Tutorial 03.Custom SceneNode Index order [SOLVED]

[strale]

Hello

I was traying to get through the mesh buffer vertex and index
I noticed that in the example 03.Custom SceneNode

if i modify
u16 indices[] = { 0,2,3,....
into
u16 indices[] = { 0,3,2,.......

a face of the shape dissapear
i use openGL c)option with Linux

is this correct?
May be i have misunderstand the index functionality?
could it be an error of my openGL?

Thank you

Code: Select all

virtual void render()
	{
               //OK  u16 indices[] = {	0,2,3, 2,1,3, 1,0,3, 2,0,1	}; 
		u16 indices[] = {	0,3,2, 2,1,3, 1,0,3, 2,0,1	};

		video::IVideoDriver* driver = SceneManager->getVideoDriver();
		driver->setMaterial(Material);
		driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
		driver->drawIndexedTriangleList(&Vertices[0], 4, &indices[0], 4);
	}

[Eigen]

If you reverse the index order, you're basically flipping the triangle, so the normal points down instead. Try disabling back face culling and you should be able to see it again.

[strale]

It works!

SolidNode->setMaterialFlag(video::EMF_BACK_FACE_CULLING, false);

Thankyou

[Eigen]

Bare in mind that disabling back face culling can lower your performance, depending on many triangles there are. So it's better to face all triangles the right way and enable back face culling.

[strale]

now that' s becoming clearer
Thanks