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[GMacD]

I saw a lovely screenshot on twitter.

Anyone know of a shader which would do something like this?

I'm thinking of a technical drawing style - thin, sharp lines for outlines (of flat multi-triangle polygons - not triangles), otherwise flat shaded.

A bit like Sketchup I guess.

Thanks!

[Netsu]

This topic might be a great place to ask

http://forums.tigsource.com/index.php?topic=37314.400

[GMacD]

This topic might be a great place to ask

http://forums.tigsource.com/index.php?topic=37314.400

You know, I think you might be onto something...

[Columbo]

You could look into edge detection shaders, perhaps?

[Fallsburg]

Even better, he wrote some blog posts about it.

[Thomas Hiatt]

A method that should work perfectly for all edges would be to use a geometry shader and generate the black edges based on triangle adjacency info. You can check the normal of the current triangle and the normal of the adjacent triangles and draw the outlines if they are different. I think this would probably be a lot slower than using edge detection algorithms but I am not sure. If you are going for flat shading and fairly low triangle counts then performance probably wouldn't matter too much.

This tutorial is a good starting point, just disregard the light and output edges based on the normals of the triangles.

[GMacD]

A method that should work perfectly for all edges would be to use a geometry shader and generate the black edges based on triangle adjacency info. You can check the normal of the current triangle and the normal of the adjacent triangles and draw the outlines if they are different. I think this would probably be a lot slower than using edge detection algorithms but I am not sure. If you are going for flat shading and fairly low triangle counts then performance probably wouldn't matter too much.

This tutorial is a good starting point, just disregard the light and output edges based on the normals of the triangles.

That's a couple of options I've got now - thanks!