.GL_REFLECTION_MAP);       GL11.glTexGeni(GL11.GL_R, GL11.GL_TEXTURE_GEN_MODE,GL13.GL_REFLECTION_MAP);             mesh.pass(false,true);                   GL11.glDisable(GL11.GL_TEXTURE_GEN_S);       GL11.glDisable(GL11.GL_TEXTURE_GEN_T);       GL11.glDisable(GL11.GL_TEXTURE_GEN_R);             GL11.glDisable(GL11.GL_NORMALIZE);             GL11.glDisable(GL13.GL_TEXTURE_CUBE_MAP);             GL11.glPopMatrix();       GL11.glMatrixMode(GL11.GL_MODELVIEW);

This code seems good for me, so it must be an error in setting up the cube map.

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public void create()     {       GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);               IntBuffer scratch = BufferUtils.createIntBuffer(1);       GL11.glGenTextures(scratch);           int error = GL11.glGetError();       if( error != GL11.GL_NO_ERROR)       {         System.out.println("Texture.create : error OpenGL ("+error+")");       }             handle = scratch.get(0);             System.out.println("Creating cube map : "+handle);     } public void bind()     {         GL11.glBindTexture(GL13.GL_TEXTURE_CUBE_MAP, handle);         lastBind = handle;               System.out.println("Binding cube map : "+lastBind);     } public void setImages(BufferedImage positiveX,BufferedImage negativeX,                           BufferedImage positiveY,BufferedImage negativeY,                           BufferedImage positiveZ,BufferedImage negativeZ)     {       bind();               GL11.glTexEnvf(GL11.GL_TEXTURE_ENV, GL11.GL_TEXTURE_ENV_MODE, GL11.GL_REPLACE);             setImage(GL13.GL_TEXTURE_CUBE_MAP_POSITIVE_X,positiveX);       setImage(GL13.GL_TEXTURE_CUBE_MAP_NEGATIVE_X,negativeX);       setImage(GL13.GL_TEXTURE_CUBE_MAP_POSITIVE_Y,positiveY);       setImage(GL13.GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,negativeY);       setImage(GL13.GL_TEXTURE_CUBE_MAP_POSITIVE_Z,positiveZ);       setImage(GL13.GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,negativeZ);     } public void setImage(int place, int width, int height, int type, IntBuffer imageData)     {           System.out.println(lastBind+"Setting image to "+place+" (type :"+type+")");               GL11.glTexImage2D(place, 0, GL11.GL_RGBA, width, height,                         0, type, GL11.GL_UNSIGNED_BYTE, imageData);         int error = GL11.glGetError();       if( error != GL11.GL_NO_ERROR)       {         System.out.println("Texture.setImage : error OpenGL ("+error+")");       }     } public void setImage(int place,BufferedImage img)     {       // System.out.println("IMAGE : opaque("+img.getTransparency()+") type("+img.getType()+")");               if(img.getTransparency() == Transparency.OPAQUE)       {         if ((img.getType() == BufferedImage.TYPE_BYTE_BINARY)||(img.getType() == BufferedImage.TYPE_BYTE_INDEXED))         {           BufferedImage img2 = new BufferedImage(img.getWidth(),img.getHeight(),BufferedImage.TYPE_3BYTE_BGR);           Graphics g = img2.getGraphics();           g.drawImage(img, 0, 0, null);           g.dispose();           setImage(place,img2);         }         else         {           ByteBuffer imageData = ByteBuffer.allocateDirect(3 * img.getWidth() * img.getHeight());           byte data[] = (byte[]) img.getRaster().getDataElements(0, 0, img.getWidth(), img.getHeight(), null);           imageData.put(data);           imageData.flip();                   setImage(place,img.getWidth(),img.getHeight(),RGB,imageData);         }       }       else       {         if ((img.getType() == BufferedImage.TYPE_BYTE_BINARY)||(img.getType() == BufferedImage.TYPE_BYTE_INDEXED))         {           BufferedImage img2 = new BufferedImage(img.getWidth(),img.getHeight(),BufferedImage.TYPE_INT_ARGB);           Graphics g = img2.getGraphics();           g.drawImage(img, 0, 0, null);           g.dispose();           setImage(place,img2);         }         else if (img.getType() == BufferedImage.TYPE_INT_ARGB )         {           IntBuffer imageData = Util.IntBuffer(img.getWidth() * img.getHeight());           int data[] = (int[]) img.getRaster().getDataElements(0, 0, img.getWidth(), img.getHeight(), null);           imageData.put(data);           imageData.flip();                   setImage(place,img.getWidth(),img.getHeight(),RGBA,imageData);         }         else         {           ByteBuffer imageData = ByteBuffer.allocateDirect(4 * img.getWidth() * img.getHeight());           byte data[] = (byte[]) img.getRaster().getDataElements(0, 0, img.getWidth(), img.getHeight(), null);           imageData.put(data);           imageData.flip();                   setImage(place,img.getWidth(),img.getHeight(),RGBA,imageData);         }       }     }

And it give me in the console :

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Creating cube map : 8 Binding cube map : 8 8Setting image to 34069 (type :6407) 8Setting image to 34070 (type :6407) 8Setting image to 34071 (type :6407) 8Setting image to 34072 (type :6407) 8Setting image to 34073 (type :6407) 8Setting image to 34074 (type :6407)

So it seems good too 
Any advices to how to debug that ?

[Bonbon-Chan]

Sorry...

I miss a GL_TEXTURE_2D in GL11.glTexParameteri(GL13.GL_TEXTURE_CUBE_MAP, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR); when I have copy&past...

Still have to make correction of my texture orientation and it is done