Hi Scout,
Outside (front) is defined by triangle index order, anticlocwise as viewed from the front (2D) or from outside for a 3D shape. Backface is therefore when viewed with clockwise triangle indices.
To view the backface of a 3D object you must be inside looking out. Viewing from the other side is still looking at the outside faces, just from a different direction.
Above is a cube, with inside coloured blue, to get inside you need to mouse wheel back.
Harder to position inside your tube, but its there for me when viewed from inside it.
Outside (front) is defined by triangle index order, anticlocwise as viewed from the front (2D) or from outside for a 3D shape. Backface is therefore when viewed with clockwise triangle indices.
To view the backface of a 3D object you must be inside looking out. Viewing from the other side is still looking at the outside faces, just from a different direction.
Code:
view3D = LD3DView.AddView(GraphicsWindow.Width,GraphicsWindow.Height,"True")
LD3DView.AutoControl("True","True",2,1)
LD3DView.AddDirectionalLight(view3D,"White",-0.612372,-0.5,-0.612372)
LD3DView.AddDirectionalLight(view3D,"White",0.612372,-0.5,-0.612372)
cube = LD3DView.AddCube(view3D,1,"Red","D")
LD3DView.AddBackImage(view3D,cube,"","Blue","D")
LD3DView.AnimateRotation(view3D,cube,1,0,0,0,360,5,-1)Above is a cube, with inside coloured blue, to get inside you need to mouse wheel back.
Harder to position inside your tube, but its there for me when viewed from inside it.
![[-]](https://litdev.uk/mybb/images/collapse.png)