Print Page - VBO lighting problem (without lighting beeing activated)

Title: VBO lighting problem (without lighting beeing activated)
Post by: BionicWave on January 20, 2014, 19:34:43

I use a vbo to render some textured quads.
Everything works fine, but the quads are strangely illuminated. Alltough i do NOT have lighting enabled.

The result looks like this:

(http://www.trick7.de/lightingproblem.png)

The first 2 quads where drawn with direct-mode, just to show the difference and that direct-mode has no lighting problem.

This is the create-code for the vbo:

Code Select


        buffer = BufferUtils.createIntBuffer(1);
        GL15.glGenBuffers(buffer);
        vboId = buffer.get(0);
        blocksize = 48;

        vArray = new float[objects.size() * blocksize];
        int i = 0;
        for(Block b:objects){
            System.arraycopy(b.getDataT(),0,vArray,i, blocksize);
            i += blocksize;
        }
        vData = BufferUtils.createFloatBuffer(vArray.length);
        vData.put(vArray);
        vData.rewind();

        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboId);
        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, vData, GL15.GL_STATIC_DRAW);

This is the rendercode for the vbo:

Code Select


        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboId);
        glVertexPointer(3, GL_FLOAT, blocksize, 0);
        glColorPointer(4, GL_FLOAT, blocksize, 16);
        glTexCoordPointer(2, GL_FLOAT, blocksize, 28);
        glNormalPointer(GL_FLOAT, blocksize, 36);
        glDrawArrays(GL_QUADS, 0, vArray.length / 4);

Do i miss something. I changed so many parameters and shifted data, but nothing changes the outcome.
I dont know where to search.
Does anybody have a clue to where to begin with?

Many thanks to you.

Title: Re: VBO lighting problem (without lighting beeing activated)
Post by: Fool Running on January 21, 2014, 13:59:32

This looks wrong to me:

Code Select

        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboId);
        glVertexPointer(3, GL_FLOAT, blocksize, 0);
        glColorPointer(4, GL_FLOAT, blocksize, 16);
        glTexCoordPointer(2, GL_FLOAT, blocksize, 28);
        glNormalPointer(GL_FLOAT, blocksize, 36);

The size of a float is 4 bytes, so I think the color should start at 12, not at 16.
I think the code should be:

Code Select

        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboId);
        glVertexPointer(3, GL_FLOAT, blocksize, 0);
        glColorPointer(4, GL_FLOAT, blocksize, 12);
        glTexCoordPointer(2, GL_FLOAT, blocksize, 28);
        glNormalPointer(GL_FLOAT, blocksize, 36);

Title: Re: VBO lighting problem (without lighting beeing activated)
Post by: BionicWave on January 21, 2014, 18:34:03

:o
O.M.G

I can not believe i havenÂ´t seen that.
I have a copy of the project, only difference is that the buffer has no normals added. Certainly the value there is 12.
Oh man. Why did i put the 16 there.

Thanks a lot.

Title: Re: VBO lighting problem (without lighting beeing activated)
Post by: Cornix on January 21, 2014, 18:51:56

I personally would stick with 4 elements for position, texcoords and color. My own tests have shown me that the performance does actually improve when all components have 4 elements instead of trying to use the minimal number. Sure this might not be the case on all hardware, but it makes programming easier as well.

LWJGL Forum

Programming => OpenGL => Topic started by: BionicWave on January 20, 2014, 19:34:43