Draw sharp edges

[Nico]

Hi...

Do you know any program with source code that allows drawing sharp edges please?

Many thanks

[Rob The Bloke]

Are you talking about hard/soft edges on polygonal models? where the normal vectors are either set to give a flat shaded effect, or cacluated as averages between faces to give a smooth shaded effect?

[Nico]

Yes... but instead of controlling the shading... I'd like to draw the edges shared by two faces which angle between them is superior to an threshold... any example?

[Nico]

Yes... but instead of controlling the shading... I'd like to draw the edges shared by two faces which angle between them is superior to a threshold... any example?