[Open GL] Multitexture blending

[serengeor]

I have been trying to fix this for hours, but I don't even have a clue what is wrong with it.

What I get now is this:


The code used to render the mesh:

Code: Select all

glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_NORMAL_ARRAY);
 
 
    glNormalPointer(GL_FLOAT, sizeof(Vertex3d), &_vertices[0].normal);
 
    glColorPointer(3, GL_UNSIGNED_BYTE, sizeof(Vertex3d), &_vertices[0].color.color[0]);
 
    glVertexPointer(3, GL_FLOAT, sizeof(Vertex3d), &_vertices[0].position);
 
    glDrawElements(GL_TRIANGLES, index_count, GL_UNSIGNED_SHORT, &_indexes[0]);
 
    glDisableClientState(GL_COLOR_ARRAY);
        glDisableClientState(GL_VERTEX_ARRAY);
        glDisableClientState(GL_NORMAL_ARRAY);

I'd appreciate any hints.

[mongoose7]

Err, color[0] is opacity? Maybe you should use &color[1]?

[serengeor]

Err, color[0] is opacity? Maybe you should use &color[1]?

no, it is RGBA.
The problem is that only those vertices that you see in yellow are affected by light (yellow ambient and diffuse light), others stay back no mater where i move the light.
Any more ideas?

[hendu]

Maybe the vertex colors just are that wacky?

[serengeor]

Maybe the vertex colors just are that wacky?

they are all set to 0,0,0,255 (not using the ones loaded right now).

[booe]

OH MY GOD! Sheep-cutie is still here!


@topic - has sheepie tried disabling vertex colors? How mesh looks with opengl lighting turned off? Are normals OK ?

[booe]

Maybe the vertex colors just are that wacky?

they are all set to 0,0,0,255 (not using the ones loaded right now).

Code: Select all

glColorPointer(3, GL_UNSIGNED_BYTE, sizeof(Vertex3d), &_vertices[0].color.color[0]);
 

WOOOOOOHOOOOOOOO!
You're passing number three as first argument, which means "RGB", not "RGBA"!
Have you tried to change '3' to '4' ?

What's the layout of your Vertex3d::color, huh?

[serengeor]

OH MY GOD! Sheep-cutie is still here!


@topic - has sheepie tried disabling vertex colors? How mesh looks with opengl lighting turned off? Are normals OK ?

disabling vertex colors results in (same as if I would just set them to white color) whole mesh being yellow and the same vertices as before are being only affected by light.


I'm unsure about the normals, they are loaded as the whole mesh with assimp.

[serengeor]

WOOOOOOHOOOOOOOO!
You're passing number three as first argument, which means "RGB", not "RGBA"!
Have you tried to change '3' to '4' ?

What's the layout of your Vertex3d::color, huh?

Nothing changes if i use 4 or 3. (since it is RGBA and RGB).
The color is:

Code: Select all

boost::uint8_t color[4];

I'm pretty sure that color is not the problem as it is displayed correctly without lighting.

I'm trying to implement normal drawer right now to see how the normals look, but I'm having a bit of trouble.

EDIT: Made to draw them:


Drawing code:

Code: Select all

 
void COpenGLRenderer::renderMeshNormals(IMeshBuffer * buffer)
{
    if(m_currentMaterial->getFlag(EMRF_LIGHTING)) glDisable(GL_LIGHTING);
 
    VertexArray lines;
    IndexArray indexes;
    for (boost::uint16_t i = 0; i<buffer->getVertexCount(); i++)
    {
        lines.push_back(buffer->getVertices()[i].position);
        lines.push_back(buffer->getVertices()[i].position+buffer->getVertices()[i].normal);
 
        indexes.push_back(indexes.size());
        indexes.push_back(indexes.size());
 
    }
 
    glEnableClientState(GL_VERTEX_ARRAY);
 
    glVertexPointer(3, GL_FLOAT, sizeof(Vertex3d), &lines.data()[0].position[0]);
    glDrawElements(GL_LINES, indexes.size(), GL_UNSIGNED_SHORT, &indexes.data()[0]);
 
    glDisableClientState(GL_VERTEX_ARRAY);
    
    if(m_currentMaterial->getFlag(EMRF_LIGHTING)) glEnable(GL_LIGHTING);
 
}

[ent1ty]

Well, to cheer you up, I think it looks real good. You just put some ghosts into your game and tell everyone it's supposed to be like this. And use lightmapped textures for level geometry instead of dynamic lighting.

[serengeor]

Well, to cheer you up, I think it looks real good. You just put some ghosts into your game and tell everyone it's supposed to be like this. And use lightmapped textures for level geometry instead of dynamic lighting.

Heh, could do that if I was building a game right now.
But I'm doing my little rendering engine and I need to fix the strange normals somehow. I certainly wouldn't use these lights in game.

[Cube_]

that is one really cool screenshot. mind if I borrow the code?

[ent1ty]

uhm... you just set all the vertex normals to [0,|1|,0] and you're good to go

[serengeor]

that is one really cool screenshot. mind if I borrow the code?

Sure.

uhm... you just set all the vertex normals to [0,|1|,0] and you're good to go

Tried that and all I can say is that something really weird going on in my code :/
If I load the blender monkey I can't even see the normals though the head renders ok.

[serengeor]

After hours of wall meats head, I finally managed to fix. And the problem was normals.. I forgot to copy over normal data in Vertex3d constructor

Here's a screenie of working (probably correctly ) ligth:

PS. triangle indicates light position.

Thank you all for your responses