draw3DTrianglecolor won't work

[dehseth]

Hi everybody,
I would like to draw a 3d rectangle, so I created a class

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class CQuadrangleSceneNode : public scene::ISceneNode

and this is the render function:

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void CQuadrangleSceneNode::render()
{
    video::IVideoDriver* driver = SceneManager->getVideoDriver();
 
    driver->setMaterial(getMaterial(0));
        driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
    driver->draw3DTriangle(m_triangles[0], SColor(200,0,52,250));
    driver->draw3DTriangle(m_triangles[1], SColor(200,200,5,50));
}

I tried to remove material, set some material, texture and bla bla but I just cannot make draw3DTriangle function to make it draw the triangles by given SColor. Any idea what am I doing wrong? And I would like to use alpha too.. Thanks!

[Marthog]

Look at the class CBillboardSceneNode in the Irrlicht source. It draws a squad which turns automatically to the viewer.
Just copy the code and remove the tranformation update.

[dehseth]

no use of CBillboardSceneNode. so nobody knows why colorful triangles wont work?

[Mel]

There are better ways to draw a rectangle than using 2 draw3Dtriangle calls. Using a single drawVertexPrimitiveList is twice faster because it draws 2 triangles in a single call. Instead of 2 triangles, it is better to use 4 vertices and 6 indices

[dehseth]

Hi Mel,
you seem to misunderstood the question. It's not about performance, it is about drawing 3d triangle function color does not work. Anyways I solved the problem yesterday this is what I needed to set as material during render function:

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video::IVideoDriver* driver = SceneManager->getVideoDriver();
 
SMaterial m;
m.ColorMaterial = ECM_AMBIENT;
driver->setMaterial(m);
 
driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
driver->draw3DTriangle(m_triangles[0], color1);
driver->draw3DTriangle(m_triangles[1], color2);