Challenge: "cube scene node" properly colored

[Rulatir]

How do I assign solid red color to node returned by addCubeSceneNode? Here is what surprisingly fails:

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node->setMaterialFlag(EMF_LIGHTING, false);
node->getMaterial(0).DiffuseColor.set(255,255,0,0);
node->getMaterial(0).AmbientColor.set(255,255,0,0);
node->getMaterial(0).SpecularColor.set(255,255,0,0);

The result is completely white cube.

[CuteAlien]

I don't think you can use the material for coloring without texture and without lighting. With lighting you can set the emissive-color to guarantee a red color.

I think it should work by setting the color of the vertices directly, but I haven't tried and missing the time at the moment to write an example. Checkout S3DVertex - you can get that from the Meshbuffer, I'm sure you figure it out somehow :-)

[Rulatir]

Checkout S3DVertex - you can get that from the Meshbuffer, I'm sure you figure it out somehow :-)

No, I cannot get S3DVertex from meshbuffer because no documented method of IMeshBuffer returns S3DVertex or array thereof. What do I do with the void* returned by getVertices()? Static_cast it to S3DVertex? If there is only one S3DVertex that covers all vertex types then why doesn't IMeshBuffer::getVertices just return S3DVertex* in the first place?

edit: Oh yes, there's are also S3DVertex2TCoords and S3DVertexTangents, so:

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switch(meshBuf->getVertexType()) {

case EVT_STANDARD: {

    S3DVertex* begin=static_cast<S3DVertex*>(meshBuf->getVertices());
    S3DVertex* end = begin + meshBuf->getVertexCount();

    //... code

    break;
}

case EVT_2TCOORDS: {

    S3DVertex2TCoords* begin=static_cast<S3DVertex2TCoords*>(meshBuf->getVertices());
    S3DVertex2TCoords* end = begin + meshBuf->getVertexCount();

    //... exact same code

    break;
}

case EVT_TANGENTS: {

    S3DVertexTangents* begin=static_cast<S3DVertexTangents*>(meshBuf->getVertices());
    S3DVertexTangents* end = begin + meshBuf->getVertexCount();

    //... exact same code yet again

    break;
}
}

... because I cannot KNOW that addCubeSceneNode returns a mesh with S3DVertex vertices. It is not documented.

Just... wonderful.

[Reiko]

Perhaps getVertex() and getVertexCount() ?

edit: oops, thats on SSkinMeshBuffer

[CuteAlien]

You can find out which type it has with getVertexType () and the clean solution is checking that and then casting to the corresponding type. But in the case of the cube it will be an video::S3DVertex unless you changed it yourself, so yes, you can static_cast to that.

[Rulatir]

You can find out which type it has with getVertexType () and the clean solution is checking that and then casting to the corresponding type.

Your response and my edit collided mid-air. Still, even if I know the vertex type for the "cube scene node", handling more general cases would require the nasty boilerplate :(

[CuteAlien]

I just checked and I think in your case it might be possible to avoid the boilerplate code. All vertex types are derived from S3DVertex and you can get the size of the vertex-type with getVertexPitchFromType.

[Rulatir]

I just checked and I think in your case it might be possible to avoid the boilerplate code. All vertex types are derived from S3DVertex and you can get the size of the vertex-type with getVertexPitchFromType.

Like this?

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S3DVertex* v = (S3DVertex*)(buf->getVertices());
E_VERTEX_TYPE vtype = buf->getVertexType();
u32 pitch = v->getVertexPitchFromType(vtype);

S3DVertex* vEnd = (S3DVertex*)((char*)v+pitch*buf->getVertexCount());

while(v < vEnd) {

    //... code

    v = (S3DVertex*)((char*)v+pitch);
}

:shock: :shock: :shock:

[hybrid]

MeshManipulator->setVertexColor(cubeMesh, SColor(255,255,0,0));
But the color settings of the material would also work if lighting is enabled.

[BlindSide]

Btw, you can obtain the mesh manipulator using sceneManager->getMeshManipulator().

But I don't know why you want to go the vertex route, I think that you can just set diffuse color and specular color to black, enable lighting, and set emissive to the one that you need, this should satisfy all cases.

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node->setMaterialFlag(EMF_LIGHTING, true);
node->getMaterial(0).DiffuseColor.set(0,0,0,0);
node->getMaterial(0).AmbientColor.set(0,0,0,0);
node->getMaterial(0).SpecularColor.set(0,0,0,0);
node->getMaterial(0).EmissiveColor.set(255,255,0,0);

Should work.